Not all subs are designed the same: Know the differenceAs the longest-established personal submersible manufacturing company, <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> has been setting industry benchmarks for manned submersibles since 1995. <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a>’s fleet has completed over 13,500 dives with a perfect safety record, a figure representing more dives than all other submersible manufacturers combined.<img src="https://photo-assets.superyachttimes.com/photo/345295/image/large-43dbedf90bec4055f707eea47919abae.jpg" data-gid="gid://syiq/Photo/345295">Based near Los Angeles, <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> has cultivated long-term relationships with its yacht clients, including one superyacht owner who recently returned for a third submersible. This loyalty stems from two key factors: first, <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a>’s submersibles are designed and customised to fulfil the owners’ dreams. Second, the subs’ proven reliability and performance, along with the company’s 24/7 international support, alleviate captains’ concerns, allowing the underwater vehicles to seamlessly integrate with other onboard activities.<img src="https://photo-assets.superyachttimes.com/photo/345298/image/large-ac897da29bec7318de3a789b3dc75f56.jpg" data-gid="gid://syiq/Photo/345298"><img src="https://photo-assets.superyachttimes.com/photo/345296/image/large-9c8df9296442ef13a2c01a8b5e6cf6d4.jpg" data-gid="gid://syiq/Photo/345296">Key considerations when choosing a submersible“Many yacht owners, captains and yachting professionals are unfamiliar with the distinctions between well-designed and poorly designed submersibles, as this technology comes from a different marine sector,” explains Charles Kohnen, co-founder and chairman of <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a>. “Our subs, which are sized and built specifically for yachts, prioritise design features that enhance the owner’s diving experience while ensuring ease of maintenance and operation. The difference <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a>’s design makes in terms of owner and captain satisfaction for their sub is like night and day.”<img src="https://photo-assets.superyachttimes.com/photo/345303/image/large-598549a4edbb004ff54161757da0b5bb.jpg" data-gid="gid://syiq/Photo/345303">Key considerations when choosing a submersibleThe first key factors a yacht must consider when selecting a submersible are its passenger capacity, maximum depth rating and launch weight limit. These parameters determine the sub’s size and weight, but additional considerations are equally important. One key purpose of a sub on a yacht is to provide an unforgettable underwater view for the owners. This is best achieved with a panoramic bubble design, unobstructed by a hatch on top, which can significantly block the overhead view. The difference in experience between a sub with an overhead hatch and a <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> sub is undeniable. <img src="https://photo-assets.superyachttimes.com/photo/345300/image/large-20f6c1280a4e1f538c5e92aa6b52f884.jpg" data-gid="gid://syiq/Photo/345300"><img src="https://photo-assets.superyachttimes.com/photo/345304/image/large-36bfa63a536f14e63012e67991d8ccec.jpg" data-gid="gid://syiq/Photo/345304">Anyone who has had the opportunity to dive in both will attest to this. <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> designs its submersibles with a unique rear hull section that houses the hatch, pilot station and equipment, allowing the front bubble to maintain an unobstructed panoramic view while offering passengers a more spacious interior. Space aboard a sub is premium real estate, and <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> subs offer more room within their launch weight category than any other sub on the market. This additional space allows <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> subs to include larger, more comfortable leather seats and maximised personal space for all aboard.<img src="https://photo-assets.superyachttimes.com/photo/345302/image/large-9c6bbf6d892fc382a25ff4e0dc66801e.jpg" data-gid="gid://syiq/Photo/345302">A peaceful experience below the surfaceAnother standout feature is the cabin’s quiet interior. All <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> subs are equipped with powerful propulsion thrusters that operate without gearboxes, eliminating loud noises from the motors that could startle marine life or create an annoying hum. To further enhance the tranquil atmosphere, <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> has designed a quiet air conditioning system and fans, prioritising a peaceful environment. <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a> has also optimised the boarding and disembarking process to ensure comfort while the submersible is floating on the water’s surface. The patented design features a horizontal top deck with handrails, allowing passengers to board through the rear hatch and descend a short staircase to their seats. This extra-large hatch design improves convenience and safety.<img src="https://photo-assets.superyachttimes.com/photo/345299/image/large-3254662efa38532fdf6d8042ff312964.jpg" data-gid="gid://syiq/Photo/345299">These are just a few of the distinguishing factors that contribute to an exceptional submersible. The resulting superior designs are only possible due to <a data-gid="gid://syiq/Company/4194" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SEAmagine Hydrospace Corporation (Company)">SEAmagine</a>’s experience gained over thousands of dives and nearly 30 years of dedicated submersible development.<img src="https://photo-assets.superyachttimes.com/photo/345297/image/large-2c534ffec741595a9663f43314be6afb.jpg" data-gid="gid://syiq/Photo/345297">This article was featured in&nbsp;<a href="https://www.superyachttimes.com/magazine/how-to-build-it-issue-6" rel="noopener noreferrer" target="_blank" title="">Issue 6 of How To Build It.</a>&nbsp;You can read all the articles from this edition&nbsp;<a href="https://www.superyachttimes.com/magazine/how-to-build-it-issue-6" rel="noopener noreferrer" target="_blank" title="">here</a>, and stay up-to-date with all previous editions&nbsp;<a href="https://www.superyachttimes.com/magazine" rel="noopener noreferrer" target="_blank" title="">here</a>.

How to Build it: SEAmagine on submersibles

SEAmagine submersible 

original

small

medium

large

extra_large

SEAmagine Aurora series  

SEAmagine, the longest-established personal submersible manufacturing company, discuss their submersibles, which have been around since since 1995.   

How to Build it: SEAmagine's guide to submersibles

<a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom Yacht Equipment</a>&nbsp;has earned a prominent position in the superyacht supply chain for its bespoke boarding equipment, platforms, cranes, watertight doors and integrated control systems. Yet the engineering philosophy behind its custom-designed solutions is based on a resolutely modular approach.When Mervyn van der Ploeg was appointed managing director of <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom Yacht Equipment</a> in 2015, the company was going through a bad patch. It routinely redesigned everything from scratch for each new yacht project, leading to prototype-level inefficiencies and financial strain. A small but telling example is that it used to produce 32 different types of locking pins. Today, through a process of standardisation and modularisation, that number has been reduced to just two sizes.<img src="https://photo-assets.superyachttimes.com/photo/396743/image/large-c20dda6c39f046eea94eaa71057b9e2c.jpg" data-gid="gid://syiq/Photo/396743">“Previously, when designing a platform for a yacht, four different locking pins might have been specified, requiring multiple suppliers,” explains van der Ploeg. “Now, we buy 200 locking pins per year in two sizes from a single supplier at half the cost.”The process began by redesigning a prototype passerelle from scratch using a fully modular approach, which then became a template for other equipment. While remaining a supplier of custom equipment, modular components are now reused across <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s product range, reducing design complexity and streamlining production.“A key technical insight came from looking outside the yachting industry,” continues van der Ploeg. “For example, swivel joints originally designed for excavators have been incorporated into our gangways. These components are proven, industrial-grade and standardised, which means we can build highly reliable systems without reinventing core mechanisms.”In the ten years since van der Ploeg joined the company, turnover has more than doubled from €12 million to €25 million, driven by increased efficiency along with larger yachts and a rising demand for integrated equipment.<img src="https://photo-assets.superyachttimes.com/photo/396739/image/large-d48d0f06ceeb5a00cfda9bafe1c96878.jpg" data-gid="gid://syiq/Photo/396739">Make it modularThe spin-off from <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s modular way of thinking are innovations designed to maximise open space while eliminating visual clutter. Many of these solutions revolve around relocating drive systems into hinge lines and the platform structures themselves. In one recent project, a large side platform was initially conceived as two separate elements with a manually installed infill piece. While technically feasible, it was operationally awkward. Instead, by introducing an internal hinge drive already proven elsewhere, the entire system was re-engineered as a single monolithic platform. The infill was eliminated, deployment became faster, crew workload was reduced, and the geometry became cleaner.<img src="https://photo-assets.superyachttimes.com/photo/396744/image/large-4feaec6057dc57f70fe27a2f2a88296b.jpg" data-gid="gid://syiq/Photo/396744">The Sliding Stairs Access Hatch is another example. Developed in response to a request to optimise the passage from the main deck to the beach platform on <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship’s</a> 79.5-metre <a data-gid="gid://syiq/Yacht/11677" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Valor79.5m (260'10&quot;)Feadship2025">Valor</a>, <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s engineers merged door, hatch and boarding equipment components to create a completely new solution. Essentially, the staircases on each side of the pool form the hatch itself, with half of each staircase retracting into the deckhead like a gangway to provide access to the beach club.<img src="https://photo-assets.superyachttimes.com/photo/396742/image/large-bd76338bca2c0e5436acede35e416f93.jpg" data-gid="gid://syiq/Photo/396742">“This marked a next step in modular engineering for <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>,” says van der Ploeg. “Our approach not only accelerated the development process, but also showed how modularity enables flexible, cross-disciplinary solutions without compromising quality.”As both staircases form part of the watertight boundary of the vessel certified by Class, one of the main challenges was ensuring watertight integrity, given the angle at which the stair hatches are installed, as well as aligning the treads between the hatches and the fixed structures. In fact, sealing has become a central issue as stern structures grow more complex – folding, rotating and closing at compound angles. While inflatable seals are often the go-to solution and offer excellent theoretical performance, they also represent a single point of failure. <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> typically prefers D-profile rubber seals, which wear gradually, remain locally manageable, and allow temporary mitigation.<img src="https://photo-assets.superyachttimes.com/photo/396741/image/large-cf52ffb86158af5f4ac7a5922058d9b5.jpg" data-gid="gid://syiq/Photo/396741">“This approach is especially critical for Lloyd’s-certified watertight items such as split transom doors closing at different angles, where corners and junctions between curved surfaces become critical failure points,” van der Ploeg points out.Such solutions highlight how <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> has evolved beyond developing hardware to innovating the onboard experience, a strategy that has resulted in multiple patented solutions, from pop-up gangways embedded in the stern platform to protective cabrio covers engineered to fold, stack or nest completely out of sight when not in use. At the last edition of <a data-gid="gid://syiq/Company/4374" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Metstrade (Company)">Metstrade</a>, the company presented five interactive aft deck models through immersive 3D visualisations showcasing how engineering, design and user experience increasingly converge in the early phases of yacht development.<img src="https://photo-assets.superyachttimes.com/photo/396745/image/large-b406b1bef2a73b0811b05344a273be7e.jpg" data-gid="gid://syiq/Photo/396745">Under controlAnother defining feature of <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s approach is that its control systems and programming are all developed in-house. Precise timing between electronic commands, hydraulic oil flow and mechanical motion is critical, as are programmed delays that account for inertia and mass. Most systems employ frequency-driven power packs rather than simple on/off hydraulics, resulting in smoother movement, lower noise levels and the elimination of hydraulic ‘hammer’ effects. Automated operating cycles manage sequencing, speed and end-of-stroke deceleration automatically, reducing the risk of impact damage and operator error. Before delivery, full functional testing is carried out in-house, often with owner representatives present.Enclosed helicopter lifts represent some of the most complex control systems <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> has delivered. On yachts such as the 85.95-metre <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> superyacht <a data-gid="gid://syiq/Yacht/234" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Ecstasea85.95m (281'12&quot;)Feadship2004">Ecstasea</a>, the 96.6-metre <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> superyacht <a data-gid="gid://syiq/Yacht/5936" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sophia96.6m (316'11&quot;)Feadship2017">Sophia</a> (ex-Faith), 99-metre <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> superyacht <a data-gid="gid://syiq/Yacht/2074" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Madame Gu99.0m (324'10&quot;)Feadship2013">Madame Gu</a> and the 102.6-metre <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> superyacht <a data-gid="gid://syiq/Yacht/10678" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Ulysses102.6m (336'7&quot;)Feadship2024">Ulysses</a>, these lift assemblies rely on synchronised spindles and highly precise control algorithms to ensure uniform vertical motion. Ironically, real-world usage of helicopter lifts has revealed an interesting pattern:&nbsp;<img src="https://photo-assets.superyachttimes.com/photo/396746/image/large-793a08021cda2fc7bab19c3cd8f1a821.jpeg" data-gid="gid://syiq/Photo/396746">“On some yachts, the heli hangars are no longer actively used and instead function as static storage platforms,” reveals van der Ploeg. “In such cases, owners may even suspend servicing altogether – an illustration of how operational reality can diverge from original design intent.”Developments in control systems are being matched by advances in data intelligence. During the COVID period, <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> expanded its remote-support capabilities and identified a recurring issue: when faults occur, crews often cannot describe what happened beyond “pressing the button”. To address this, its latest systems incorporate data logging that records each operating cycle, sequence order, timing, load condition and fault event with precise timestamps.“When an issue arises, engineers can trace it back to the exact operating condition that caused it,” explains van der Ploeg. “While still being rolled out primarily on new-build projects, data logging represents a shift towards evidence-based rather than purely scheduled maintenance.”Across <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s predominantly hydraulic product range, failures rarely originate in the actuators themselves. Instead, the most vulnerable areas are where forces converge – locations where multiple loads are transferred into a single structural interface. Passerelles are a prime example:“Forces are transmitted through long, slender structures back to a limited number of mounting points,” explains van der Ploeg. “When additional functionality is introduced, such as lateral slewing rather than straight-line deployment, those forces increase substantially.”<img src="https://photo-assets.superyachttimes.com/photo/396750/image/large-74a75f9786460908e4bf98d749448420.png" data-gid="gid://syiq/Photo/396750">Bonding and bolt-inSome <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> passerelles now extend up to 16-metres in length, pushing the limits of lightweight structural engineering while maintaining stiffness, safety margins and regulatory compliance. Designing these interfaces requires careful attention to geometry, material thickness and fatigue behaviour.Marine-grade aluminium remains the primary structural material, selected for its high strength-to-weight ratio and corrosion resistance. Steel is used selectively in high-load interfaces where stiffness and wear resistance are critical. Carbon fibre has also been deployed strategically, particularly in the outermost sections of passerelles. Reducing mass at the extremity lowers bending moments throughout the structure, enabling greater reach without adding reinforcements.&nbsp;A more recent addition to <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a>’s fabrication methodology is the introduction of structural adhesive bonding. In lightweight aluminium constructions, particularly passerelles, welding thin sections sometimes caused unacceptable deformation due to heat input. To address this, <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> now uses a hybrid method: components are positioned with bolts to prevent movement, while the structural adhesive provides the primary load-bearing bond. In this configuration, the bolts act purely as locators and the adhesive carries the load.Another key evolution is the move towards bolt-in housings for boarding equipment such as passerelles and swim ladders. Historically, these housings were built directly into the hull, placing installation and testing squarely on the shipyard’s critical path. This new approach uses self-contained housings that are assembled and factory-tested in-house, accepted by owners or representatives, and installed later as plug-and-play units.“Once delivered, the housing is bolted into place, hydraulics and electrics are connected, and functionality is assured – eliminating the risk of delays, rework and repainting,” says van der Ploeg.<img src="https://photo-assets.superyachttimes.com/photo/396752/image/large-1ea3884318d73cd6441f8d9cf8801f9c.jpg" data-gid="gid://syiq/Photo/396752">Breaking outSolely owned by <a data-gid="gid://syiq/Company/4951" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Koninklijke De Vries Scheepsbouw (Company)">Koninklijke De Vries,</a> until recently <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> worked exclusively within <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a>. It is now pursuing a more open strategy, with roughly 60% of turnover derived from <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> new-build projects, 25% from service and refit work on existing <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadships</a>, and the rest from other shipyards – a share that continues to grow as the company expands its marketing network.An early major non-<a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> contract was with <a data-gid="gid://syiq/Company/4644" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="AKYACHT (Company)">AKYACHT</a> in Turkey for its 120-metre-plus project (NB012) due for delivery in 2030. Another is the new <a data-gid="gid://syiq/Company/201" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="ISA Yachts (Company)">ISA</a> Custom 80 currently under construction at <a data-gid="gid://syiq/Company/201" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="ISA Yachts (Company)">ISA Yachts</a> in Ancona. The <a data-gid="gid://syiq/Company/201" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="ISA Yachts (Company)">ISA</a> client, an experienced <a data-gid="gid://syiq/Company/29" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Feadship (Company)">Feadship</a> charterer, specified <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> to supply the boarding systems with which he directly interacts – in total, five independent mechanical systems with fully integrated control logic.<img src="https://photo-assets.superyachttimes.com/photo/396754/image/large-0eae94a6e941a08764d18f82632bee1f.jpg" data-gid="gid://syiq/Photo/396754">Across all these developments, a clear evolution emerges. <a data-gid="gid://syiq/Company/5438" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Akerboom Yacht Equipment (Company)">Akerboom</a> has progressed from boatbuilder to specialist supplier, system integrator and, ultimately, lifestyle collaborator. Each project begins by asking what experience the owner, designer or shipyard wants to achieve. From there, complexity is carefully analysed and engineered so that systems are notable precisely for their absence – seeming to disappear once installed, leaving spaces that feel more open, intuitive and fully resolved.<img src="https://photo-assets.superyachttimes.com/photo/396753/image/large-24074ca4b4f597fe6f6d7ba61d16b96a.jpg" data-gid="gid://syiq/Photo/396753">

