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.”
Spanish studio Daroca Design has introduced Real, an 80-metre yacht concept developed as part of Oceanco’s Simply Custom collection. This approach allows clients to begin with a proven platform by Lateral Naval Architects, then customise both the exterior and interior.According to designer Alejandro Crespo, Real is a “true reflection of a desire for sleek minimalism and perfect proportions,” with an exterior intended to “integrate into the natural landscape.” The design features flowing lines, curved superstructure details, and glass bulwarks. A beach club includes two pools and direct water access via a swim platform. The concept also shows generous lounging areas, a helipad at the bow, and white furnishings for a contemporary look.Crespo describes Real as “a symbol of sincerity and distinction,” designed for both calm coastlines and open waters, with the goal of reconnecting with nature, family, friends, and “the beauty of life.”The Simply Custom designs incorporate advanced technical elements such as optimised stabilisation, pod drives, electric propulsion, and onboard battery storage. Oceanco states that the platform supports renewable diesel fuels like HVO, which can reduce carbon emissions by 80 to 90 per cent compared to standard marine diesel.Real’s unveiling follows the introduction of other Simply Custom concepts, including North West Boatworks’ Aurora earlier in the month.Credit: Daroca Design
December 20, 2024
Aiata, a brand entering the boating market under the Turkish conglomerate Anadolu Group, will make its global debut at Boot Düsseldorf 2025. The show, held from January 18 to January 26, 2025, attracts over 250,000 visitors and more than 1,900 exhibitors worldwide. Aiata will present the Wayfinder 38 in three variations: Cabin, Open, and a specialized Fishing configuration derived from the other two models.The Wayfinder 38 is a 25-foot outboard walkaround designed by Finnish designer Jarkko Jämsén. Aiata states that this model “stands for flexibility, comfort and craftsmanship.” The Cabin version includes a wheelhouse layout with an L-shaped salon, integrated galley, Webasto sunroof, and air conditioning system. It offers teak furniture, a queen-size bed, an enclosed bathroom, and 2-meter ceilings. Its wheelhouse incorporates a lift-up mechanism connecting the interior and cockpit. The bow area features a U-shaped sofa with a hi-low table.The Open model is designed for a more outdoor experience, featuring a suntop and a continuous salon layout intended to create a seamless connection between interior and exterior spaces. Oak furniture complements the open deck.A Fishing configuration is also available, applicable to both Cabin and Open models. It includes a spacious foredeck sunbed and is described as ergonomic and intuitive, making it suitable for day cruises, watersports, or fishing activities. The Wayfinder 38 offers outboard engine options ranging from 300 to 425 horsepower.Yutkun TokYutkun Tok, General Manager of Aiata, said: “We are honored to participate in Boot Düsseldorf, a prestigious platform that celebrates the pinnacle of the boating world. The Wayfinder 38 embodies Aiata’s mission to deliver versatile, high-performance boats backed by the Anadolu Group’s legacy of innovation and excellence. For Aiata, this is a defining moment – not only because we are showcasing the Wayfinder 38, but because it reflects the expertise and unwavering commitment to quality that define the Anadolu Group. Aiata benefits from the financial strength and engineering excellence of Anadolu Group, ensuring every vessel we produce is a symbol of reliability, innovation, and craftsmanship. We look forward to sharing our passion for boating with enthusiasts from around the globe.”Credits: Aiata
December 20, 2024
Antonini Navi, established in 2020 by the Antonini Group in collaboration with engineer Aldo Manna, has announced the successful joining of the hull and superstructure for its Seamore 34 superyacht. According to the shipyard, “The steel hull was connected to the aluminum superstructure using bimetal,” and with this phase completed, the focus will now shift to the vessel’s internal compartmentalization.Seamore 34, featuring design and development by Hot Lab, is the first model in a “semi-custom” series scheduled for launch in the second half of 2025. The yacht’s profile is described as having “a high, dominant bow” that gives it a “sleek and sporty feel,” combined with superstructure volumes that result in “an elegant, maritime look.” The concept prioritizes versatility and flexibility, as well as open spaces that “create unique settings for sharing and conviviality among guests.”The shipyard states: “One of the most interesting features of Seamore 34 is the more than 150-square-meter open-air living space on the main deck, much of which can be closed off if needed by sliding pocket windows fitted flush with the deck.”At the current stage of construction, potential buyers, captains, and brokers can arrange onboard visits. These inspections, guided by engineers from the shipyard’s technical office, provide industry professionals the opportunity to examine the yacht’s construction quality and design firsthand.The Pertusola shipyard in the Gulf of La Spezia was bought by Walter Antonini in 1977. Since then, Antonini Navi has been a family-held leader in superyacht custom build and refitting.Credits: Antonini Navi
