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.”
Ocean Independence has announced two major developments, highlighting its expanding presence and strategic collaborations in the global yachting industry.The company has opened a new office in Dubai, marking its 16th location worldwide. Situated at the Dubai Harbour Marina, the office strengthens Ocean Independence’s presence in the Arabian region, a rapidly growing hub for superyachting. The new branch will be led by experienced broker Sebastian Dumitrescu, who has been appointed Group Director. CEO Peter Hürzeler emphasized the importance of a local presence in key markets, noting that Dubai offers significant opportunities across sales, charter, and yacht management services. G24 ClassicIn addition, Ocean Independence has formed a strategic partnership with the Giangrasso Group, an emerging player in the Italian yacht market. The Giangrasso Group, known for its longstanding expertise as a subcontractor for major shipyards, is now launching its own brand. Ocean Independence is serving as the global sales agent for the company’s new semi-custom and full-custom superyacht lines.Sebastian Dumitrescu and Peter Hürzeler The partnership’s first project is the G24 Classic, a 24-meter yacht crafted entirely of aluminum and designed by Arrabito Naval Architects. The vessel, with a top speed of 27 knots and a cruising range of 300 nautical miles, features interiors by designer Michela Reverberi. The yacht is tailored as a family-friendly world cruiser with elegant, maritime-inspired interiors. The G24 Classic is set to make its global debut at the Cannes Yachting Festival after delivery to its owner in August.G24 ClassicOcean Independence is also supporting the Giangrasso Group’s plans to expand its portfolio with two additional semi-custom platforms, measuring 34 and 45 meters. Hürzeler expressed optimism about the collaboration, citing strong market interest in the size range.With these developments, Ocean Independence continues to expand its footprint and reinforce its role as a key player in the global yachting industry.Credits: Ocean Independence
January 23, 2025
Saxdor Yachts used its press conference at boot Düsseldorf 2025 to showcase developments in its business, technological advancements, and product range. The Finnish company reported significant milestones, introduced digital tools for customer engagement, and unveiled updates to its lineup.Saxdor 460In 2024, Saxdor Yachts achieved a record-breaking year, surpassing €100 million in revenue. Within five years of its founding, the company has grown to produce over 500 boats annually, expanded its dealership network to 152 global locations, and entered eight new markets. The workforce now exceeds 600 employees.During press conference At the event, Saxdor launched Saxdor AI and a Virtual Showroom in collaboration with Younite and Cadentia Technologies. Saxdor AI is designed to provide personalized, interactive assistance throughout the customer journey, from exploring models to post-purchase support. The Virtual Showroom enables customers and dealers to experience the fleet in a photorealistic, customizable digital environment, offering detailed views and configuration options.During press conference The company also unveiled the Fathom® e-Power system, an advanced lithium-ion auxiliary power management solution developed in partnership with Navico Group. Available on the Saxdor 400 GTC and the forthcoming 460 model, the system offers a quiet and efficient alternative to traditional diesel generators, supporting high-demand systems such as air conditioning and stabilization.Saxdor 460Saxdor announced the global debut of its new flagship model, the Saxdor 460, set for the Cannes Yachting Festival in 2025. The model is aimed at customers seeking increased space and versatility, marking the company’s entry into a larger market segment.Saxdor 460Since its inception in 2019, Saxdor Yachts has experienced exponential growth, producing over 1000 boats and capturing the industry’s attention with their innovative approach. Now, with the introduction of the Saxdor 400 GTO, Saxdor Yachts aims to make waves in the 40-45 ft sport boat market, leveling up from the game-changing entry-level 200 and mid-range 320 models.Credits: Saxdor Yachts
January 23, 2025
Columbus Yachts has announced the launch of M/Y Acqua Chiara, the first unit of its Atlantique 47-meter series. The ceremony took place at the shipyard, marking the introduction of a vessel designed for enhanced onboard living and seamless connection with the sea.The yacht features a steel hull, an aluminum superstructure, and a beam of 9.10 meters. It is built with a gross tonnage of 499 GT and a draft of 2.4 meters. Exterior and interior designs were created by Hot Lab studio, while Columbus Yachts handled the naval architecture. The design emphasizes fluid lines, particularly at the stern, which is arranged over three levels: a covered dining area, a living area with a pool and opening balconies, and a platform close to water level.The main deck features a second pool at the bow, surrounded by a sunbathing area, circular seating, and tables. The interior incorporates materials such as leather, marble, glass, and mosaic, provided by Sicis. Accommodations include a forward master cabin on the main deck, two king-size cabins, and two twin cabins on the lower deck, each with en-suite marble and mosaic bathrooms. Crew accommodations include eight berths