Standardising the bespoke: The engineering behind custom superyacht equipment

Akerboom Yacht Equipment explains how modular engineering is reshaping its custom superyacht boarding systems, platforms, cranes and control systems.

Project YB256 is a 45-metre steel and aluminium motor yacht under construction at <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Royal Hakvoort Shipyard</a> in the Netherlands. The first collaboration between the family-run yard and <a data-gid="gid://syiq/Company/33" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hoek Design Naval Architects B.V. (Company)">Hoek Design Naval Architects</a>, the yacht’s retro styling masks a modern and highly capable cruiser engineered for long-distance voyaging.<img src="https://photo-assets.superyachttimes.com/photo/396216/image/large-6096248c4df8137326bee068ed36838f.jpg" data-gid="gid://syiq/Photo/396216">The impossibly picturesque village of Monnickendam on the western shore of the Markermeer, a vast freshwater reservoir not far from Amsterdam, has been home to the <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Royal Hakvoort Shipyard</a> for more than a century. Wedged into a narrow strip of dockland between the old town centre and the water’s edge, space is as precious as the custom yachts it builds, but over the years the management has perfected a choreography of space and timing to ensure multiple projects can progress without tripping over one another.“<a data-gid="gid://syiq/Company/33" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hoek Design Naval Architects B.V. (Company)">Hoek Design</a> is just a few kilometres down the road and we’ve often wanted to work with them, but the stars never aligned,” affirms Klaas Hakvoort, fourth generation director of the shipyard with his brother Albert Jr. “In this case, the client wanted Dutch pedigree, was happy with our pricing, and the complexity of the project was a perfect match for a custom builder like us.”<img src="https://photo-assets.superyachttimes.com/photo/396206/image/large-71da8891dd01ddb5eed6ecc0455c82e1.jpg" data-gid="gid://syiq/Photo/396206">Project YB256 was inspired by <a data-gid="gid://syiq/Yacht/6037" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Blue II55.99m (183'8&quot;)Turquoise Yachts2020">Blue II</a>, the 56-metre expedition vessel with classic lines by <a data-gid="gid://syiq/Company/33" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hoek Design Naval Architects B.V. (Company)">Hoek Design</a> launched by <a data-gid="gid://syiq/Company/224" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Turquoise Yachts (Company)">Turquoise Yachts</a> in 2020. <a data-gid="gid://syiq/Company/33" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hoek Design Naval Architects B.V. (Company)">Hoek Design</a> partners Andre Hoek and Ruurt Meulemans translated the client’s admiration for the retro-influenced yacht into a more compact platform that would echo the same timeless elegance free of nostalgic mimicry, while embracing modern technology and efficiency. The owner’s exacting brief included full wheelchair accessibility, an elevator connecting all deck levels, and transatlantic capability.“The hull and superstructure were conceived to balance classic proportions with today’s efficient hydrodynamics,” says Ruurt Meulemans. “Computational fluid dynamics [CFD] analysis informed every curve, refining the bow shape and optimising volume distribution to reduce resistance as much as possible and improve wake flow to the twin propellers. The objective was a smooth, efficient ride across a transatlantic cruising envelope of close to 4,000 nautical miles – no small achievement for a vessel under 400 gross tons.“<img src="https://photo-assets.superyachttimes.com/photo/396218/image/large-f219694742e3fedf1f00ff2c0b5c4003.jpg" data-gid="gid://syiq/Photo/396218">Meeting these requirements called for some clever engineering based on robust, proven solutions. Finite element analysis (FEA) guided the placement of bulkheads, stringers, and the keel to ensure structural integrity under long passages without compromising interior volume. The challenge was compounded by hybrid-assisted propulsion comprising twin 1,000-hp MAN diesel engines paired with electric motors and supported by a lithium-ion battery bank.The system integrated by <a data-gid="gid://syiq/Company/3869" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Eekels Technology BV (Company)">Eekels Technology</a> allows for flexible operational modes. Electric mode provides a few hours of silent propulsion at low speed, ideal for manoeuvring in harbours or environmentally sensitive zones. In diesel mode the electric motors can function as shaft generators to reduce fuel burn on extended passages. The electric motors also add redundancy for additional peace of mind far from home. <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Royal Hakvoort</a> had direct experience of the latter: during sea trials of 61-metre <a data-gid="gid://syiq/Yacht/8621" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Asia61.0m (200'2&quot;)Royal Hakvoort Shipyard2024">Asia</a>, an electrical fault caused an engine shutdown, but the gearbox-mounted e-motors allowed the crew to manoeuvre safely away from an offshore wind farm.<img src="https://photo-assets.superyachttimes.com/photo/396210/image/large-bfbd4613c1cb6d84c9fb37fa9b5d37a0.jpg" data-gid="gid://syiq/Photo/396210">The battle for spaceA signature feature of the yacht is the continuous ribbon of wraparound glazing on the main and bridge decks – 17 tonnes of it. The bulwarks are also glass and the hull windows incorporate a dot-fade pattern that blends with the white hull from a distance. Combined with the classic sheer line and bronze-metallic funnel, the green-tinted glass adds a touch of understated elegance that hints at an era that never quite existed – but should have. The wheelhouse windows are not full-height, but the aluminium surfaces beneath will be clad with glass and the same green reflective finish to create the visual effect of uninterrupted glass.&nbsp;Extensive glazing has a downside, however: heat. Solar load becomes a critical issue, especially for a yacht destined for hot climates. One option is to increase HVAC capacity, but a smarter one is to engineer better insulation. <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Hakvoort</a> chose the latter. A two-year development programme with glass specialist Royal-Maritiem sought the ideal balance of solar control, privacy, clarity, structural strength, and colour uniformity. Each double-glazed laminated pane is filled with argon gas and coated with a low-emissivity metal film tuned to deliver the desired green tint. The result is a 50 precent reduction in heat transfer compared to conventional marine glass.<img src="https://photo-assets.superyachttimes.com/photo/396219/image/large-043a6cfbb4c2ee18f77e9eca62c4d295.jpg" data-gid="gid://syiq/Photo/396219">But heat is not the only issue. Full-height windows also eliminate the storage units and hidden cavities normally used to route ducting, wiring, and AC trunking, pushing the technical infrastructure inward. As a result, space became the defining constraint and the build team had to fight for every cubic centimetre. <a data-gid="gid://syiq/Company/33" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hoek Design Naval Architects B.V. (Company)">Hoek Design</a> has deep experience of designing sailboats where space is always at a premium, but it was up to the shipyard to find ways to integrate complex systems into tight envelopes.“Nothing fitted, so we had to make it fit,” says Klaas, which could be the unofficial motto of the project. “By the time everything is installed, the engine room will be very full, but accessible and maintainable. Not cluttered – engineered.”The electrical switchboards span the full height of the engine from port to starboard across, an unavoidable result of the hybrid system. The engine room itself relies on seawater-fed heat exchangers because there wasn’t room for conventional air-cooling systems. The pool doubles as a tender bay with a dump tank and its own dedicated crane compartment that closes flush with the teak deck. Under the sunbed on the foredeck is a two-storey garage for the crew tender and a pair of PWCs. Add the elevator, wider side decks and interior passages sized for wheelchair access, and every available every void had to serve a purpose.<img src="https://photo-assets.superyachttimes.com/photo/396209/image/large-486995c89e482f3860ee5f1204771fb6.jpg" data-gid="gid://syiq/Photo/396209">Hidden in plain sightThe metallic bronze faux funnel is more than a charming styling cue; it also highlights the kind of engineering concealment that defines the whole project. Since the yacht has underwater exhausts, there was no need for a traditional dry stack – nor was there space to route ducting up to one. Instead, the funnel became the home of the fresh-air unit that draws in and purifies outside air for the HVAC system. Fitting it inside that tight volume meant some early design assumptions had to be reworked.&nbsp;Routing the air quietly around the yacht from high up in the vessel posed further challenges. The onboard noise targets are uncompromising and the owner’s suite is engineered for a harbour maximum of 44 decibels, although <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Hakvoort</a> typically achieves lower. Underway, the expected levels sit in the low 50s – quiet enough that the only audible sound should be the soft splash of water along the hull. Modern superyachts achieve such low mechanical noise levels that airflow has become the primary acoustic concern, not the engines or generators.<img src="https://photo-assets.superyachttimes.com/photo/396212/image/large-a2aeb88e2ca030f7dc36a4bed74abb21.jpg" data-gid="gid://syiq/Photo/396212">“You won’t hear machinery these days – you’ll hear air moving through the ducting,” confirms Klaas. “That’s why we focus obsessively on silencing ducts, bends and terminations.”Consider the HVAC ducting for the crew quarters. To reach the lower deck forward, it has to pass under the bed in the owner’s stateroom, negotiating several dog-leg bends in the process. Air accelerates noisily through tight turns due to mass conservation and pressure shifts, so the yard routinely uses flexible elbow sections with larger diameters and internal damping to reduce turbulence and suppress sound. <img src="https://photo-assets.superyachttimes.com/photo/396214/image/large-892daf254a9606fb0d0d5fed5e58dda4.jpg" data-gid="gid://syiq/Photo/396214">Elegance with an edgeThe aluminium superstructure was built at <a data-gid="gid://syiq/Company/5231" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Alu-bouw Fryslân BV (Company)">Alubouw Fryslan</a> in Franeker and joined to the steel hull at Buijs Shipyard – the hull builder – before being towed to Monnickendam, but <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Royal Hakvoort</a> has its own joinery division and stainless-steel department that produce most of the fixed furniture and deck hardware in-house. Klaas points out the custom-engineered hinges used for the exterior doors as an example of the shipyard’s hands-on approach. During development, these hinges were tested in the most practical way imaginable: by suspending 40 kg weights to a toilet door heavily used by shop-floor workers. Any weaknesses that surfaced were corrected before installation.&nbsp;Another example is the aluminium hull platform that folds out from the topsides amidships and connects to the main deck by way of a boarding ladder for tender access. The platform being assembled in the metalworking department uses a hydraulic rotary or slew drive – more compact than conventional rams and able to generate high torque in tight spaces, it is a solution that has been refined by <a data-gid="gid://syiq/Company/40" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Hakvoort Shipyard (Company)">Royal Hakvoort</a> over years of building canoe-stern vessels.<img src="https://photo-assets.superyachttimes.com/photo/396211/image/large-9d9af2d4a7ba3a495473f7ac81ad923c.jpg" data-gid="gid://syiq/Photo/396211">Although capable of crossing the Atlantic, YB256 will primarily be used for short, comfortable runs with the frequent returns to port and high hospitality demands typical of most operational profiles. Every aspect of the interior has been conceived with wheelchair accessibility in mind, including a transformer-style platform in the stern. Guest and crew flows remain fully separated, which is not always the case on yachts of this size. The lower deck houses two full-beam VIP suites arranged around the main lobby and elevator; a third space will be used as an office/gym with a built-in recess for a running machine. The bridge deck is reserved for the owner’s sky lounge, while the captain’s cabin has been relocated to the lower deck. Crew areas have been configured to maximise discretion and operational efficiency with service and storage areas scaled to support day-use cruising.After touring the shipyard and the yacht, the lasting impression is that YB256 is not just a modern yacht in retro clothing. It is a study in constraint-driven design and smart engineering by a shipyard for whom “custom” is a vocation, not a marketing term. Its timeless elegance is more than skin deep, the result of many difficult decisions made in the belief that contemporary and classic can comfortably coexist – both in appearance and in engineering.<img src="https://photo-assets.superyachttimes.com/photo/396220/image/large-95656d748cc09cc4e461acdaecb835d0.jpg" data-gid="gid://syiq/Photo/396220">

Inside the build of a 45m Royal Hakvoort superyacht

Inside Royal Hakvoort's Project YB256, in collaboration with Hoek Design.