December 20, 2024
Turkish shipyard Sarp Yachts has released the first interior renderings of the XSR 85 RPH, a 25.9-metre raised-pilothouse model set to debut in late 2025. Developed in collaboration with Red Yacht Design and Van Oossanen Naval Architects, the yacht is described as having “more expansive interior and exterior spaces” compared to previous models in the XSR series.According to the shipyard, the interior design takes cues from “the captivating beauty of ocean life,” using light tones and airy spaces to promote a connection to the seascape. The yacht accommodates five cabins, including a main deck master cabin with a private bow terrace. Al fresco dining options are available on the sundeck, and lounge areas are located on the main deck aft and swim platform.Design director of Red Yacht Design, Cana Gokhan, stated: “The XSR 85 RPH represents our commitment to pushing boundaries in yacht design. By integrating an ocean-inspired theme with modern luxury and optimising both interior and exterior spaces, we’ve created a yacht that sets a new benchmark in its category."Elkin Yildirim, general manager of Sarp Yachts, added: “The XSR 85 RPH represents a leap forward in yacht design and functionality. In this project, we push boundaries and craft a vessel that merges elegance, comfort and practicality. We are thrilled to share these remarkable interiors, which perfectly reflect our dedication to innovation and excellence."Credit: Sarp Yachts
December 19, 2024
The 2025 RORC Transatlantic Race’s multihull lineup presents a departure from recent years, as a range of different vessels seek Line Honours in the MOCRA Class. Previous editions were dominated by MOD70s, but this year’s field promises greater diversity.Among the competitors is Oren Nataf’s Pulsar 50 Rayon Vert (FRA). In 2021, Rayon Vert secured overall line honours in the RORC Transatlantic Race, finishing in 9 days 2 hours 33 minutes and 19 seconds, and later took second place in MOCRA for the 2021 Rolex Fastnet Race. For the 2025 edition, Rayon Vert will race double-handed with François Seruzier.Miami-based Jacopo Bracco enters with the custom 53-foot trimaran Finn (USA), designed by Renaud Banuls. Bracco has raced multihulls since childhood, and Finn’s crew includes individuals with MOD70 experience, such as project manager Sam Mabey, 5.80 Transat winner Etienne Messikommer, and record-setter Jeff Mearing. Bracco stated: “In the right conditions, Finn can easily hit 20 knots and surf at 30!” He also noted one concession: “I have found a real Italian restaurant in Lanzarote which will be preparing some great meals. I am originally Italian, so there is no way we are going to race without good food!”Clarin Mustad’s Alibi 54 trimaran Dakota returns after failing to start in 2024 due to rudder issues. Now prepared in Lanzarote, Dakota could finish in about 12 days under ideal conditions. Mustad, new to ocean racing, said: “I prefer to compete rather than cruise because it makes the journey so much more exciting.” Dakota, bearing a Grenadian sail number, will be crewed by experienced sailors including co-skipper Carles Boned Roig and Christina Menabó, plus other friends.Thierry Roger’s Newick 39 trimaran Perros-Guirec, a sistership to the 1978 Route du Rhum winner Olympus Photos, will also compete. Roger will race double-handed with longtime colleague Renan Le Penven and aims to maintain an average speed of 10 knots. Roger, who has waited years to attempt a transatlantic crossing, said: “This will be my first transatlantic, but I have looked out over that ocean all my life… Now, at 64, I work less, so I have raced the boat in many regattas, but my ultimate goal is the 2026 Route du Rhum.”These entries join others in the Multihull Class at the RORC Transatlantic Race, supported by Calero Marinas, the International Maxi Association, and the Yacht Club de France. The race is scheduled to start on January 12, 2025, from Marina Lanzarote, covering 3,000 miles to Camper & Nicholsons Port Louis Marina in Grenada.Credit: RORС
December 19, 2024