Over its 40-year history, Heesen has developed a reputation for building cutting-edge superyachts that have pushed boundaries in design, speed and efficiency. From record-breakers such as Octopussy to more recent innovators such as Galactica Star, Galactica Supernova and Home, Heesen’s facility in Oss continues to play host to remarkable superyacht projects.
The latest project to draw on this extraordinary heritage is Cosmos, an 80.7 metre aluminium superyacht that is set to push the boundaries even further. With a designed top speed close to 30 knots and an efficient cruising speed in excess of 20 knots, Cosmos will use a development of the Fast Displacement Hull Form (FDHF) coupled with innovative construction and advanced propulsion solutions to set new standards for large aluminium yachts. Although the keel-laying ceremony is due to take place later this year in May, this is not the start of the project – indeed, an extraordinary amount of design and testing has already been undertaken and completed.
The proof-of-concept and testing process has comprised several stages, starting with the base naval architecture of the vessel and its hull form, progressing through extensive computational fluid dynamics (CFD) work and physical tank testing of a scale model, and culminating with the design of the propellers and rudder system. For these aspects, Heesen has drawn not only on the expertise of its in-house design and engineering department but also that of long-standing partners Van Oossanen Naval Architects, and propulsion specialists at Rolls-Royce.
The first stage was to develop the FDHF concept and ensure not only that Cosmos benefitted from the efficiency and speed gains of the design, but also that the yacht could retain inherent stiffness – a challenge because Cosmos features all-aluminium construction in order to achieve the client’s desired maximum speed of close to 30 knots. The solution was for Heesen to develop the Backbone® – a method of construction that could deliver the required stiffness in the yacht without adding weight that would have impacted on the yacht’s performance. Such has been the success of the design that the Backbone® has now been patented.
A 3.7m scale segmented model of the yacht was built to use in physical tank tests at the Wolfson Unit in Southampton. After initial data on hydrodynamics, resistance and speed had been gathered, the model has been radio-controlled and self-propelled in order to measure the various bending forces acting within the hull and to prove the Backbone® concept. That provided valuable data for fine-tuning the structural design and to further optimise the construction method.
For such a large aluminium yacht, it is particularly important to know the real forces created by the sea on the hull, not just to meet Lloyd’s Register requirements but to exceed those and construct the boat to the highest loads that could be encountered.
Using the FDHF design and the Backbone® for such a large aluminium yacht requires a slightly deeper keel depth, but this actually brings further benefits. Due to the slightly increased draft Project Cosmos has a very low block coefficient, which means that the underwater body is very slim with nice verticals in the aft ship area, for an optimal flow of water towards the propellers. This results not only in improved performance but also in higher efficiency, ensuring fast cruising with comparatively low fuel consumption.
Refining the propeller design is the ongoing job of research and design engineers at Rolls-Royce. Alongside the propeller design itself, the Promas system – where propeller and rudder are integrated into a single unit to optimise hydrodynamic efficiency – has been implemented in the design.
Rolls-Royce engineers started by gathering CFD information of the water flow towards the propeller. Then the design process began with Rolls-Royce proprietary software: different iterations of propeller and rudder design were tried before arriving at the optimal solution, which was then tested in physical experiments.
By creating a 1:11 scale model of the Promas rudder and propeller in the test tank facilities of the Rolls-Royce Hydrodynamic Research Centre (HRC) in Kristinehamn, Sweden, the propeller design was fine-tuned not only to ensure the speed and efficiency requirements are met, but also that any potential problems with cavitation can be eliminated. Cavitation is essentially where air bubbles form in the flow of water around and behind the propeller. It is particularly challenging at high speed, and as well as affecting performance it can also have severe impacts on noise and vibration – a critical consideration for any superyacht project, especially for one close to 30 knots! Cavitation issues were identified and eliminated by adjusting the rudder design. Finally, the tests proved that the propeller performed above expectations.
Project Cosmos will feature variable pitch propellers that will enable the yacht to handle both impressive cruising speeds in excess of 20 knots, as well as reaching a maximum speed close to 30 knots – a considerable achievement for an 80-metre superyacht. With the hull design optimised, the construction engineering finalised and the propulsion system going through the last stages of testing, Cosmos is already proving a milestone project for Heesen and the teams involved.