<a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a>&nbsp;is both a leader in the field of waterjet technology and a point of reference for serial production tenders. Active across the military, commercial, and superyacht sectors, the Italian brand is now applying its propulsion and manufacturing know-how to the specialist market for limousine tenders.<img src="https://photo-assets.superyachttimes.com/photo/396631/image/large-062ebf001bce4c2cc3c7a9d7b4ad2e91.jpg" data-gid="gid://syiq/Photo/396631">The small town of Albairate in landlocked Lombardy might seem a strange place for a boatbuilder to set up shop, but it is closely linked to the brand’s origins in one of Italy’s richest agricultural regions. Luigi Castoldi was a pioneering engineer in the agricultural machinery sector through his company BCS, which is still extant today. He began exploring waterjet propulsion – still a novelty in the early 1960s – because boats were damaging their propellers on the shallow bottom of the nearby River Ticino.&nbsp;After importing a waterjet drive, he set about re-engineering it to create a more durable and effective design. His first mass-produced <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> waterjet, model Jet 05, made its debut at the 1969 Genoa Boat Show. Since then, over 40,000 <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> waterjets have been delivered around the world, from the compact 224 unit up to the mighty 600 HCT drive that can support installed power of up to 2,700 horsepower.<img src="https://photo-assets.superyachttimes.com/photo/396632/image/large-4d83f3db58d65cf02a38baa8d387c061.jpg" data-gid="gid://syiq/Photo/396632">Today, the company is still family-owned under the directorship of Giacomo Castoldi, Luigi’s grandson, who with his father Franco spearheaded the company’s diversification into the tender market with its own range of diesel-powered jet tenders. The first model, the JT 18 Pro in 1998, served as the blueprint for the current range, from the entry-level Jet Tender 14 up to the 10.5-metre Jet Tender 34. The latter also provides the technical platform for the Jet Tender 34 Limo, the company’s first venture into the limousine market.Why waterjetsWaterjet propulsion for superyacht tenders offers several advantages over traditional propeller-based systems. These include enhanced manoeuvrability, higher efficiency and durability, lower noise and vibration, and the reversing bucket can ‘crash stop’ a boat in less than twice its own length. But arguably the most critical feature – as Luigi Castoldi was quick to realise – is shallow draft.<img src="https://photo-assets.superyachttimes.com/photo/396635/image/large-accb3204fb1c42a0f2bfa16fdfac9f5c.jpg" data-gid="gid://syiq/Photo/396635">“Jet tenders can drive right up to a beach, and most of our models are equipped with bow ramps as standard,” says Giacomo Castoldi. “Combined with a folding console, low draft also means they occupy less vertical space inside the tender garage, while the lack of exposed propeller blades reduces the potential for injury to swimmers, divers, or marine life.”Over the years, <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> has finessed its waterjet technology. Unlike other systems requiring external gearboxes, all <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> waterjets except the entry-level Turbodrive 224 DD have integrated gearboxes. This results in a more compact overall footprint, which means more space for passengers and luggage storage, and simplifies the installation process while reducing the potential for errors or rework. They are also equipped with a patented anti-clogging system that enhances the waterjet’s reliability in challenging conditions. The Clear-Duct unclogging system works by reversing the direction of the impeller and simultaneously opening the protective intake grid to flush out any debris that may have accumulated.<img src="https://photo-assets.superyachttimes.com/photo/396660/image/large-44d8926e35b1304d60e5cdbcb14c3137.jpg" data-gid="gid://syiq/Photo/396660"><a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a>’s latest waterjet drives that carry the HCT acronym have been redesigned to offer a 12% increase in performance compared to previous iterations. Advancements in impeller design, a pre-stator vane system, and an updated post-impeller stator work together to improve the flow of water through the system, reduce cavitation, and ultimately deliver more thrust combined with lower fuel consumption.&nbsp;“These enhancements are largely thanks to investment in CFD analysis,” says Giacomo, “Combining fluid dynamics with our own practical engineering know-how has generated a lot of new ideas."<img src="https://photo-assets.superyachttimes.com/photo/396615/image/large-28e2be0f5dedca48b4f2f92405172d02.jpg" data-gid="gid://syiq/Photo/396615">Total control<a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> also produces its own control systems, from simple mechanical options to the sophisticated ACES system developed in collaboration with <a data-gid="gid://syiq/Company/7877" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Xenta (Company)">Xenta</a>. Powered by a 32-bit embedded processor and utilising a proprietary CAN bus network protocol, the ACES system delivers precision control of engine RPM, waterjet steering nozzles and reversing buckets when transitioning between docking and cruising modes. Additional functions include dynamic positioning and smart anchoring, which simulates mechanical anchoring by swinging around a virtual GPS point. Adaptive steering logic can even provide ‘propeller mode,’ which recognises when the vessel is in reverse to simulate conventional propeller behaviour – a useful feature for operators transitioning to waterjets.To maintain quality control, most of the waterjet components are machined in-house, an exception being the Duplex stainless-steel impellers that rely on precision investment casting technology. With regard to tender production, the whole process – from the 3D design, hull lamination and tube fabrication to the hydraulic and electrical systems – is carried out internally before final testing in its own water basin in front of the factory.<img src="https://photo-assets.superyachttimes.com/photo/396658/image/large-b3c15147d7d49ce31a9b749e8a305ff2.jpg" data-gid="gid://syiq/Photo/396658">When <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> began production of jet tenders in the mid-90s, it decided from the start to take a platform-based approach with fixed hull forms designed around its own propulsion system. By standardising the production process, <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> ensures consistent quality while reducing unit costs through repeated tooling and manufacturing processes. Additionally, serial production provides opportunities for continuous optimisation, further enhancing the performance and quality of each new upgraded model. As the range evolved, customised interior materials, finishes and layouts have become the norm to meet the specific needs of individual clients without having to build costly and time-consuming one-offs.&nbsp;The company has applied exactly the same production philosophy to its new Jet Tender 34 Limo designed by <a data-gid="gid://syiq/Company/153" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Nauta Yachts S.r.l. (Company)">Nauta Design</a>. Conceived initially for a fleet of luxury cruise ships currently under construction, each ship will carry four <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> Jet Tender 34 Limo tenders to deliver a sophisticated ship-to-shore guest experience.<img src="https://photo-assets.superyachttimes.com/photo/396657/image/large-a20e0e70cb5a086260c495f6e811d4a1.jpg" data-gid="gid://syiq/Photo/396657">Limo luxury&nbsp;Historically, the limousine tender segment has been defined by high levels of customisation, where each unit is tailored specifically to the design and needs of a particular superyacht. While this approach allows for alignment with the mothership’s aesthetic, it often results in longer lead times, higher costs, and compromises in terms of performance and systems integration. <img src="https://photo-assets.superyachttimes.com/photo/396633/image/large-bb3ca9a1c828124e6a74dc5b67525448.jpg" data-gid="gid://syiq/Photo/396633"><a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a>’s entry into this market introduces a shift toward standardised, platform-based design, which allows for quicker production times and greater system optimisation, while still providing owners with a high degree of personalisation, particularly in the interior architecture. Two primary interior layouts are offered: one with all-seated configurations for maximum comfort, and another combining seating with a pantry and bathroom for longer transfers. Material finishes can also be tailored to suit individual preferences."This project represents a new chapter for <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> that expands our offerings to new markets, while maintaining the commitment to innovation, quality, and luxury we are known for,” says Giacomo. “The opportunity arose to enter the limousine tender market with a semi-serial product that embodies our construction philosophy of creating optimised vessels rather than one-offs.”<img src="https://photo-assets.superyachttimes.com/photo/396625/image/large-24bbf67840c4bba049f3423e568ddbaa.jpg" data-gid="gid://syiq/Photo/396625">“In practical terms, we estimate that our serial-produced limousine tenders are priced at least 35% lower than equivalent full-custom examples,” adds <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a>’s commercial director Luca Taccani, “without sacrificing the luxurious finish or technical sophistication that clients expect.”In addition to the four limo tenders, <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> is also supplying the cruise ships with two customised Jet Tender 28 SV units. The ‘SV’ stands for ‘Support Vessel,’ and the model is specifically designed to work in tandem with the limousine tenders, with an enhanced bow sun-pad, extensive storage, pantry, and premium features like a T-top.<img src="https://photo-assets.superyachttimes.com/photo/396622/image/large-6c33afd5ceeb462bb96cd2592a9fa250.jpg" data-gid="gid://syiq/Photo/396622">The flywheel effect&nbsp;As <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> has expanded its offerings and capabilities, its workforce has grown accordingly and is now nearing 100 direct employees. In terms of business performance, the company has seen consistent growth, especially over the past two years since Luca Taccani joined the company. Annual turnover is currently distributed fairly equally across the waterjet and tender markets (50% and 40% respectively) with the remainder from spare parts and commissioning activities.&nbsp;Although <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> builds its tenders in series, each sale is essentially a one-off transaction with an end client. Its propulsion products, on the other hand, can generate recurring clients that expect reliable and ongoing service. Naval procurement involving multiple waterjet units is an expanding sector for the company, for example. To meet this demand, <a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a> has made a deliberate effort to ensure the availability of components, stocking spare parts for older models well beyond customary timelines – often for more than ten years.“We’ve focused strongly on spare parts and after-sales support with dedicated back-office staff for service management,” says Luca Taccani. “This long-term outlook not only boosts customer loyalty but has also proven financially advantageous. As raw material costs have risen sharply, having a ready stock of components means we’ve been able to avoid significant cost increases.”<a data-gid="gid://syiq/Company/2027" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Castoldi S.p.A. (Company)">Castoldi</a>’s trajectory over the past few years reflects a competitive company that is expanding its product range while also refining its operational efficiency and service capabilities. By focusing on technical innovation and long-term service, it has effectively created a “flywheel” effect, whereby small but consistent wins build momentum over time in a self-sustaining cycle of growth. Moreover, the brand’s entry into the limo tender market aims to demonstrate how serial production methodologies, when combined with proprietary propulsion and rigorous quality control, can challenge the prevailing bespoke approach.<img src="https://photo-assets.superyachttimes.com/photo/396659/image/large-9f4ecad812d4f5c94c3664909275b1d8.jpg" data-gid="gid://syiq/Photo/396659">

The landlocked yard building limousine tenders

Castoldi is entering the limousine tender market with the Jet Tender 34 Limo, combining waterjet technology with a serial-production approach.

As the yachting industry begins to take alternative fuels seriously, Heikki Bergman, CEO and design manager of start-up company <a data-gid="gid://syiq/Company/8768" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Propulsion House (Company)">Propulsion House</a>, is several steps ahead. His company has developed a compact, modular methanol-electric propulsion system for yachts up to 70 metres that challenges the big marine technology brands.<img src="https://photo-assets.superyachttimes.com/photo/390298/image/large-6f876876617a86ea1297b4c7d5007042.jpg" data-gid="gid://syiq/Photo/390298">Drawing on more than two decades of experience in marine electrical propulsion, Heikki Bergman brings an engineering-driven approach to hybrid systems, with a sharp focus on real-world viability, space efficiency, and the practical constraints of small and mid-size vessels.“There’s good will in the market,” he says, “but not many customers or shipyards truly understand what they’re buying when it comes to electric or alternative-fuel systems. That’s where things often fall apart.”Now, Bergman and his team have unveiled a hybrid system he claims is capable of delivering over 5,000 nautical miles of range using methanol reformers, hydrogen fuel cells, batteries, and lightweight electric pod propulsion – all within the general arrangement footprint of an existing 45-metre, steel-hulled explorer hull designed by Frank Neubelt.<img src="https://photo-assets.superyachttimes.com/photo/390299/image/large-087f0ae7e1a2668b35e761bf7c22a0db.jpg" data-gid="gid://syiq/Photo/390299">Scaling downBergman’s journey began at <a data-gid="gid://syiq/Company/6143" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="ABB Group (Company)">ABB</a>, the Finnish leader in electrification and automation technology, where he worked on large commercial projects across Europe, particularly in the passenger vessel segment. In 2015, he identified a knowledge gap in the smaller vessel markets: while electrical and hybrid systems were becoming standard on larger ships, few people understood how to scale them down effectively for smaller yachts.&nbsp;"The big players don’t cater well to anything below 1 megawatt per propeller," he explains. "They come with massive project organisations and million-euro tickets, which just doesn’t work for yachts below 70 metres. We start from seven horsepower, up to 600 kilowatt."He founded <a data-gid="gid://syiq/Company/8768" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Propulsion House (Company)">Propulsion House</a> in 2017 as a consultancy, but it quickly evolved into a product development company. The firm now works across multiple sectors – including oil and gas – but yachting remains a core focus. The team doubled in size last year and is expected to grow again in 2026.<img src="https://photo-assets.superyachttimes.com/photo/390300/image/large-701d98e76c4b8100d4437b449c0de308.jpg" data-gid="gid://syiq/Photo/390300">Time to RethinkThe in-house propulsion system is a methanol-electric hybrid setup using the existing 45-metre explorer hull as a baseline that began with the team asking a simple but critical question: could a vessel of this size achieve 5,000 nautical miles of range using alternative fuels, without compromising usable interior volume? The answer: Yes, by completely rethinking how propulsion integrates with vessel design.At the heart of the system is the trademarked DeeCee Microgrid – a methanol-fuel-cell architecture designed for endurance, redundancy and modular installation. The system includes: six methanol reformers, which convert a methanol/water mixture into hydrogen and CO₂; six 200 kilowatt hydrogen fuel cells, fed by the reformers to generate electricity; and two 600 kilowatt battery banks, offering load balancing, peak shaving, and full-electric operation in port or during silent cruising.<img src="https://photo-assets.superyachttimes.com/photo/390301/image/large-09f5baddc586600638d912e42f93dd0f.png" data-gid="gid://syiq/Photo/390301">All the system components – fuel cells, batteries, converters – are already commercially available. Combined, they enable propulsion via two 600 kilowatt electric pods, with no shaft lines or central switchboards. Instead, the vessel uses a distributed DC network through localised electrical control units – each managing its zone independently and able to switch within milliseconds in case of blackout.“We’ve eliminated the need for a switchboard room altogether,” says Bergman. “This frees up interior volume, reduces cabling, and improves safety and redundancy.”The reforming process produces a controlled volume of CO₂, which the system can capture and store onboard for recycling. The volume of this captured CO₂ is significantly lower than from internal combustion engines – about 40-60 percent less than a diesel generator. Moreover, when taking into production methods of green methanol and e-methanol, some of which actually consume CO2 rather than release it into the air, the overall CO2 emission reduction is even higher.<img src="https://photo-assets.superyachttimes.com/photo/390305/image/large-8b7413485de1c405fa96aac8b215fe00.jpg" data-gid="gid://syiq/Photo/390305">Small, Light &amp; SmartPerhaps the most radical part of the concept is the proprietary Pulling-e Propulsion pod design. It resembles a torpedo: long, narrow, and hollow, with a stationary internal body, an outer rotating propeller shell and a 2-bladed propeller offering a good balance of efficiency and drag. Containing a permanent magnet synchronous motor and scalable from 7-600 kilowatt per propeller, there is no shaft, no gearbox, and minimal mechanical complexity. The pod can be steerable for shallow water use, or fixed with a rudder integrated into the strut that connects it to the hull.&nbsp;The unit is designed to be modular and installation-agnostic. It can be fixed horizontally to the hull, retrofitted into an old rudder socket, or even fitted with lift-enhancing struts to improve hydrodynamic flow. Unlike traditional azimuthing thrusters, which rotate 360 degrees, the pods limit steering angles but compensates via bi-directional rotation. The result is full-vector thrust control, achieved with a simpler, lighter system.<img src="https://photo-assets.superyachttimes.com/photo/390304/image/large-1e7154665ec390b5c89b7ed5b892f2e1.jpg" data-gid="gid://syiq/Photo/390304">This method also benefits noise reduction. The methanol-electric propulsion is already quiet, so the remaining main source of noise is from propeller-generated pressure pulses hitting the hull. The propellers, positioned far aft as far outboard as possible away from the hull, significantly reduce this underwater radiated noise—a growing concern for marine ecosystems.The concept isn’t just theoretical. Cambridge University’s Energy boat challenge team recognised the potential and <a data-gid="gid://syiq/Company/8768" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Propulsion House (Company)">Propulsion House</a> has been working with Marin’s top designers on the propeller optimisation, using a 15-kilowatt test unit to refine efficiency. The propellers were optimised using PropArt and PROCAL computations. A speed-power prediction based on the resistance was provided, and additional analysis was carried out in terms of steering forces and cavitation behaviour.<img src="https://photo-assets.superyachttimes.com/photo/390303/image/large-fe5f36bdbe69c88da2bda09491ac7329.png" data-gid="gid://syiq/Photo/390303">“We achieved 89 percent propeller efficiency – among the highest on the market,” says Bergman. “And when we scale up to the size used on yachts, efficiency actually increases due to the larger central hole in the propeller. And that’s just the first iteration available.”The system is also suited for retrofits. In theory at least, shaft lines could be removed entirely and the new propulsion unit installed into the existing rudder sockets, reducing the need for invasive hull perforations. The structural load is carried in a way similar to rudder mechanics, with reinforcement achieved by increasing material thickness inside the torpedo's cooling pipe. <img src="https://photo-assets.superyachttimes.com/photo/390302/image/large-279388f3d090554f024470e1514e9ec4.png" data-gid="gid://syiq/Photo/390302">A New Design OrderPerhaps most radical is the company’s approach to vessel design itself. “We start from the underwater section,” Bergman explains. “First the hull, then the propeller location, and then everything else. Not the other way around.”This inverted design process contrasts with the traditional method of selecting off-the-shelf propulsion systems first, which often forces compromises in hull shape, hydrodynamics and interior layout.With partners already on board for further testing in 2026, and interest growing among shipyards and owners, <a data-gid="gid://syiq/Company/8768" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Propulsion House (Company)">Propulsion House</a> is positioning itself not just as a technology provider, but as a strategic design partner. By simplifying systems, reducing space usage, offering real redundancy, and embracing cleaner fuels, Bergman believes a better class of hybrid yacht is not only possible – it’s ready to build. “There’s no fantasy here,” says Bergman. “This could be built tomorrow.”&nbsp;

