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.”
MarineMax broker Scott Roberton has facilitated the sale of a new Ocean Alexander 28E explorer yacht to experienced owners transitioning from a Sanlorenzo SL86. The 28-meter vessel was selected for its operational efficiency and spacious layout featuring four staterooms and dedicated crew quarters."The 28E checked every box," stated Roberton. "It delivers true exploring capabilities while maintaining a refined, contemporary aesthetic that rivals any European builder." The owners specifically valued the model's 70-square-meter aft deck and on-deck master suite.Designed by Evan K. Marshall with a focus on volume and functionality, the 28E will operate seasonally between Newport, Rhode Island and Florida/Bahamas waters. The sale represents the owners' first acquisition from Ocean Alexander's Explorer series.Dan Mundy, Ocean Alexander's Head of Global Operations, noted: "The 28E exemplifies the innovation, volume, and versatility that define our Explorer series." The model's 90-ton displacement and 2,000-nautical-mile range address growing owner demand for capable coastal cruisers with superyacht amenities.MarineMax Newport's Frank Brennan assisted in the transaction. The yacht will enter private service following final commissioning. Ocean Alexander currently produces the 28E at its Kaohsiung, Taiwan facility with an estimated 12-month build timeline.Ocean Alexander is a family business. Two generations of one family have guided the shipyard for almost four decades. With manufacturing in Taiwan, Ocean Alexander is consistently one of the top selling brands for large yachts in the U.S. and currently produces models ranging from 26 to 36 meters in length. Credits: Ocean Alexander
June 13, 2025
The Italian Sea Group secured two awards at the 2025 International Yacht & Aviation Awards in Monte Carlo. The 66-meter Admiral JAS won in the "Motoryacht over 60 meters" category, while the 78-meter Admiral Platinum claimed victory in the "Motoryacht over 70 meters" division."We are proud that two of our most recent creations have received such prestigious recognition," said Gianmaria Costantino, CCO of The Italian Sea Group. "This highlights our commitment to excellence and innovation."The Admiral JAS, designed in collaboration with Mark Berryman, represents the semi-custom ADM 66 series with four units sold. Brad Whiteman of Qudra Yachts served as owner's representative during construction. The yacht features integrated indoor-outdoor spaces developed by MB Architects.The flagship Admiral Platinum, a full-custom project, features exterior design by Lobanov Design and interiors by Sinot Yacht Architecture & Design. Magnitude Yachts oversaw construction as owner's representatives.Both yachts were recognized for their construction quality and design execution. The awards ceremony took place June 6 at Hôtel de Paris, Monaco, during the 16th edition of the Design et Al competition.The Italian Sea Group currently operates production facilities in Marina di Carrara, with both awarded yachts delivered within the past 12 months. The company maintains active construction projects across its Admiral and Tecnomar brands.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: The Italian Sea Group
June 13, 2025
Ferretti Group has launched the 100th unit of its Riva Rivamare 38 model during a ceremony in Sarnico attended by Chairman Jiang Kui and representatives of majority shareholder Weichai. The event precedes the unveiling of a special limited series scheduled for June 27.The 11.6-meter Rivamare remains one of Riva's most successful models since its introduction. The milestone launch coincides with Ferretti Group reporting a record order book of €1.7 billion for early 2025."This magnificent day celebrates the huge success for Riva and Ferretti Group as a whole," said Jiang Kui. "We are confident that Ferretti will maintain this sustainable growth and continue to create value for all stakeholders."Ferretti Group CEO Alberto Galassi noted the company's upcoming product launches: "At the end of the month, we will unveil three new Riva models, confirming our drive to strengthen leadership in beauty and innovation." The Rivamare's continued production demonstrates Riva's ability to maintain demand for classic designs while introducing new models.The ceremony recognized the Sarnico shipyard workforce responsible for building all 100 Rivamare units. The model's success contributes to Ferretti Group's portfolio of seven yacht brands, which collectively delivered 49 vessels in 2024.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
June 13, 2025
Northrop & Johnson has announced the launch of Ocean Angel, the second 40-meter explorer yacht in Ocean King's DOGE 400 series. The vessel has commenced sea trials and is scheduled for delivery ahead of its debut at the 2025 Monaco Yacht Show.Designed by aLOT with interiors by Burdissocapponi Yachts & Design, Ocean Angel features a commercial-grade steel hull and aluminum superstructure. The yacht is powered by twin Caterpillar engines that deliver a top speed of 15 knots and a cruising speed of 13 knots, with a transoceanic range of 4,000 nautical miles.Accommodation includes five guest suites for 10 passengers and crew quarters for seven. Notable features include a beach club with sauna and hammam, a concealed 1.2-ton telescopic tender crane capable of launching a 6.25-meter tender, and fold-down sea terraces. The interior design emphasizes natural light through full-height windows and seamless indoor-outdoor connectivity."Ocean Angel demonstrates our commitment to building capable explorer yachts with customized interiors," said an Ocean King representative. The yacht's commercial-grade construction enables extended autonomous operation in remote cruising areas.Following sea trials, the yacht will undergo final outfitting before delivery to its owner. The first DOGE 400 series yacht was delivered earlier this year, with both units sharing the same rugged exploration capabilities paired with refined interior spaces.Credits: Northrop & Johnson
June 11, 2025
The Amels 60 Memories has departed from Damen Yachting’s main build facility in Vlissingen following its final delivery to the new Owner. The yacht was officially named during a private ceremony held at the Dutch shipyard, attended by the Owner’s team and crew.The exterior design of Memories was created by Espen Øino International, featuring the signature geometric windows and enhancements typical of recent Amels deliveries. Notably, Memories is the first Amels 60 to feature custom interiors by Harrison Eidsgaard, marking a new collaboration for the shipyard.The Owner, introduced by Moran Yacht & Ship, joined the project just six months prior to delivery. Despite the late entry, the Owner was able to implement several customizations, including modifications to the Beach Club, Owner’s areas, and Sun Deck, where a large sofa with a ceiling-mounted TV replaced the original dining table and bar. The Bridge Deck Aft was transformed into an on-deck cinema setup from its original lounge configuration.Joppe Osté, Project Manager for Amels 60 Memories, commented: “When the Owner stepped in, we were already at an advanced stage of construction. The advantage of this was that the new Owner was able to make decisions quickly and take possession of it before the start of summer. Until the buyer steps in, we design the yacht for all potential clients. The sales, design, and proposal teams are all involved. That is a major advantage. The custom interiors by Harrison Eidsgaard appealed to her new Owner, which allowed us to stay on schedule and move forward according plan.”The interior design by Harrison Eidsgaard features a contemporary beach house luxury style with natural materials and refined detailing. A notable feature is the spiral staircase with illuminated handrail. Ben Harrison of Harrison Eidsgaard stated: “It has been an absolute delight working on this superyacht and a great collaboration with all partners involved. MEMORIES is our first Amels Limited Editions interior and brings a new look and feel to this successful 60-metre design.”Memories is expected to follow a busy charter schedule, with private use by the Owner also anticipated. The yacht will be available for charter through Moran Yacht & Ship, with its first destination being Ibiza.The next Amels 60 is already under construction and scheduled for delivery in Autumn 2025.The Amels 60 Memories features the following specifications: length of 60 metres, gross tonnage of 853 GT, accommodation for 12 guests and 12 crew plus Captain. The yacht boasts interior design by Harrison Eidsgaard, exterior design by Espen Øino International, and naval architecture by Damen Yachting.Credit: Damen Yachting
June 11, 2025