across four cabins, with the captain’s cabin adjacent to the wheelhouse.The yacht’s garage is equipped to store a five-meter tender, a rescue tender, and two jet skis. Powered by twin 1350-horsepower engines, M/Y Acqua Chiara achieves a top speed of 15.5 knots and a cruising speed of 14.5 knots, with a range of 3,400 nautical miles at 12 knots.The Atlantique 47M marks another milestone for Columbus Yachts.Columbus Yachts was established in 2008. In early 2019, the shipyard launched the new flagship Columbus Classic 80m M/Y Dragon, which joins in the Columbus star-studded fleet with the award-winning Sport Hybrid 40 Divine, the 57m M/Y Taiba and the 40m M/Y Eleonora III. The Columbus range offers four different lines: Sport, Classic, Crossover and Custom for unique projects. Currently, Palumbo Superyachts comprises a representative office in Monaco and a logistics network of five shipyards in the Mediterranean (Ancona, Malta, Marseille, Naples and Savona), operating under just as many world-renowned brand names: ISA Yachts, Columbus Yachts, Mondomarine, Extra Yachts and Palumbo SY Refit.Credits: Columbus Yachts
January 23, 2025
The Italian Sea Group has announced the launch of the Admiral 78m mega yacht, the latest flagship in its Admiral fleet. The launch ceremony took place at the company’s headquarters in Marina di Carrara and was attended by the owner team, local authorities, political figures, and the shipyard’s personnel.The Admiral 78m features exterior and interior design by Sinot Yacht Architecture & Design, with naval architecture managed by The Italian Sea Group. Its construction incorporates a steel hull and an aluminum superstructure, combined with a diesel-electric propulsion system. Variable speed generators, Azipods for improved maneuverability and reduced vibrations, and a lithium polymer battery pack enhance its performance and sustainability. This configuration allows for silent, zero-emission anchoring and efficient energy use.The yacht is designed to accommodate 12 guests and includes features such as a six-meter swimming pool, a spa, a dive area, a gym, and a Touch & Go helicopter platform. The combination of advanced technology and sustainable solutions reflects The Italian Sea Group’s emphasis on ecological innovation in luxury yachting.The Admiral 78m is positioned as a significant advancement in the sector, with the shipyard highlighting its focus on reduced environmental impact and energy efficiency alongside traditional luxury. This vessel marks another step toward sustainable practices in the yachting industry while maintaining a focus on design and functionality.The Italian Sea Group is a global operator in the luxury yachting industry, listed on Euronext Milan (“EXM”) and active in the construction and refit of motor yachts and sailing yachts up to 140 meters. The Company, led by Italian entrepreneur Giovanni Costantino, operates on the market with the brands Admiral, renown for elegant and prestigious yachts, Tecnomar, Perini Navi, and Picchiotti; the Company has a business unit, NCA Refit, that manages the maintenance and refit services for yachts and mega yachts with a length over 60 meters. Credit: TISG
January 22, 2025
Sanlorenzo, in collaboration with MAN, has announced the development of a yacht equipped with a bi-fuel green methanol propulsion system, designed to reduce navigation emissions by up to 70%. The project, unveiled at the Blue Innovation Dock at Boot Düsseldorf, will debut on Sanlorenzo’s 50 X-Space model, planned for launch in 2027.The bi-fuel propulsion system forms part of the LIFE MYSTIC project, co-financed by the European Union under the LIFE program. The initiative, which began in June 2024 and spans 54 months, represents a €4.8 million investment, 60% of which is funded by EU grants. The project involves the installation of MAN diesel engines and Nanni Industries generators adapted to run on a combination of green methanol and diesel. Expected outcomes include significant reductions in greenhouse gas emissions, fossil fuel consumption, and air pollutants.Methanol was selected for its potential as an alternative maritime fuel. It is liquid at ambient temperature, biodegradable, and compatible with existing infrastructure with minimal modifications. When derived from renewable sources, green methanol achieves net-zero emissions. This fuel is already available in over 100 ports worldwide, with its use growing in Northern Europe, where green corridors support methanol-fueled vessels.Sanlorenzo’s strategy anticipates global and European regulatory targets for emission reductions. The 50 X-Space model aims to surpass the International Maritime Organization’s 2040 target of a 70% emission reduction and the EU’s 2030 Fit for 55 agenda goal of 55%.The project aligns with Sanlorenzo’s broader "Road to 2030" strategy, focusing on sustainability and innovation. In 2024, the company introduced the 50Steel, the first yacht with a green methanol fuel cell system for onboard energy, and the BGH-HSV, a hydrogen-powered chase boat capable of achieving zero emissions.Through initiatives like LIFE MYSTIC, Sanlorenzo is contributing to the development of alternative fuel technologies and infrastructure. Sanlorenzo was founded in 1958 in Viareggio by yacht builder Gionvanni Jannetti. In 2005, Massimo Perrotti became the majority shareholder in the shipyard. Sanlorenzo builds yachts ranging from 28.60 to 73 meters in length. Credits: Sanlorenzo
January 22, 2025