Heikki Bergman Propulsion House CEO Interview

Propulsion House CEO sites down with SYT to discuss the compact, modular methanol-electric propulsion system for yachts.

Inside the push for methanol-electric yacht propulsion with CEO Heikki Bergman

If home is where the hearth is, then the galley is certainly a fundamental element of any superyacht. Whether enjoying a 10-course taster menu or a teppanyaki treat on deck, food is central to the onboard experience. We take a look at how to avoid second-rate cooking spaces and equipment.When people talk about superyachts, the highlights always seem to revolve around the same things: the beach club, the sundeck, the pool, the master stateroom. The galley barely gets a second thought, until you spend time on board –&nbsp;then the food and its service take centre stage and any issues to do with layout, design or installation become belatedly obvious.Naturally, safety is paramount. Galleys present a host of hazards from deep fryers and steamers to rotating equipment and sharp blades. Fire suppression, hygiene, ventilation, materials, and so on, are governed by classification society rules, but small details like having rounded internal radii instead of sharp corners in stainless steel cabinets help prevent dirt accumulation and make cleaning much easier for galley staff. Ergonomics and design are equally important.<img src="https://photo-assets.superyachttimes.com/photo/394386/image/large-95000aca9788e63f3727ba677f1045e1.jpg" data-gid="gid://syiq/Photo/394386">“The galley layout is defined according to the capacity of the yacht, considering both guests and crew,” says Costanza Pazzi, project architect at <a data-gid="gid://syiq/Company/12" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="CRN (Company)">CRN</a>. “It is usually designed with three clearly distinct areas: washing, cooking, and preparation.”Separate traffic flows for clean and dirty dishes help prevent cross-contamination and accidents. Adequate lighting is a sometimes overlooked consideration, especially for galleys on the lower deck with smaller windows where the artificial lighting should emulate daylight temperatures (4000K-5000K) to show the true colour of the food being prepared.“Each custom superyacht galley is different,” Pazzi continues. “The spaces dedicated to galley and pantries should be discussed as part of the technical specifications at contract completion, with guidelines coming directly from the owner’s team. A fundamental requirement is that ducting and systems need to be defined in the general plans from the outset.”<img src="https://photo-assets.superyachttimes.com/photo/394417/image/large-7799ab22eb4f8b77c27d0e82de2c9dc0.jpg" data-gid="gid://syiq/Photo/394417">Experience counts“The galley is not just one room – it’s an entity,” says Brennan Dates, a chef with more than 25 years’ work experience on superyachts. Currently head chef aboard 87.6-metre <a data-gid="gid://syiq/Yacht/2354" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Project X87.6m (287'5&quot;)Golden Yachts Ltd.2022">Project X</a>, he also consults on galley design through his company <a data-gid="gid://syiq/Company/7686" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Superyacht Galley Designs (Company)">Superyacht Galley Designs</a>. His refit and new-build galley projects includes <a data-gid="gid://syiq/Yacht/234" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Ecstasea85.95m (281'12&quot;)Feadship2004">Ecstasea</a>, <a data-gid="gid://syiq/Yacht/1713" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Mogambo73.51m (241'2&quot;)Nobiskrug2012">Mogambo</a>, <a data-gid="gid://syiq/Yacht/9442" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Dragonfly142.0m (465'11&quot;)Lürssen Yachts2024">Dragonfly</a>, <a data-gid="gid://syiq/Yacht/10316" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Obsidian84.2m (276'3&quot;)Feadship2023">Obsidian</a>, the first <a data-gid="gid://syiq/Yacht/6409" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonrise99.9m (327'9&quot;)Feadship2020">Moonrise</a> and second <a data-gid="gid://syiq/Yacht/11108" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonrise100.7m (330'5&quot;)Feadship2025">Moonrise</a> yachts, and a 100-metre-plus vessel currently under construction.&nbsp;“Where does the food come into the boat, especially on larger yachts when you’re &nbsp;talking about shell doors and pallets of produce?” he asks. “How does the food get stored, and where is the cold storage located? Which deck is the galley on? Where are the pantries and which decks are the guests eating on? Some food is stored in the galley, then it gets prepped, possibly stored again, then gets heated or reheated, plated and served, and now you’re talking about pantry flow.” <img src="https://photo-assets.superyachttimes.com/photo/394418/image/large-c4c49eab3aaeeb1639265cfacfe9f9ee.jpg" data-gid="gid://syiq/Photo/394418">It’s also important to consider the operational profile of the yacht, because there’s a difference between a purely private yacht and one that’s going to be busy chartering. Is it going to be doing extended cruising to remote locations, which may require bigger dry stores and cold rooms?“I can walk into a galley and within five minutes know if there was a yacht chef involved in the build,” says Dates. “But no one’s really listening to chefs at this point, and I think that negatively impacts on the whole guest experience, but also the crew.”<img src="https://photo-assets.superyachttimes.com/photo/394416/image/large-f89be51556d3eb7510c568074aeb1395.jpg" data-gid="gid://syiq/Photo/394416">One thing for sure is that dumb waiters are mostly a thing of the past, with crews preferring to use the space for additional storage or fridges. Dates further warns against the use of domestic kitchen appliances on board in what are essentially commercial kitchens, where stuff tends to break down much faster. “Rational is the number one in the world for ovens, and MKN is up there,” he advises. “There’s a precipitous drop after those two.”On-deck delightsThese days, the galley is only one centre of chef action on board. There will likely be outdoor cooking stations in the build plan, particularly on charter yachts. <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a>’s <a data-gid="gid://syiq/Yacht/6424" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hadar136.0m (446'2&quot;)Lürssen Yachts2019">Hadar</a>, for example, features an extensive outdoor kitchen on the bridge deck aft, where guests can watch the chef working a wok station, a coal-powered Spanish Josper grill, a rotisserie, and pizza/teppanyaki/tandoori ovens.&nbsp;“At a bare minimum there needs to be a sink and refrigeration, just for basic sanitation,” Dates says. “If you can have a little trash compartment that’s sealed away that’s useful, and then it comes down to equipment – there’s a really good oven by MKN that fits under the counter and which takes care of its own exhaust and accepts standard 535x325 millimetre gastronomic trays.”“There is an ever-increasing demand for the inclusion of pizza ovens, particularly for yachts over 60 metres,” adds Pazzi, “There is also a trend for a table in the main galley where guests have the chance to see the chef working and enjoy a food tasting, aimed at creating a sensory experience.”&nbsp;Open-plan, country kitchen-style layouts are increasingly popular on smaller yachts, and on “galley-up” catamarans where the cooking area become an integral part of family life on board. The <a data-gid="gid://syiq/Company/374" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sanlorenzo (Company)">Sanlorenzo</a> 64Steel <a data-gid="gid://syiq/Yacht/6178" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Attila64.0m (209'12&quot;)Sanlorenzo2019">Attila</a> even has a custom-made barbecue pit inside the main deck dining area for preparing Argentinian-style steaks. <img src="https://photo-assets.superyachttimes.com/photo/394422/image/large-e484db9dd7caca3e714a505d18be3385.jpg" data-gid="gid://syiq/Photo/394422">Breathing easyAlongside cooking comes the risk of odours, which can quickly infiltrate indoor guest areas if ventilation and extraction aren’t properly designed. During the design of the second <a data-gid="gid://syiq/Yacht/11108" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonrise100.7m (330'5&quot;)Feadship2025">Moonrise</a>, for example, the owner requested a taller mast so galley fumes are not blown back onto the sundeck after being vented.&nbsp;&nbsp;The air extraction system in the pro-spec galley aboard the 76.6-metre explorer yacht <a data-gid="gid://syiq/Yacht/4734" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Albatross76.6m (251'4&quot;)Piriou2015">Albatross</a> highlights how smart design can maximise energy efficiency. Extractor fans typically suck the air out of a room, which has to be replaced anew with fresh, treated air. But when the outside temperature is -20°C that could mean firing up another generator just to reheat the air because the galley is in use. On <a data-gid="gid://syiq/Yacht/4734" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Albatross76.6m (251'4&quot;)Piriou2015">Albatross</a>, the cowling above the cooking hobs also creates a curtain of treated air that effectively isolates the cooking area, saving HVAC energy while containing cooking odours and maintaining a constant temperature in the galley. A similar system has been installed on the all-electric sailing yacht Project Zero.<img src="https://photo-assets.superyachttimes.com/photo/394426/image/large-b6d6a20d4c21394ec767a94b34324a08.jpg" data-gid="gid://syiq/Photo/394426">Galley design extends to the handling of waste produce, which includes both garbage and wastewater treatment. The latter is particularly pertinent, because food contaminants and grease can wreak havoc with onboard water treatment systems (this topic is specifically addressed in <a href="https://issuu.com/superyachttimes/docs/how_to_build_it_-_issue_9" rel="noopener noreferrer" target="_blank" title="">Issue 9&nbsp;</a>of How to Build It).&nbsp;“Fat, oil and grease (FOG) need to be separated – this is very important not only for the wastewater treatment process, where they can affect the biological process or clog filters, but also to prevent clogging of pipes,” confirms Georgios Kariofilis, Sales Manager at <a data-gid="gid://syiq/Company/8602" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hamann AG (Company)">Hamann</a>. “Having a grease trap and a pre-filter system is the first step to avoiding such problems.”Organic trash handling, typically resolved by storing garbage in a refrigerated room or in a deck locker, is also making advances. Dehydration plants, such as those offered by Evac and Eco-Smart, remove water content from food waste by heating it to around 80ºC and evaporating it off as steam. The sterile and odourless residual food waste is roughly 15 to 20 percent of its former volume and can be stored more easily on board for later disposal or composting. Essentially, it means you don’t need as big a trash storage room.<img src="https://photo-assets.superyachttimes.com/photo/394420/image/large-a3eda501d5fdaf6da7497de827b67522.jpg" data-gid="gid://syiq/Photo/394420">Ask an expert&nbsp;The advice from designers and chefs is basically to bring in an expert at the layout stage of design, and to argue for more space rather than less, no matter the size of yacht. Speciality companies like UK-based <a data-gid="gid://syiq/Company/2137" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="GN Espace Galley Solutions Ltd (Company)">GN Espace</a> offer expert advice for superyacht galley layouts and equipment spec, including full commercial galleys and upgrades such as adding a robust powder coated finish to stainless steel doors to match the rest of the yacht.Large or small, yacht designer Guido de Groot argues that the galley is generally in full-time use – especially on charter vessels. He compares the 10 guests plus eight crew aboard the 35-metre <a data-gid="gid://syiq/Company/2948" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Van der Valk Shipyard (Company)">Van der Valk</a> yacht <a data-gid="gid://syiq/Yacht/13018" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lalabe35.31m (115'10&quot;)Van der Valk Shipyard2025">Lalabe</a> with a 50- or 60-metre vessel that might have 12 guests and 14 crew.“It’s a similar number of guest and crew, so you can’t just halve the size of the galley on the smaller yacht,” he points out. “It requires a lot of smart thinking to get everything into a more compact space.”“Give the galley and associated areas the space they deserve,” insists Dates. “Is luxury jamming the galley in the bottom of the boat and having food travel up four decks, or is it spending resources to have the galley on the main deck nearer to where guests will eat? Because that’s what I would want.”<img src="https://photo-assets.superyachttimes.com/photo/394419/image/large-c9630b9438c0f3772c24b74a369972a1.jpg" data-gid="gid://syiq/Photo/394419">Shipyards looking to streamline the planning process with standardised solutions sometimes argue against bringing in a consultant chef at the design stage. All chefs have their own routines, preferred equipment, likes and dislikes, but individual chefs do not stay with a yacht indefinitely. The galley, on the other hand, will remain for many years, or at least until a major refit. &nbsp;“Not including a superyacht chef in the build is like building a race car and not talking to the driver because they’ll want different buttons in different places,” counters Dates. “It doesn’t make any sense to have someone who’s never done the job be the one to put it all together.”

Why superyacht galley design matters to the onboard experience

How thoughtful superyacht galley design can improve safety, service, storage, ventilation and the wider onboard dining experience.

Galley design: "It's like building a race car without talking to the driver"

Inside Baltic Yachts’ first carbon catamaran build

Inside the build of Zeteo, Baltic Yachts’ first catamaran featuring carbon construction and hybrid propulsion.