“Project Cosmos is raising the bar once again not only for Heesen, but for custom aluminium yacht building in general,” says Arthur Brouwer, CEO of Heesen. “Both from a technical standpoint and from a performance point of view we are pushing boundaries. Not only has this 80.7m project been designed to reach close to 30 knots, she has been designed for fast, 20+ knots cruising in an efficient manner. The solutions we have implemented to meet all these requirements are once again driving superyachting forward – just as Heesen has done with innovative and ground-breaking projects throughout its 40-year history.”
Damen Yachting has commenced sea trials for its latest 53-meter Yacht Support vessel at its Antalya facility, following the yacht's launch last month. The trials mark the final phase before the vessel's scheduled completion in summer 2025.This represents the third unit of the YS53 model, following the 2024 deliveries of Bad Company Support 175 and Five Oceans. The YS53 series targets owners requiring multifunctional support vessels, featuring an axe bow design for improved seakeeping and high bow construction for deck protection.Project Manager Pim Oostra stated: "We are delighted this YS53 has started sea trials, an important step toward summer completion." The Antalya shipyard continues work on final outfitting during the testing period.Damen Yachting has delivered over 20 support vessels across its Yacht Support range. The YS53's design emphasizes operational reliability, with an aft deck configured for various tender and equipment deployments. No client details or delivery destination were disclosed for this third hull.The vessel's technical specifications remain consistent with previous YS53 models, though Damen hasn't confirmed whether this unit includes custom modifications. The sea trials will evaluate performance parameters ahead of the scheduled summer handover.Damen Yachting, a division within the Damen Shipyards Group, was created in 2019. The division combines the pedigree and heritage of Amels yachts with a growing portfolio of SeaXplorer yachts and Yacht Support vessels.Credits: Damen Yachting
May 21, 2025
Vripack has completed the interior concept for Burger Boat Company's new 55-meter superyacht, drawing on their 25-year collaboration with the Wisconsin shipbuilder. The design emphasizes natural materials, functional storage solutions, and adaptable lighting schemes for the custom-built vessel.The interior scheme features American walnut flooring and ceilings throughout, complemented by Calacatta Gold and Dark Emperador marble in guest bathrooms. Vripack prioritized maintaining sightlines through large picture windows while incorporating discreet storage units, particularly in the main salon. "Floor-to-ceiling windows are important, but shouldn't sacrifice functionality," said Vripack co-creative director Bart Bouwhuis.Lighting design forms a key element, with layered illumination including sconces, mini spots, and underlighting to transition from daytime to evening ambiance. The owner's stateroom employs a lighter color palette with customizable artwork displays, while guest areas feature Poltrona Frau furniture including Archibald armchairs.Storage solutions were expanded across all decks, addressing a common owner priority. The design maintains what Bouwhuis describes as "an easy-going foundation" with textured fabrics by Dedar and high-gloss finishes adding visual richness. Loose furniture selections include a Poliform Westside coffee table in the main saloon.The project continues Vripack's longstanding partnership with Burger, having previously collaborated on yachts including the mahogany-clad Ingot and the Slide Hull-equipped Burger 50 Cruiser. No delivery date was specified for the 180' model, which represents Burger's contemporary approach to custom yacht building.Vripack's design targets what Bouwhuis identifies as the typical Burger owner's priorities: "A vessel that's practical, comfortable, and tailored to their specific desires." The studio balanced aesthetic considerations with maintenance requirements and durability for extended cruising use.The Burger 180' interior marks another American-European collaboration for the Dutch designers, who have increasingly focused on storage optimization and transitional lighting schemes in recent superyacht projects. The yacht's technical specifications and propulsion details remain undisclosed at this stage of construction.Vripack is a yacht-design studio with a portfolio that represents over 7400 designs, made strong through its extensive naval architecture and engineering experience. From the moment they opened their doors in 1961, Vripack studio’s approach to design has been governed by the playful interaction between form and function.Credits: Vripack
May 21, 2025