Inside the build of 33m Zeteo: Baltic Yachts’ first carbon catamaran

More than a speculative future concept, the AERA catamaran represents the convergence of mature technologies assembled with an emphasis on simplicity and sustainability. Research and testing have shown the project is both feasible and buildable. The focus now is on systems integration and production scaling.<img src="https://photo-assets.superyachttimes.com/photo/371664/image/large-bcc3594f61ee7b5986053ac54a532b0c.jpg" data-gid="gid://syiq/Photo/371664">Developed by <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a> in collaboration with sister company <a data-gid="gid://syiq/Company/458" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rondal B.V. (Company)">Rondal</a>, <a data-gid="gid://syiq/Company/7904" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Artemis Maritime (Company)">Artemis Technologies</a>, and designer <a data-gid="gid://syiq/Company/43" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Cor D. Rover Design (Company)">Cor D Rover</a>, AERA is a technical study into the feasibility of combining wind-dominant propulsion, low-drag hydrodynamics and alternative energy systems within the constraints of a large luxury yacht.&nbsp;The 50-metre catamaran builds on the shipyard’s Project Tidal Shift, an internal innovation initiative that identified increased utilisation of sail power and systemic reductions in energy demand as the most effective pathways towards sustainability. From the outset, the project followed an engineering-first methodology in which energy demand and drag were reduced before alternative energy sources were applied. This approach informed decisions across platform selection, structural engineering, rig design and onboard energy systems.“Early concept development did not initially assume either a multihull platform or a wing sail,” says Herman de Jong, innovation manager at <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a>. “Our initial investigations focused on automation of conventional rigs and the use of delivery sails to reduce dependence on costly sail inventories.”Collaboration with <a data-gid="gid://syiq/Company/7904" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Artemis Maritime (Company)">Artemis</a> introduced the possibility of wing-based propulsion, with early consideration given to soft wing concepts derived from high-performance foiling monohulls. These were ultimately rejected due to the large structural loads required to shape the membrane, the resulting rig forces transferred to the hull, and the limited suitability for the operational profile of a superyacht. A rigid wing sail was identified as aerodynamically superior, functioning as a true air-foil with 10 times lower drag than a conventional tube mast (even with the sails lowered), while also allowing passive feathering when unloaded.<img src="https://photo-assets.superyachttimes.com/photo/371695/image/large-f6fba2ad9ba66c269310feeea6a26fee.jpg" data-gid="gid://syiq/Photo/371695">Active control“Wing sails have been proven in racing environments such as the America’s Cup and <a data-gid="gid://syiq/Company/6878" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="SailGP (Company)">SailGP</a>,” argues Dr Iain Percy, founder and CEO of <a data-gid="gid://syiq/Company/7904" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Artemis Maritime (Company)">Artemis Technologies</a>, himself an AC veteran and double Olympic champion. “The challenge here is adapting that performance into a reliable, low-maintenance system suitable for a superyacht. To do that, a significant part of the development has focused on active control to manage performance, comfort and manoeuvring across a wide range of conditions.”Initial testing of the wing concept was conducted using a free-standing, rotating carbon-fibre wing mounted on a J22 test platform. The trials confirmed the wing’s ability to passively align with the wind and maintain low drag, but also revealed some dynamic coupling between the wing’s oscillatory behaviour and the natural roll frequency of the monohull. These findings convinced the team to focus on a multihull configuration, as the increased initial stability of a catamaran minimises roll-induced excitation of the wing system and the loads on the two sets of bearings inside the yacht, although <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a> does not preclude monohull applications in the future.<img src="https://photo-assets.superyachttimes.com/photo/371647/image/large-3db5887279a6542cf289be78a33db442.jpg" data-gid="gid://syiq/Photo/371647">“The wing sail concept is better suited to a catamaran platform as the rig remains upright and is not subjected to large heel-induced load variations,” explains de Jong. “By limiting heel angles, the vessel also avoids one of the primary deterrents for owners transitioning from motor yachts to sailing yachts, not to mention the absence of flogging sails and running rigging.”The wing comprises a thin aerodynamic Mylar skin supported by a carbon-fibre framework of spars, ribs and transverse plates, which manage the global bending and torsional loads much like the wings of an airplane. Controlled flexibility is incorporated into the design to allow the wing to twist under load, improving lift distribution and reducing peak stresses. <img src="https://photo-assets.superyachttimes.com/photo/371658/image/large-87c2c4becc7abb55160fd76750f46e73.jpg" data-gid="gid://syiq/Photo/371658">AutomationAutomation is fundamental to the operational viability of the wing system. Conventional sail handling is replaced by wing rotation and deflection of the four trailing-edge flaps, actuated by hydraulic cylinders at the root of each flap. Sensor-driven software continuously adjusts the wing’s angle of attack and flap configuration in response to wind conditions, reducing crew workload and minimising the risk of human error. The control algorithms are the result of CFD models developed in collaboration with Artemis, drawing on experience from high-performance sailing applications.&nbsp;Feathering is a critical safety feature, so if the active system fails the wing naturally aligns with the wind and minimises drag. In extreme or turbulent conditions, it is designed to depower automatically to a low-load, low-drag state without requiring crew intervention. Although it’s designed to remain upright in all weather conditions, a hydraulic hinge mechanism allows the entire wing to be lowered to reduce air draught for bridge clearance or maintenance purposes. <img src="https://photo-assets.superyachttimes.com/photo/393334/image/large-cbf9c3c68a163712f4ddc521e251b194.png" data-gid="gid://syiq/Photo/393334">From a lifecycle standpoint, Dr Percy points out that a wing sail replaces a consumable system with a permanent one. Conventional sails degrade and require regular replacement, whereas a properly designed wing can last for the life of the yacht. This permanence shifts cost and maintenance considerations away from periodic sail replacement towards upfront engineering and long-term reliability.“Manufacturing feasibility has also been a central consideration throughout development,” says Bart van der Meer, sailing system engineer at <a data-gid="gid://syiq/Company/458" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rondal B.V. (Company)">Rondal</a>. “Each rib of the wing requires a unique mould due to the changing airfoil geometry along the span. We expect production-scale moulds are expected to be fabricated from milled aluminium to ensure dimensional accuracy and repeatability.”Although these challenges are not trivial, they are a question of process optimisation rather than unresolved technical risk.<img src="https://photo-assets.superyachttimes.com/photo/393329/image/large-e0fb3f469c6062ee583c2c1998445a5c.jpg" data-gid="gid://syiq/Photo/393329">Built like a bridgeStructurally, the AERA catamaran departs from conventional multihull architecture through the use of principles derived from cantilevered bridge design – notably the historic Koningshaven Bridge (also known as ‘De Hef’) close to <a data-gid="gid://syiq/Company/43" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Cor D. Rover Design (Company)">Cor D Rover</a>’s studio in Rotterdam. The triangulated geometry spans large distances between pillars, enabling open-plan interiors and extensive glazing without visually dominant pillars.&nbsp;The asymmetrical geometry of the vessel is a functional response to spatial and structural requirements rather than an aesthetic gesture. Although the deck levels appear unsupported, structural integrity is maintained through clearly defined global load paths disguised in features such as staircases. <img src="https://photo-assets.superyachttimes.com/photo/371698/image/large-b28b9a6de23b265903ea61bfe20d603d.png" data-gid="gid://syiq/Photo/371698">“The geometry follows the forces rather than being applied as a stylistic layer,” explains <a data-gid="gid://syiq/Company/43" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Cor D. Rover Design (Company)">Cor D Rover</a>. “Structural cut-outs allow semi-open areas to remain outside the tonnage calculations while still contributing to stiffness and spatial articulation. Despite this unconventional arrangement, the enclosed volume is carefully controlled at approximately 1,880 cubic metres, keeping the vessel below the 500 GT threshold.”Material selection for the hull and superstructure is centred on aluminium, chosen for its strength-to-weight ratio, recyclability, and compatibility with <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a>’s expertise in working with lightweight aluminium alloys. Weight control is particularly critical for a catamaran, as increased mass directly raises wetted surface area and drag. <a data-gid="gid://syiq/Company/7904" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Artemis Maritime (Company)">Artemis Technologies</a> was closely involved in optimising the hull forms to balance hydrodynamic efficiency with superyacht functionality.“Our naval architects actually found the constraints of the superyacht design space to be a valuable tool in refining the hull shapes,” says Dr Percy. “By working within a predefined functional window that takes into account accommodation needs, utilities and other essential factors, they were able to focus on local optimisation and maximise the efficiency of the hull design.”<img src="https://photo-assets.superyachttimes.com/photo/393335/image/large-11dc06fc86174d979606f874bfc85d4a.png" data-gid="gid://syiq/Photo/393335">Energy generationEquipped with two retractable, forward-facing, azimuthing thrusters, AERA’s energy generation is organised around a hybrid diesel-electric architecture and 580-kWh battery bank for efficient integration of multiple power sources. <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a> installed a similar system on 60-metre <a data-gid="gid://syiq/Yacht/8258" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sarissa59.7m (195'10&quot;)Royal Huisman2023">Sarissa</a> in 2023, but on AERA has added compressed hydrogen tanks for supplying a low-temperature PEM hydrogen fuel cell. With Approval in Principle from Lloyd’s Register, the system is designed to provide approximately 72 hours of silent hotel-load operation.As with <a data-gid="gid://syiq/Yacht/8258" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sarissa59.7m (195'10&quot;)Royal Huisman2023">Sarissa</a>, hydrogeneration plays a primary role during sailing with under-hull generators optimised for operating speeds between 11 and 12 knots. At these speeds, continuous power output of around 40 kW is achievable, sufficient to cover hotel loads and allow generators to remain offline. The fixed, low-drag hydrogenerators deliver optimal performance without the added complexity of retraction mechanisms – a solution that aligns with AERA’s ethos of simplicity and high efficiency.<img src="https://photo-assets.superyachttimes.com/photo/393328/image/large-15f017ba3b5bb5892a3a52ed2dc5ad1c.jpg" data-gid="gid://syiq/Photo/393328">“Our simulations show that during a typical cruising week, including one visit shoreside when shore power is available, the yacht will not need to run her variable-speed gensets for hotel loads,” says Jidde Looijenga, innovation manager at <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a>. “They are needed only during motoring or motor sailing to generate electricity for the retractable propulsion system. Naturally, they can also run on HVO for substantial reductions in CO₂ and Nox emissions.”Together with <a data-gid="gid://syiq/Company/43" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Cor D. Rover Design (Company)">Cor D Rover</a>, the shipyard team is exploring the integration of wind turbines to generate electrical power at anchor or in port. Any such system would be supplementary rather than critical and, as the designer notes, “would need to operate with very low noise and vibration to be acceptable in a yacht environment.” These ideas are not on the project’s critical path, but they illustrate potential future extensions of <a data-gid="gid://syiq/Company/122" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Royal Huisman (Company)">Royal Huisman</a>’s renewable energy strategy.<img src="https://photo-assets.superyachttimes.com/photo/393332/image/large-3aaca815d143ace4293d0ef4519ca552.png" data-gid="gid://syiq/Photo/393332">UsabilityBeyond technical feasibility, the AERA concept also addresses usability and the owner experience. The combination of automation, reduced manual sail handling, and increased comfort is intended to make sailing more accessible and as straightforward as operating a motor yacht.&nbsp;“Combined with reduced fuel consumption and lower operational emissions, this positions AERA as a bridge between motor and sailing yacht ownership,” says Looijenga.Overall, the catamaran represents a convergence of proven technologies and disciplined system integration rather than reliance on untested innovations. With its emphasis on simplicity, sustainability and lifecycle efficiency, the concept demonstrates that a wind-dominant, low-emission superyacht is technically achievable within available engineering and classification frameworks.<img src="https://photo-assets.superyachttimes.com/photo/371693/image/large-d494cdf4de75a63242521821d563f54f.png" data-gid="gid://syiq/Photo/371693">

Royal Huisman AERA catamaran

Royal Huisman's 50m hydrodynamic luxury yacht 

AERA catamaran: The wind-dominant, low-emission sailing superyacht

Starting out as a captain, Simon Finlayson quickly found himself drawn into the mechanics of new-build decision-making – first as a build captain, then as an owner’s representative. Recognising the value of understanding how yachts are built from the inside out, he moved into the yards, working within both project management and production team, to close the knowledge gap between owner expectations and shipyard execution.<img src="https://photo-assets.superyachttimes.com/photo/390228/image/large-d82f02d6f20048f162b3e9f36ff01c3a.jpg" data-gid="gid://syiq/Photo/390228">You’ve worked across both sailing and motor yachts. What’s the biggest practical difference from a build perspective? A sailing yacht spends much of its life heeled over, while a motor yacht generally operates upright but rolls. That single reality drives countless knock-on decisions. Something as basic as getting suppliers to confirm their equipment will operate at heel sounds simple, but it’s a major consideration that can be overlooked until late in the process. Beyond that, industry culture differs. Sailing yacht teams often have more human connection and personal involvement in material choices and how the boat comes together. Motor yacht projects, especially at the larger end, tend to be more contract-led – lines are more clearly defined, and communication can become more formal and legalistic.<img src="https://photo-assets.superyachttimes.com/photo/372358/image/large-f8a547ead4e5dc9366a98d8c53b3ebb5.jpg" data-gid="gid://syiq/Photo/372358">Where do sailing yacht builds demand the most attention during construction? Construction and engineering discipline – particularly strength versus weight and load management. Sailing yachts face more dynamic load cases than motor yachts. Rig, structure, deck gear, and load paths have to be correct because the forces are very real and move around the boat depending on sail plan and conditions. Then there’s the constant balancing act between complexity, available space, and operational simplicity. You can specify incredible technology, but someone has to operate it while also sailing the yacht. It’s very easy to spiral into systems that are elegant on paper yet impractical at sea.You mentioned technology can become a “rabbit hole”. What does that mean in practice? It often starts with good intentions: more automation, more integration, more capability. Engineers are focused specialists and can build something technically impressive. But if the operational interface becomes too complex, the crew won’t embrace it, faults become harder to diagnose, and the yacht ends up carrying systems that don’t truly help. The challenge is finding a workable middle ground – systems that deliver performance without turning routine operation into an engineering exercise.<img src="https://photo-assets.superyachttimes.com/photo/106261/image/large-8723f43ab69bd20d62467c9657646233.jpg" data-gid="gid://syiq/Photo/106261">You’ve been brought into projects to assist with re-aligning goals and expectations. What’s your go-to framework for getting control quickly? I try to keep it simple and scaleable: what did you say you would do, what are you doing now, and does that still fit our expectations?’ Then keep looping that conversation until everyone agrees on what “done” looks like. It’s mostly expectation management – but grounded in facts, not opinions.How do you bring shipyard processes into sync with specialist contractors and designers? By respecting expertise. If I come to you for doors, it’s because you’re the best at doors – you should advise how to solve the problem. Shipyards can sometimes push a “we always do it like this” approach, but many suppliers have good reasons for their preferred methods. In the Netherlands especially, you see deep specialisation. The industry is successful because experts can operate within a niche at the top end of their field. The best outcomes come when you give that expertise space, listen, acknowledge it, and then clearly define demarcation and deliverables.<img src="https://photo-assets.superyachttimes.com/photo/185959/image/large-e9814fcc0864c8409951eb957946f58b.jpg" data-gid="gid://syiq/Photo/185959">Where do schedules most commonly come under pressure on new builds? There are typically two pinch points. First is the start of construction. Different yards approach engineering and production differently. Some “engineer, then build”, while others start building early to protect the programme. Either way, you need clear decision gates – moments to say, “we know enough to proceed,” or equally, “we don’t know enough yet, so stopping now prevents rework later.”Then there is finishing and acceptance. Getting from a dynamic production environment to a finished, accepted space or system requires a high level of coordination. Someone has to confirm it is correct – yard-side or owner-side – and that acceptance can &nbsp;proceed based on facts rather than opinions. It requires checking, testing, cleaning, close-out, and a shared understanding of what remains outstanding. It’s easy to reach the end of hours or budget and declare, “it’s done.” In reality, that’s often the start of the hard part: delivering something that can be signed off with confidence.<img src="https://photo-assets.superyachttimes.com/photo/367902/image/large-6b292765f8464aaae3fe8b1c81e49d1e.jpg" data-gid="gid://syiq/Photo/367902">Change orders can lead to major timeline extensions. Can they be prevented? Not always. The first question is whether the change is driven by necessity or desire. Sometimes change is essential for safety, practicality, compliance, or evolving technology. The key is catching it early enough to minimise impact, and that brings us back to the one tool that matters at every level: the specification. Every conversation – with the owner’s team, suppliers, and within the yard – should orbit the spec. The moment you realise you’re discussing something that wasn’t agreed, you stop and reset: why are we talking about this change, what decision is required, and how do we proceed? If you lose the spec, you lose control.&nbsp;What technical trends are most likely to influence yacht building over the next decade? Propulsion and energy architecture will determine the technological backbone of future yachts. Moving toward battery-driven propulsion and DC-based electrical systems rather than traditional AC isn’t a bolt-on change – it affects the entire vessel. It requires a shift in engineering knowledge, build experience, and operational capability. You can design these systems, but they must be simple enough for the crew to operate. If nobody can operate it, you can’t build it – at least not responsibly.Another major theme is materials availability, with teak decks becoming a particularly visible battleground. It’s not only about sourcing; it’s about persuading stakeholders to rethink what a “proper” deck should look and feel like. The industry is, by nature, building the future using the past. That’s powerful, but it can also trap you in familiar solutions when the best answer is changing.<img src="https://photo-assets.superyachttimes.com/photo/113629/image/large-ebbb6667281aa6927f85947a0a313e82.jpg" data-gid="gid://syiq/Photo/113629">You’ve been involved in some standout yachts. Which projects most shaped your approach as a project manager? <a data-gid="gid://syiq/Yacht/4241" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Wisp47.65m (156'4&quot;)Royal Huisman2014">Wisp</a> was a pivotal learning curve – a classic sailing yacht build that showed me how much I still didn’t know about shipyard reality, even when deeply involved on site. Later, working inside a shipyard environment at De Vries on major deliveries such as Moonrise and Bliss accelerated my understanding of just how complex coordination can be.The real benchmark for me, though, has been the <a data-gid="gid://syiq/Yacht/6409" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonrise99.9m (327'9&quot;)Feadship2020">Moonrise</a> programme, because I experienced it from both sides – first for the shipyard and then within the owner’s team on the subsequent project, <a data-gid="gid://syiq/Yacht/11108" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonrise100.7m (330'5&quot;)Feadship2025">Moonrise II</a>. That provided a complete view of how decisions, quality control, documentation, and delivery pressures differ depending on where you sit.When design intent is clear and the drive for quality is genuinely high, you get something rare: a yacht where you walk through and everything feels right – layout, flow, system logic, and finish. Being part of that elevates your own performance and sets a standard you try to carry into every other project.

Simon Finlayson on successful yacht building

Simon Finlayson shares expert insights on successful yacht building, from design and engineering to managing expectations and delivery.

Inside Angle: Simon Finlayson on navigating the mechanics of yacht builds

<a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a>, the Netherlands-based synthetic decking specialist, has been serving the superyacht industry since the 1990s. Over that time it has witnessed shifts in materials, expectations and regulations, including the EU’s 2021 ban on old-growth teak from Myanmar, which have encouraged owners and shipyards to seek out high-performance alternatives. Fresh from completing one of its most technically demanding projects to date, <a data-gid="gid://syiq/Company/64" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Oceanco (Company)">Oceanco’s</a> 111-metre <a data-gid="gid://syiq/Yacht/10354" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Leviathan111.0m (364'2&quot;)Oceanco2025">Leviathan</a>, <a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a> CEO Rientz Willem Bol discusses the company’s recent acquisitions, material R&amp;D, and long-term strategy.<img src="https://photo-assets.superyachttimes.com/photo/389541/image/large-1834f21cd3fcb472d40fd788c16611fc.jpg" data-gid="gid://syiq/Photo/389541">Last year, you acquired Nautifit in The Netherlands and Boteka in Florida. What was the rationale behind this?By bringing Nautifit into <a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a>, we increase customer value and expand our prefabrication capacity in Europe. This accelerates the development of new prefab applications and makes us faster, sharper and more creative in what we can offer our clients.Boteka has been a trusted partner of ours in the cruise ship sector for more than 14 years. The acquisition was driven by two key objectives. First, vertical integration. By bringing Boteka fully into the <a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a> organisation, we can keep everything we produce under one roof. Second, geographic reach. Having a strong base in the US allows us to operate across multiple continents and serve the global market with the same consistent standards.<img src="https://photo-assets.superyachttimes.com/photo/374242/image/large-4f6cb53c5b0b2f91e00245841dcc6a16.jpg" data-gid="gid://syiq/Photo/374242">What made&nbsp;<a data-gid="gid://syiq/Yacht/10354" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Leviathan111.0m (364'2&quot;)Oceanco2025">Leviathan</a>&nbsp;such a complex project for&nbsp;<a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a>?What made this project unique was the close collaboration between the owner’s team, <a data-gid="gid://syiq/Company/64" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Oceanco (Company)">Oceanco</a>, and <a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a> throughout the design phase and execution. Compared to the scale of some of the cruise ship decking we’ve worked on, <a data-gid="gid://syiq/Yacht/10354" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Leviathan111.0m (364'2&quot;)Oceanco2025">Leviathan</a> is actually quite small. We were working with just a few thousand square metres compared to 10-20,000-square-metres on some of our larger projects. However, the time investment was comparable. This is because of the level of complexity and detail it required. We were working to an inspection tolerance of just 1.5 millimetres over three-metres – an unprecedented level of flatness and consistency for a yacht of this size. Achieving this meant deploying up to 16 highly skilled specialists on the project. Material choice added another layer of difficulty. The design required a blue pigment, which is among the most challenging colours to stabilise in resin-based systems. In many ways, we weren’t simply delivering a deck – we were realising a design object in its own right. <img src="https://photo-assets.superyachttimes.com/photo/374254/image/large-dd7155f66c665783416d641846d8d349.jpg" data-gid="gid://syiq/Photo/374254">How is R&amp;D currently shaping the development of synthetic decking?UV resistance is a major focus. Owners expect colour stability over many years, even with constant exposure in extreme climates, so improving long-term performance under UV load is critical. We’ve also developed so-called “cool pigments” and techniques to reduce surface temperature, making decks more comfortable to walk on in hot regions. We can now embed functional lighting directly into the deck. One example is helicopter landing areas: using gyroscopically informed lighting, the system changes colour in response to vessel movement, giving pilots immediate visual feedback on whether conditions are safe to land. This technology originated from our work on naval frigates, where safety requirements are uncompromising. Beyond materials, we are becoming much more data-driven as a company. By integrating sensors into decks, we can analyse how people move and behave onboard, allowing us to optimise functionality and safety.<img src="https://photo-assets.superyachttimes.com/photo/374247/image/large-6da0558a1b1f317874e656c98e57635a.jpg" data-gid="gid://syiq/Photo/374247"> We still see a lot more teak decks on new builds than synthetic ones and it appears that, outside of technical areas, owners still want wood. What are your thoughts on this?&nbsp;We do see a shift in mindset, but we’re in a transition phase. When something old and familiar comes under pressure or begins to disappear, people initially look for something that comes as close as possible. Designers and owners often fall back on materials that reference familiar imagery and heritage, driven by aesthetics and emotion. In that search, choices are frequently made based on visual similarity, even if that means compromising on performance or longevity. That tendency usually persists until real-world use reveals that these materials age differently from the original, for example, by degrading more quickly or lacking essential properties such as wear resistance, or resistance to porosity and water absorption. At that point, the question shifts away from what looks similar, towards materials that not only feel right aesthetically, but also perform demonstrably in practice.<img src="https://photo-assets.superyachttimes.com/photo/378026/image/large-e1d52fec9f5b48e54ce4354cd6459c91.jpg" data-gid="gid://syiq/Photo/378026"> As CEO, how do you see the future of&nbsp;<a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a>?The COVID period pushed many businesses into short-term, crisis-driven thinking and disrupted the relationship-building that normally underpins innovation. Now, in 2026, we can once again focus on long-term strategy. My focus is on innovation and striving to have a continuous process. At <a data-gid="gid://syiq/Company/7672" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Bolidt (Company)">Bolidt</a>, that means an extended horizon and we talk about thinking 500 years ahead – not because it’s literally achievable, but because it shapes how we make decisions today. That mindset encourages durability, adaptability and responsibility in everything we develop.Finally, we are very excited about showing people all the innovative things we can achieve as a company and so we’ve built a two-storey Experience Centre of 4,000-square-metres where architects, designers, and industry professionals can see what’s technically possible. We’re keen to actively challenge the industry’s thinking and we want people to engage, question assumptions, and reimagine what’s possible with decking.

Rientz Willem Bol Bolidt CEO

Georgia Tindale sits down with Bolidt CEO Rientz Willem Bol to discuss about the synthetic decking specialist projects and future plans.

CEO in Conversation: Rientz Willem Bol of Bolidt

Which cities can truly claim that their ports are as old as the cities themselves? Hamburg is one of the few. Its maritime heritage permeates every corner, thanks in large part to Hermann Blohm and Ernst Voss.<img src="https://photo-assets.superyachttimes.com/photo/388030/image/large-2b7a5af8e354717e8822a2c8e928c86f.jpg" data-gid="gid://syiq/Photo/388030">The two German entrepreneurs, whose names still proudly brandish the shiplifts that define Hamburg’s skyline, founded <a data-gid="gid://syiq/Company/3" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Blohm & Voss GmbH (Company)">Blohm &amp; Voss</a> in 1877. They chose the island of Steinwerder to establish what would become a 451,000-square-metre shipbuilding operation – roughly the size of the Vatican City. Initially focused on ship repair, <a data-gid="gid://syiq/Company/3" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Blohm & Voss GmbH (Company)">Blohm &amp; Voss</a> prepared commercial ships for the Atlantic passages before the company started building its own vessels. Today, Steinwerder operates under the custodianship of <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a> and has returned to its core principles: refit and repair.Specialising in complex refit programmes for private yachts, <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a> Werft Hamburg has maintained Steinwerder’s legacy of being one of the world’s most trusted ports of call for refits. The yard also continues Hamburg’s tradition as a free-flowing hub of maritime knowledge, where expertise is shared across teams, suppliers, and partners.&nbsp;This open-source approach to expertise gives the crew a unique opportunity to learn directly from the wider supply network. When suppliers and technical partners converge in one place, crew gain insight into often-overlooked nuances, ensuring optimal understanding for vessel longevity. Training is regular, problems are solved collaboratively, and the collective intelligence of Hamburg’s maritime ecosystem is fully accessible. The city itself – just a road tunnel away from the shipyard – offers cultural events, international dining, and green spaces along the Elbe, rather than an isolated shipyard town."An effective yacht refit or repair does not necessarily require a shipyard appointment," says York Ilgner, Managing Director of <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a> Werft Hamburg. "Smaller details can often be addressed at sea, at anchor, or at layberth with the right knowledge. As part of our service, we aim to impart as much expertise as possible so the crew can operate self-sufficiently. Our phones, of course, remain open when additional support is needed."Informal networks, however valuable, can be fragile when reliant on chance encounters or individual relationships. To address this, <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a> has formalised initiatives such as its annual Chief’s Day. The second edition, held recently in Hamburg, brought together more than 80 chief engineers, suppliers, partners, and management teams for a day of technical exchange. From innovations in stabilisation systems to advances in propulsion efficiency, the event brought forward many voices too often absent from strategic conversations. <img src="https://photo-assets.superyachttimes.com/photo/388029/image/large-3c5dccff002b180b0640f9c5554baf40.jpg" data-gid="gid://syiq/Photo/388029">Over the course of the day, one theme surfaced repeatedly: institutional memory. The big question is just how much data should be recorded, and what benefits this brings to ensure seamless maintenance. Which metrics truly predict issues before they escalate? How can maintenance histories transfer between teams without overwhelming them? The difference between a reactive refit and a strategic one often lies in whether previous lessons are learned or lost.Shipbuilding has shaped the identity of Hamburg for more than eight centuries, and <a data-gid="gid://syiq/Company/23" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lürssen Yachts (Company)">Lürssen</a> sustains its culture of maritime excellence. This culture develops through exchange, one conversation at a time. Hamburg remains what it has always been: a place where ships are built and repaired, and where the knowledge to do both better continues to evolve.

Inside Hamburg’s Steinwerder Shipyard: How Lürssen Continues the Blohm & Voss Refit Legacy

Hamburg's maritime heritage: How Lürssen keeps the Blohm & Voss legacy alive at Steinwerder Shipyard. 