Electric yacht builder Sialia Yachts has named Marco Plicchi as its new Chief Operating Officer. The appointment strengthens the company's leadership team as it prepares to launch its fully electric Sialia 45 model in June 2025.Sialia 45Plicchi brings 25 years of marine industry experience to the Polish shipyard, having previously held senior operations roles at several luxury yacht manufacturers. As COO, he will oversee production processes, new product development, and quality control across Sialia's range of 13-30 meter electric yachts.Marco PlicchiThe naval architect's immediate focus will be operational efficiency improvements as Sialia completes its 45-foot flagship model. The Sialia 45 claims class-leading range and a 43-knot top speed ahead of its scheduled debut at the Cannes Yachting Festival in September 2025.Sialia 57 Deep SilencePlicchi's technical background includes implementing production systems, managing sea trials, and developing after-sales service programs. His appointment follows Sialia's expansion under parent company Silent Straits Group, though no organizational changes were announced beyond the COO position.Sialia 45The shipyard continues developing its zero-emission yacht portfolio, targeting the growing market for electric propulsion in the 40-100 foot segment. No production volume targets or new model announcements were disclosed alongside the executive appointment. Plicchi will assume operational responsibility immediately as Sialia prepares for its Cannes showcase.Credits: Sialia Yachts
May 21, 2025
The Custom Line 50 superyacht has received the Miglio Blu Design Award 2025 in the "Living Innovation" category. The 50-meter aluminum yacht was recognized for its revolutionary interior layout during the Blue Design Summit in La Spezia.Judges highlighted the yacht's dedicated owner's deck featuring a 75-square-meter suite with private terrace, natural lighting solutions, and separated crew/guest circulation for privacy. The award acknowledges Custom Line's approach to combining aesthetic innovation with functional design in the semi-custom segment.The Ferretti Group brand continues to emphasize owner-centric layouts across its model range. The Custom Line 50 remains available for order through the company's global dealer network, though pricing and delivery timelines were not disclosed. This marks the third consecutive year a Ferretti Group product has received recognition at the Italian design awards.The Ferretti Group, led by Chief Executive Officer Alberto Galassi, is now one of the world’s leaders in the construction and sale of luxury yachts and pleasure vessels, with a unique portfolio of brands: Ferretti Yachts, Riva, Pershing, Itama, Mochi Craft, CRN, Custom Line and Wally.Credits: Ferretti Group
May 20, 2025
Italian shipyard CRN has handed over the 67-meter superyacht Amor à Vida to its owner following successful sea trials. The steel and aluminum vessel, previously known as Project Maranello, departed CRN's Ancona facility in early May for its maiden Mediterranean voyage.The six-deck yacht features exterior styling by Nuvolari Lenard and interior design by Valentina Zannier, developed in collaboration with the owner. Moran Yacht & Ship represented the owner throughout the construction process, overseeing technical evaluations and project coordination. Accommodation includes an owner's suite on the upper deck, a convertible VIP suite on the main deck, and five guest cabins on the lower deck, with a total capacity for 12 guests.Amor à Vida incorporates a hybrid propulsion system with two MTU 12V4000 M63 engines, achieving IMO Tier III emissions certification. The yacht reaches a maximum speed of 16 knots with a cruising speed of 15 knots. An advanced heat recovery system improves energy efficiency by repurposing waste heat for the yacht's pools and plumbing network.CRN's project team worked closely with the owner's representatives and subcontractors to execute the custom design, which emphasizes fuel efficiency through its hybrid power management. The delivery follows the 2024 launch of CRN's 72-meter Cloud 9 and precedes several scheduled 2025 completions at the Ancona shipyard. No construction timeline or cost details were disclosed.The yacht's delivery marks another full-custom project completion for CRN, continuing the Ferretti Group subsidiary's focus on bespoke superyacht construction. Amor à Vida will spend its inaugural season cruising Mediterranean destinations before potentially appearing at fall boat shows.The Ferretti Group, led by Chief Executive Officer Alberto Galassi, is now one of the world’s leaders in the construction and sale of luxury yachts and pleasure vessels, with a unique portfolio of brands: Ferretti Yachts, Riva, Pershing, Itama, Mochi Craft, CRN, Custom Line and Wally.Credits: Ferretti Group
May 20, 2025