Inside Hamburg’s Steinwerder Shipyard: How Lürssen continues the Blohm & Voss Refit legacy

The 49.8-metre <a data-gid="gid://syiq/Company/54" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Heesen Yachts (Company)">Heesen</a> superyacht <a data-gid="gid://syiq/Yacht/6105" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Daisy D49.8m (163'5&quot;)Heesen Yachts2018">Daisy D</a> sold in a deal with <a data-gid="gid://syiq/Company/1550" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Marine Marketing (Company)">Marine Marketing</a> introducing the buyer, alongside Nathan Farrelly of <a data-gid="gid://syiq/Company/124" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Edmiston (Company)">Edmiston</a> and <a data-gid="gid://syiq/Company/4795" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="One Brokerage Australia (Company)">One Brokerage Australia</a>. <img src="https://photo-assets.superyachttimes.com/photo/397051/image/large-5a5dce9decb30e6d016cb98d7fde34c4.jpg" data-gid="gid://syiq/Photo/397051">Delivered in 2018 as part of the <a data-gid="gid://syiq/Company/54" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Heesen Yachts (Company)">Heesen</a> 5000 Semi-Displacement series, <a data-gid="gid://syiq/Yacht/6105" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Daisy D49.8m (163'5&quot;)Heesen Yachts2018">Daisy D</a> features exterior design by <a data-gid="gid://syiq/Company/55" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Omega Architects (Company)">Omega Architects</a>, with interior design penned by <a data-gid="gid://syiq/Company/205" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Cristiano Gatto Design (Company)">Cristiano Gatto Design</a> and naval architecture by her Dutch builder <a data-gid="gid://syiq/Company/54" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Heesen Yachts (Company)">Heesen Yachts</a>.<a data-gid="gid://syiq/Yacht/6105" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Daisy D49.8m (163'5&quot;)Heesen Yachts2018">Daisy D</a> can comfortably accommodate up to 12 guests across a six stateroom configuration, with her master suite situated on the main deck forward, while her VIP suite, two doubles and two twin staterooms can be found on the lower deck.In terms of performance, <a data-gid="gid://syiq/Yacht/6105" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Daisy D49.8m (163'5&quot;)Heesen Yachts2018">Daisy D</a> is equipped with twin <a data-gid="gid://syiq/Company/1409" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="MTU (Company)">MTU</a> engines, which propel her to a top speed of 23 knots and a cruising speed of 12 knots. At the time of the sale, <a data-gid="gid://syiq/Yacht/6105" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Daisy D49.8m (163'5&quot;)Heesen Yachts2018">Daisy D</a> had a last known asking price of €28,500,000.&nbsp;

Daisy D: 50m Heesen yacht sold

The 49.8-metre Heesen superyacht Daisy D sold, with a last known asking price of €28,500,000.

50m Heesen superyacht Daisy D sold

The 30.48-metre <a data-gid="gid://syiq/Company/466" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Hatteras Yachts (Company)">Hatteras</a> motor yacht <a data-gid="gid://syiq/Yacht/4478" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sunday Money30.48m (100'0&quot;)Hatteras Yachts2001">Sunday Money</a> sold in a deal with Iain Lawrie of <a data-gid="gid://syiq/Company/322" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Merle Wood & Associates, Inc. (Company)">Merle Wood &amp; Associates</a> introducing the buyer and Michael Zaidan of <a data-gid="gid://syiq/Company/5149" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Borden and Associates Yacht Sales (Company)">Borden &amp; Associates Yacht Sales</a> representing the seller.<img src="https://photo-assets.superyachttimes.com/photo/397019/image/large-1adf3cf22ae9625acf3be275898f7595.jpg" data-gid="gid://syiq/Photo/397019">Delivered in 2001, <a data-gid="gid://syiq/Yacht/4478" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sunday Money30.48m (100'0&quot;)Hatteras Yachts2001">Sunday Money</a> features exterior design and naval architecture by <a data-gid="gid://syiq/Company/326" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Jack Hargrave (Company)">Jack Hargrave</a>. Spanning 180 GT, <a data-gid="gid://syiq/Yacht/4478" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sunday Money30.48m (100'0&quot;)Hatteras Yachts2001">Sunday Money</a> can comfortably accommodate up to 10 guests across a five stateroom configuration.&nbsp;In terms of performance, <a data-gid="gid://syiq/Yacht/4478" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sunday Money30.48m (100'0&quot;)Hatteras Yachts2001">Sunday Money</a> can reach a top speed of 24 knots and a cruising speed of 18 knots, thanks to twin <a data-gid="gid://syiq/Company/1497" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Detroit Diesel (Company)">Detroit Diesel</a> engines. At the time of her sale, <a data-gid="gid://syiq/Yacht/4478" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Sunday Money30.48m (100'0&quot;)Hatteras Yachts2001">Sunday Money</a> had a last known asking price of $1,450,000.(Image courtesy of Merle Wood &amp; Associates.)

Sunday Money: 31m Hatteras yacht sold

The 30.48-metre Hatteras motor yacht Sunday Money sold with a last known asking price of $1,450,000.

31m Hatteras motor yacht Sunday Money sold

Travelling to Sydney, Leona Caanen speaks with Luke Geelan, family man and owner of the&nbsp;<a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>&nbsp;fleet.Growing up with a passion for boating, and especially fishing, is Luke Geelan, Sydney native and owner of the 35.05-metre motor yacht <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>. Having spent most of his life around the water, it seems only natural for Luke to have moved into the world of boating. Overtime the yacht has come to resemble not only a connection to his past, but also to his future, getting to enjoy it with his family and friends, as well as sharing it with charter guests.<img src="https://photo-assets.superyachttimes.com/photo/388213/image/large-0b83e89d1054e69437b37ff303a35921.jpg" data-gid="gid://syiq/Photo/388213">A family passionGrowing up on a river in Sydney, Luke was introduced to the rhythms of tide and weather from an early age. “I’ve grown up with a passion for boating, my father taught me to water ski and sail as a young child” Luke shares. Over time, Luke exchanged sailing for wakeboarding and eventually game-fishing, depending his passion for being out at sea. This passion has remained a constant factor in Luke’s life, deepening even further once he could share it with his own kids.A few years ago, Luke sold his business and decided to step into boating in a more deliberate way by acquiring the 35-metre motor yacht <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>, built by <a data-gid="gid://syiq/Company/554" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lloyds Ships (Company)">Lloyd Ships</a> in Australia in 1986. Purchasing her in 2024, the yacht allowed for Luke and his family to explore the Australian coast with more comfort, as well as for them to get to share their passion for the sea. “My two boys are especially big on game fishing, and my daughter is very passionate about snorkelling and marine life”, says Luke. By acquiring <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>, it allows for the family to share their passions with one another.<img src="https://photo-assets.superyachttimes.com/photo/396937/image/large-131bb2f788c31defa0822382f533d318.jpg" data-gid="gid://syiq/Photo/396937">A three-part refitAs <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a> is from the 80s, she was in need of an upgrade when Luke purchased her. The refit has been phased and purposeful, with 2024 seeing the first of the three phases. The yacht spent September to November at the <a data-gid="gid://syiq/Company/3255" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Gold Coast City Marina & Shipyard (Company)">Gold Coast City Marina &amp; Shipyard</a> where the bridge was upgraded, soft furnishings replaced and extensive paintwork completed. <img src="https://photo-assets.superyachttimes.com/photo/388209/image/large-c74eb7958e3e321e611bea0e2d9fee9c.jpg" data-gid="gid://syiq/Photo/388209">The second phase was centred around remodelling the saloon, with new flooring, carpeting and ceilings, as well as mechanical enhancements. Other upgrades included a beach club installation, complete with an inflatable pool, protective netting and a shaded cabana, which has proved particularly popular with charter guests. Possibly the most meaningful addition during this refit have been the zero-speed stabilisers, “my wife suffers from really severe seasickness, the stabilisers are essential in making the yacht comfortable for my family,” Luke shares.<img src="https://photo-assets.superyachttimes.com/photo/388210/image/large-06ec6524534531dc1f3ac942dd743803.jpg" data-gid="gid://syiq/Photo/388210"><a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>’s third and final refit will take place in 2027 and will see an upgrade of the crew quarters. Originally, Luke had hoped to finalise the refit this year, but the yacht’s agenda, both in charter and personal use, is almost fully booked for the calendar year, and Luke wants to ensure there is enough time for the refit: “Our crew is so amazing, I'm super lucky to have what I believe is the best crew.<img src="https://photo-assets.superyachttimes.com/photo/388187/image/large-fde4622fb25e3e416358ace496ed0104.jpg" data-gid="gid://syiq/Photo/388187"><a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a>&nbsp;juniorYet the 35-metre motor yacht is only half the story. Six months after acquiring the mothership, Luke secured what he describes as Australia’s leading game fishing platform: a custom-built 17.7-metre (58’0”) Assegai sportfisher. Designed specifically for marlin fishing along the country’s east coast, the yacht is equipped with a gyro stabiliser and, more recently, a Furuno Omni Sonar System capable of scanning 360 degrees around the vessel to significant depths, providing a technological edge in a pursuit that still relies on instinct and patience.<img src="https://photo-assets.superyachttimes.com/photo/396954/image/large-96857bf8151cfcd655d86dc3d061d704.png" data-gid="gid://syiq/Photo/396954">The reason for acquiring the fishing vessel to cruise alongside the mothership are his sons. Luke shares that “my sons and I have been game fishing together for the last five years or so,” and have even partaken in various competitions in- and around Sydney. “We’ve won a couple of state titles and other competitions,” a hint of pride sits in Luke’s voice. “My children in particular, have a passion for fishing, and I've just shared that passion, and supported it”, he adds.Lukes really enjoys fishing with his family and friends, on a recent trip to the Great Barrier Reef, the Shore Thing 58' landed a 1,223 pound Black Marlin. Yet Luke is quick to note that they’re conscious about the way they fish. “We only catch what we eat; everything else goes right back in the ocean. We’re not hunters, we just fish for the joy of it.”<img src="https://photo-assets.superyachttimes.com/photo/388186/image/large-a98a34adf0095495d9e5f32f36eb458e.jpg" data-gid="gid://syiq/Photo/388186">The joy of cruisingSome of Luke’s most cherished moments onboard are those with friends and family. “We hosted my 50th birthday onboard,” Luke shares, having chartered the yacht to Whitehaven Beach, located in the Whitsundays, “there were about 40 guests, all friends and family.”&nbsp;Possibly Luke’s favourite memory is the recent Christmas holiday onboard. “Spending time with our family and another family, sitting around and just having deep belly laughs over some beautifully cooked meals by our chef onboard.” Luke describes this as delightful and quite possibly one of the most memorable times onboard. “Your kids grow up so quick, getting to share such a beautiful time together and feeling like, as your kids become young adults, that you can really share laughs and stories. It was just special.”<img src="https://photo-assets.superyachttimes.com/photo/396938/image/large-04bc34860fd9bc9b421321a8d9f42e09.jpg" data-gid="gid://syiq/Photo/396938">The beauty of being on a boat is that it ties everyone together, whether that is his own family and friends, or guests who charter the yacht, for Luke, the joy of owning <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a> lies in “getting to share the joy with other people.”The yacht and her fishing counterpart offer not just a sense of luxury, but a space for guests to create memories and experience the beauty of the Australian coastline as they cruise <a data-gid="gid://syiq/Yacht/3832" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Shore Thing35.05m (114'12&quot;)Lloyds Ships1986">Shore Thing</a> between the Great Barrier Reef, the Whitsundays and the Sydney Harbour.<img src="https://photo-assets.superyachttimes.com/photo/388177/image/large-2991a957e2fdb4ef0038789921600aa2.jpg" data-gid="gid://syiq/Photo/388177">

Owning the shore thing fleet 

A look inside Luke Geelan's charter fleet: his 35m Shore Thing and the 58' sport fisher chartering around Sydney.

"The joy of owning Shore Thing is getting to share it with others"

The fourth 53.25-metre <a data-gid="gid://syiq/Company/1821" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Damen Yachting (Company)">Damen Yachting</a> YS53 yacht support <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> has been delivered to her owner, following her launch in March 2026 from the <a data-gid="gid://syiq/Company/1821" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Damen Yachting (Company)">Damen Yachting</a> facility in Antalya, Turkey. <img src="https://photo-assets.superyachttimes.com/photo/397013/image/large-c33b6dbec1e5da99757b484375d47d5b.jpg" data-gid="gid://syiq/Photo/397013">Designed to operate either alongside a mothership or independently, <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> has been crafted in-house by her builder <a data-gid="gid://syiq/Company/1821" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Damen Yachting (Company)">Damen Yachting</a>, which were responsible for her interior, exterior and naval architecture.&nbsp;Created around family experiences, shared moments on the water and operational purpose <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> will now serve as a purposeful extension of her owner's fleet, where she has been developed to provide additional space, support and flexibility.<img src="https://photo-assets.superyachttimes.com/photo/397012/image/large-e7a8adfa9276e3affbe8d0454cf3c3d4.jpg" data-gid="gid://syiq/Photo/397012">"From the outset, &nbsp;there was a clear vision for how the owner wanted to use YS53 <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> and the role she would play within the fleet," explained Rob Dolling, Owner’s Representative. "Together with Damen Yachting, we were able to translate those wishes into a vessel that is highly functional, personal and closely aligned with the owner’s programme."<a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> can comfortably accommodate up to eight guests, as well as 10 crew plus her captain. Her interior reflects the owner’s personal style, combining timeless elegance with Old English influences throughout. <img src="https://photo-assets.superyachttimes.com/photo/397011/image/large-c5c4c4fd9fd1617d2fa194c1f00b061d.jpg" data-gid="gid://syiq/Photo/397011"><a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> boasts the brand’s signature axe bow, while her reinforced deck supports touch-and-go helicopter operations. With a generous open main deck of more than 200 square-metres, this versatile space can be used for large tenders, toys and specialised equipment.This is complemented by a 15-tonne crane, enabling the handling of substantial tenders and heavy loads. With a volume just shy of 500 GT, she can accommodate up to eight guests, along with a crew of eight.<img src="https://photo-assets.superyachttimes.com/photo/397010/image/large-d904abeb9d80368dab56f223768c6958.jpg" data-gid="gid://syiq/Photo/397010">"As the fourth Yacht Support 53 delivered by <a data-gid="gid://syiq/Company/1821" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Damen Yachting (Company)">Damen Yachting</a>, she reflects the versatility of the Yacht Support range within modern superyacht ownership and has been created with a very clear purpose," concluded Jan van Hogerwou, Commercial Executive USA.Crafted with a steel hull and aluminium superstructure, <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> is powered by twin <a data-gid="gid://syiq/Company/1409" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="MTU (Company)">MTU</a> engines, which provide her with a cruising speed of 12 knots and a top speed of 19 knots. Once her sea trials are complete, <a data-gid="gid://syiq/Yacht/13202" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Rafter53.25m (174'8&quot;)Damen Yachting2026">Rafter</a> will prepare for delivery to her owner. &nbsp;

Rafter: Fourth Damen Yachting YS53 yacht on sea trials

The fourth 53.25-metre Damen Yachting YS53 yacht support Rafter has been delivered following her launch in Antalya, Turkey in March 2026.

Fourth Damen Yachting YS53 yacht support Rafter delivered

<a data-gid="gid://syiq/Company/895" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lusben Shipyard (Company)">Lusben</a> has completed the refit of the 37-metre <a data-gid="gid://syiq/Company/212" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Benetti SpA (Company)">Benetti</a> Classic 120 yacht <a data-gid="gid://syiq/Yacht/1886" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Kos37.5m (123'0&quot;)Benetti SpA2009">Kos</a>, following a comprehensive programme of works spanning structural modifications, onboard systems, technical upgrades, exterior areas and interiors. <img src="https://photo-assets.superyachttimes.com/photo/396976/image/large-40153e77114e1432e88b74a33b05ac53.jpg" data-gid="gid://syiq/Photo/396976">Built in 2009 by <a data-gid="gid://syiq/Company/212" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Benetti SpA (Company)">Benetti</a>, <a data-gid="gid://syiq/Yacht/1886" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Kos37.5m (123'0&quot;)Benetti SpA2009">Kos</a> forms part of its Classic 37 series, featuring exterior design by <a data-gid="gid://syiq/Company/254" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Stefano Righini Design (Company)">Stefano Righini Design</a>, interiors by <a data-gid="gid://syiq/Company/67" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Zuretti Interior Design (Company)">Zuretti Interior Design</a> and naval architecture developed in-house by her builder.The refit of <a data-gid="gid://syiq/Yacht/1886" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Kos37.5m (123'0&quot;)Benetti SpA2009">Kos</a> commenced in August 2025 shortly after the yacht was acquired by her new owner and was completed in approximately six months through the coordinated efforts of <a data-gid="gid://syiq/Company/895" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lusben Shipyard (Company)">Lusben</a>'s project management team, specialised technicians, skilled craftsmen and interior designer Laura Rossi. According to <a data-gid="gid://syiq/Company/895" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lusben Shipyard (Company)">Lusben</a>, the programme was undertaken with the aim of improving operational efficiency, enhancing the onboard experience and extending the yacht's service life.<img src="https://photo-assets.superyachttimes.com/photo/397008/image/large-c77ef9362600c70fc7acbd85faee16f2.jpg" data-gid="gid://syiq/Photo/397008">From the outset, the owner and project team sought to preserve the yacht's original layout and distinctive character while improving her functionality, comfort and the perception of space. On the main deck, the refit scope included the installation of new full-height windows in her main saloon alongside the reconfiguration of the staircase area between the main and upper decks.<img src="https://photo-assets.superyachttimes.com/photo/397007/image/large-91d720dd0c041da15a467ac85b61b3da.jpg" data-gid="gid://syiq/Photo/397007">Laura Rossi oversaw the interior redesign, introducing what <a data-gid="gid://syiq/Company/895" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lusben Shipyard (Company)">Lusben</a> described as "greater fluidity, brightness and visual continuity." A new transparent balustrade around the staircase would allow natural light to flow between decks, while satin-finish glass panels replaced selected opaque surfaces in the corridors. New fabrics and materials were also integrated throughout the guest accommodations to enhance comfort, durability and ease of maintenance.<img src="https://photo-assets.superyachttimes.com/photo/397009/image/large-f3728f4818fd2bd0f7063bd374fc9a4e.png" data-gid="gid://syiq/Photo/397009">"<a data-gid="gid://syiq/Yacht/1886" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Kos37.5m (123'0&quot;)Benetti SpA2009">Kos</a> does not deny what she has been, nor does she try to become something else," commented Rossi. "The project was conceived to lighten, simplify and enhance the yacht's original identity, creating spaces that are brighter, more fluid and more natural to experience every day."<img src="https://photo-assets.superyachttimes.com/photo/397006/image/large-04998d04550196299f04c73e269ea5f1.jpg" data-gid="gid://syiq/Photo/397006">In addition to the living areas, <a data-gid="gid://syiq/Company/895" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Lusben Shipyard (Company)">Lusben</a> carried out a myriad of technical upgrades involving the main engines, generators and essential onboard systems. The entire lighting system was replaced with energy-efficient LEDs, while the bridge and onboard electronics were updated to make them easier to use and improve navigation safety. Exterior works included restoring the teak decks, reconfiguring the sundeck after removing the existing Jacuzzi and completely repainting the hull and superstructure.&nbsp;

Lusben completes refit of 37m Benetti yacht Kos

Lusben has completed an extensive refit of the 37m Benetti Classic yacht Kos.

37m Benetti yacht Kos completes extensive refit at Lusben

The 25.75-metre <a data-gid="gid://syiq/Company/130" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonen Yachts (Company)">Moonen</a> motor yacht <a data-gid="gid://syiq/Yacht/7631" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moon River 25.75m (84'6&quot;)Moonen Yachts2003">Moon River</a> sold in a deal with David Legrand of <a data-gid="gid://syiq/Company/158" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Fraser (Company)">Fraser</a> introducing the buyer and Derk Jan Rolff of <a data-gid="gid://syiq/Company/5652" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Holland Yacht Connection (Company)">Holland Yacht Connection</a> representing the seller. <img src="https://photo-assets.superyachttimes.com/photo/346966/image/large-acba5ebb2d4596b138324b59ae61deb9.png" data-gid="gid://syiq/Photo/346966">Delivered in 2003 as part of the Moonen 84 series, <a data-gid="gid://syiq/Yacht/7631" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moon River 25.75m (84'6&quot;)Moonen Yachts2003">Moon River</a> features exterior design by <a data-gid="gid://syiq/Company/240" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Marimecs BV (Company)">Marimecs</a>, interior design penned in-house by <a data-gid="gid://syiq/Company/130" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moonen Yachts (Company)">Moonen Yachts</a> and naval architecture by <a data-gid="gid://syiq/Company/241" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="René van der Velden Yacht Design (Company)">René van der Velden Yacht Design</a>.Spanning 115 GT, <a data-gid="gid://syiq/Yacht/7631" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moon River 25.75m (84'6&quot;)Moonen Yachts2003">Moon River</a> can comfortably accommodate up to eight guests across a four stateroom configuration on the lower deck, with her full-beam master suite situated amidships, alongside a VIP at her bow and two twin staterooms.&nbsp;In terms of performance, <a data-gid="gid://syiq/Yacht/7631" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moon River 25.75m (84'6&quot;)Moonen Yachts2003">Moon River</a> is powered by twin <a data-gid="gid://syiq/Company/1408" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Caterpillar Inc (Company)">Caterpillar</a> engines, which provide her with a top speed of 12 knots and a cruising speed of 11 knots. At the time of her sale, <a data-gid="gid://syiq/Yacht/7631" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Moon River 25.75m (84'6&quot;)Moonen Yachts2003">Moon River</a> had a last known asking price of €2,200,000.&nbsp;(Image courtesy of Holland Yacht Connection.)

Moon River: 26m Moonen yacht sold

The 25.75-metre Moonen motor yacht Moon River sold with a last known asking price of €2,200,000.

26m Moonen motor yacht Moon River sold

As contemporary superyacht design continues to prioritise light, openness and seamless connections to the sea, glass has evolved from a purely functional element into a defining aesthetic feature and, with the use of significantly larger glass panels, has become an essential structural component. Expansive glazing now shapes not only the visual identity of a yacht but also its engineering framework, requiring a far more integrated and technically rigorous approach.For German specialist <a data-gid="gid://syiq/Company/3829" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="TILSE Glass (Company)">TILSE</a>, this shift represents both an opportunity and a responsibility – to ensure that increasingly ambitious designs are matched by uncompromising structural integrity, durability and precision.<img src="https://photo-assets.superyachttimes.com/photo/293944/image/large-ecdb75ea245212d313561b3fadf7f87c.jpg" data-gid="gid://syiq/Photo/293944">Integrating glass from the concept stageLarger glass surfaces have fundamentally changed how glazing is approached in yacht construction. No longer a late-stage addition, glass must be embedded into the superstructure concept from the earliest design phases, with engineers analysing how forces move through the pane, adhesive bond and surrounding structure.Unlike static architectural environments, yachts operate under continuous dynamic loads, with hull flex, vibration and thermal variation all influencing performance. Safety margins must therefore reflect real marine conditions, while thickness, laminate composition, bonding strategy, edge detailing and installation methodology all need to be considered from the outset.Early collaboration is essential. By working with designers and naval architects at the concept stage, <a data-gid="gid://syiq/Company/3829" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="TILSE Glass (Company)">TILSE</a> helps ensure that visual ambitions are achievable without compromising technical feasibility, long-term serviceability or structural integrity. This proactive approach allows glazing to do more than fit within a design – it helps shape the structural logic of the vessel, balancing elegance with engineering robustness.<img src="https://photo-assets.superyachttimes.com/photo/286853/image/large-74c88213b1c3eba82cf06fc659c13e71.jpg" data-gid="gid://syiq/Photo/286853">Bonding as a safety-critical interfaceOne of the most significant technical challenges is bonding glass – which is inherently brittle – to aluminium or steel structures that move, flex and expand differently under load and temperature change. The adhesive joint must do more than hold the panel in place: it must accommodate movement, transfer loads safely and maintain integrity under UV exposure, salt, humidity and vibration.“The real challenge is not only the glass pane itself, but the interface between glass and a structure that is constantly moving at sea.”As panel sizes increase, this interface becomes even more critical, since minor mismatches in movement, geometry or application can have amplified consequences. Bond thickness, surface preparation, laminate compatibility and UV protection must therefore be precisely controlled. In superyacht glazing, adhesive design is not a detail – it is part of the safety concept, and a well-engineered bond line underpins both structural integrity and long-term durability.Simulation and real-world performanceFinite Element analysis helps validate glass performance, particularly in complex or non-standard applications, by modelling the interaction between glass, adhesive and supporting structure under realistic marine loads. This allows engineers to identify stress points, optimise designs and support conditions, and mitigate deflection risks early in the project lifecycle.Unlike building façades, yacht structures are subject to continuous movement, making accurate modelling essential. Long-term factors such as moisture ingress, ageing and laminate degradation must also be assessed, as they can directly affect load-bearing capacity.As glass panels grow in size, tolerances become increasingly critical. Millimetre-level deviations in shaping or installation can influence load distribution and compromise both structural performance and visual alignment. Handling and installation of large panes have therefore become technical operations in their own right, requiring precise three-dimensional measurement and meticulous execution.<img src="https://photo-assets.superyachttimes.com/photo/333152/image/large-73662ca86854e3909e622abf8863c6a4.jpg" data-gid="gid://syiq/Photo/333152">Ensuring long-term laminate integrityLong-term durability begins with material selection. Because traditional PVB interlayers, which are widely used, can be vulnerable to humidity and temperature fluctuations, <a data-gid="gid://syiq/Company/3829" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="TILSE Glass (Company)">TILSE</a> uses a specially developed resin interlayer designed for enhanced moisture resistance at sea, thereby preventing delamination.Chemical toughening further improves optical clarity, reduces distortion and avoids the anisotropy often associated with thermally toughened glass. Strict quality control from raw material selection to lamination, sealing and final inspection ensures each pane meets superyacht standards.Consistency in bespoke productionFor bespoke glazing, consistency depends on rigorous process control across the entire project chain, from early consultation and three-dimensional measurement through to production and installation. <a data-gid="gid://syiq/Company/3829" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="TILSE Glass (Company)">TILSE</a>’s integrated approach reduces variability and ensures consistency across the entire project chain, even when each pane is uniquely specified.Combined with stringent inspection protocols and a commitment to rejecting substandard components, this enables the delivery of reliable, high-performance glazing systems.Engineering next-generation glazingLooking ahead, the trajectory of superyacht design points towards even larger, clearer and more seamlessly integrated glass surfaces. However, the next phase of innovation will be defined not by scale alone, but by the ability to balance ambition with practicality. Manufacturability, optical quality, structural safety, durability and ease of replacement will all play an increasingly important role in shaping future designs.As glass cements its position as a defining element of modern yacht design, its successful application depends on far more than aesthetics. Structural integration, bonding expertise, advanced simulation and uncompromising material quality must come together from the very beginning.In response, <a data-gid="gid://syiq/Company/3829" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="TILSE Glass (Company)">TILSE</a> continues to invest in expanded production capacity, advanced handling capabilities and earlier involvement in complex projects – helping today’s most ambitious glazing concepts to be realised safely, durably and with the clarity expected of the next generation of superyachts.

Tilse yacht glass in design

Larger glass surfaces have fundamentally changed how glazing is approached in yacht construction. 

Engineering transparency: The evolving role of glass in superyacht design

<img src="https://photo-assets.superyachttimes.com/photo/396837/image/large-d8ba973efacc6a431309d036f5b1a3df.jpg" data-gid="gid://syiq/Photo/396837">The 95-metre <a data-gid="gid://syiq/Company/778" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Golden Yachts Ltd. (Company)">Golden Yachts</a> superyacht <a data-gid="gid://syiq/Yacht/7237" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="O'Pari95.0m (311'8&quot;)Golden Yachts Ltd.2020">O’Pari&nbsp;</a>was recently seen anchored in Athens, Greece, ahead of Posidonia 2026. Several other superyachts, including the 60.98-metre <a data-gid="gid://syiq/Yacht/13282" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="O'Madeleine60.98m (200'1&quot;)Golden Yachts Ltd.2025">O'Madeleine</a>, were also spotted in the area during the international shipping exhibition, which took place from 1 to 5 June.Delivered in 2020, <a data-gid="gid://syiq/Yacht/7237" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="O'Pari95.0m (311'8&quot;)Golden Yachts Ltd.2020">O’Pari&nbsp;</a>remains the largest yacht built by the Greek shipyard to date. She forms part of a fleet of distinctive <a data-gid="gid://syiq/Company/778" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Golden Yachts Ltd. (Company)">Golden Yachts</a> projects, alongside notable vessels such as the 87.6-metre <a data-gid="gid://syiq/Yacht/2354" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Project X87.6m (287'5&quot;)Golden Yachts Ltd.2022">Project X</a> and the 77.7-metre <a data-gid="gid://syiq/Yacht/11076" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Malia77.7m (254'11&quot;)Golden Yachts Ltd.2023">Malia</a>, which was launched in 2023.Her exterior and interior design were penned by <a data-gid="gid://syiq/Company/76" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Studio Vafiadis (Company)">Studio Vafiadis</a>. Spanning 2,700 GT, <a data-gid="gid://syiq/Yacht/7237" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="O'Pari95.0m (311'8&quot;)Golden Yachts Ltd.2020">O’Pari</a> offers a range of standout amenities, including a touch-and-go helipad positioned on the forward upper deck, an expansive sundeck complete with a DJ booth, bar and Jacuzzi, and a dedicated wellness area featuring a massage room, Turkish hammam and Finnish sauna.Accommodation is provided for guests across a collection of marble- and mosaic-clad staterooms, comprising nine double cabins and four twin cabins.Powered by twin <a data-gid="gid://syiq/Company/1408" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="Caterpillar Inc (Company)">Caterpillar</a> engines, <a data-gid="gid://syiq/Yacht/7237" href="#managed-by-system" rel="noopener noreferrer" target="_blank" title="O'Pari95.0m (311'8&quot;)Golden Yachts Ltd.2020">O’Pari</a> cruises comfortably at 16 knots and can reach a top speed of 20 knots. She is currently en route to Split, Croatia, according to AIS Data.

Golden Yachts yacht O’Pari in Athens

The 95-metre Golden Yachts superyacht O’Pari was recently seen anchored in Athens, Greece.

95m Golden Yachts superyacht O’Pari in Athens