Cor D. Rover Design

Born on a Barge, Trained by Frank Mulder, and a Studio Founded in 1997

Rover has told the trade press he originally wanted to design aeroplanes, not boats, but growing up close to the yards around Hardinxveld-Giessendam in the Netherlands, including Damen, pulled him back to the water. He studied mechanical engineering with naval architecture alongside it and graduated in 1986. His own account, given to SuperyachtTimes in his floating office on the Nieuw Maas river in January 2023, is that his early work under Frank Mulder was purely technical, structural calculations rather than styling, and the project that changed that was the Heesen motoryacht Octopussy, a 40.2 metre hull built in 1988 to break the 50 knot barrier for the American owner John Staluppi. SuperyachtTimes and itBoat's company profile both independently credit him, working under Mulder, with the construction calculations on Octopussy and the later Moonraker; Octopussy went on to reach just over 53 knots, the fastest megayacht in the world at the time.

Boats.com's profile and the SuperyachtTimes long read both put the founding of his own studio at 1997, and the arithmetic in the SuperyachtTimes interview, graduated 1986 plus eleven years under Mulder, lands on the same year independently. The Dutch trade title Jachtbouw Nederland reports that two years later, in 1999, Rover won two commissions at the Monaco Yacht Show: a 40 metre yacht and the conversion of a 120 metre icebreaker, a figure this research could not independently confirm from a second source. As of a SuperyachtTimes studio visit in January 2023 the practice worked out of a 1930s former police building on Rotterdam's Nieuw Maas river with a team of seven, including Rover's own daughter; current SuperyachtTimes and itBoat listings now give the address as Singel 112A in Amsterdam, so the studio has since moved, though this research found no published announcement of when or why.

The Custom Fleet: Hakvoort, Mondomarine and a First Benetti

Blue Belle, delivered by the Italian yard Mondomarine in 2003, paired Rover's exterior with naval architecture by Sydac and an interior by Isabelle Blanchere; Superyachts.com and Boat International's yacht directory both confirm the 40.45 metre length. Five years later Hakvoort in Monnickendam delivered the 45 metre My Trust, Rover's first commission for that yard and, according to Fraser Yachts, the fourth largest hull Hakvoort had built at that point. Her naval architecture came from Diana Yacht Design and her interior from Felix Buytendijk; she was later resold and renamed Awatea, and Superyachts.com, Boat International and YachtCharterFleet all identify Awatea and My Trust as the same 2008 hull rather than two boats.

Mondomarine returned for the 50.8 metre Mrs L in 2009, confirmed at that length by both itBoat's portfolio table and SuperyachtTimes' company page, cementing what itBoat's own company history calls a long-running relationship between the studio and the yard. Then in 2017 Benetti launched Seasense, its first collaboration with Rover, opening the relationship that has since become the largest single yard in his flagship-scale portfolio.

Let's build a boat around the pool, the client told Cor D. Rover after hearing about his patented ballast-and-pool system, and the result, Royal Huisman's 58.5 metre Phi, became the longest motoryacht in the world built under 500 gross tons. She has also been sitting under legal detention in London since March 2022, a record no brokerage listing will show you.

Seasense: Benetti's First Rover Yacht, and an Owner Who Made Them Redo It

Cohen told Boat International that his first set of interior concepts, from an LA-based studio, were rejected outright: We hated it, we threw it back at them and made them do it better. He described the finished yacht, which the family use roughly 90 per cent of the time when aboard, in the same interview: I'm still stunned, there are things I hadn't seen that I now see. Benetti's own site credits the exterior design and concept to Cor D. Rover and the interior to its in-house Interior Style Department, while naval architecture on Seasense was handled by Benetti's technical office rather than an outside firm, according to Robb Report's coverage of the design.

The yacht won World Yachts Trophies' 2018 Best Exterior Design award in the 54 to 82 metre class and was a finalist in Boat International's 2018 Design and Innovation Awards for Best Exterior Styling. Her most distinctive feature, the tall, narrow slot windows down her topsides and the aft Beach Club with its coverable pool doubling as a basketball court, are the same vocabulary Rover has carried into later custom work; at delivery Seasense was, by his own account to SuperyachtTimes, the largest yacht he had designed to date.

Phi: The World's Longest Sub-500 Gross Ton Motoryacht

By Rover's own account to SuperyachtTimes, the project began around 2018 when a client asked for something unusual and technology-driven; Rover had recently patented what he calls a dump tank eliminating pool floor, an inflatable rubber seal that lets a yacht's swimming pool double as ballast without draining it underway, patented in 2012. The client's response, in Rover's telling, was direct: Let's build a boat around the pool. The rest of the concept came together later that year, when Rover and Perry van Oossanen, founder of Van Oossanen Naval Architects, sketched out the idea of the world's longest sub-500 gross ton motoryacht during a boat show in Beijing, using van Oossanen's Fast Displacement Hull Form to make the narrow, sailing-yacht-like hull work under power.

Royal Huisman, a yard better known for sailing yachts, built her; Rover has said plainly why he went there rather than negotiate on price elsewhere: You don't go to Royal Huisman to make the best deal in terms of costs, you go to Royal Huisman to build the best. The London studio Lawson Robb did the interior around the golden ratio theme that gives the yacht her name, and Guy Booth, the owner's representative on the project, told SuperyachtNews that finding a yard willing to build something this unconventional was not straightforward: The conservative nature of this industry really doesn't help. Phi was handed over at the end of 2021 as, at the time, the largest motoryacht Royal Huisman had ever delivered.

A Flagship That Has Never Left London

Phi had only just been delivered and was in London for the World Superyacht Awards when the then Transport Secretary Grant Shapps ordered her detention, the first use of the UK's post-invasion Russia sanctions regime against a superyacht, as reported at the time by NPR and multiple UK outlets. Naumenko, identified in later reporting by the legal firm Farrer and Co and by Megayacht News as the yacht's ultimate beneficial owner, has said he holds no Russian government position and challenged the detention in court; a judge rejected that challenge in 2023, and the Supreme Court dismissed his final appeal in 2025, per Megayacht News and Farrer and Co's own case note.

None of this reflects on the design itself; the detention followed delivery and had nothing to do with Rover's work or Royal Huisman's build. But it is the single most important thing a reader researching this studio's best-known project needs to know before assuming the record-setting hull is out earning her keep on the golden ratio Rover and his client spent years designing around. It is also, on the evidence available, unresolved: as of this research, Phi remains impounded.

Horizon's "SUVs for the Sea": the FD Series Production Line

Rover has described the pitch itself as a rainy-afternoon sketch: a beamy 24 metre hull with a five-stateroom layout more typical of a much larger yacht, drawn after his team noticed how popular SUVs had become on European roads and wanted a comparable practical, protected feeling on the water. John Lu's reported response, on seeing the drawings, was immediate: Let's build it. Rover has since compared the series directly to Porsche's Cayenne: Volume is king and will always be.

Horizon's own account of the partnership puts an earlier public milestone at 20 new-build FD series yachts sold within three years, and the series has since grown to seven models spanning the FD75 through a proposed FD125. Rover's studio is credited on every one of them, per SuperyachtTimes, a volume of work that a purely custom studio the size of his, seven designers as of the 2023 visit, would not otherwise be able to sustain.

Beyond Horizon: Zeelander, Sirena, Jetten and a Correction Worth Making

The Zeelander Z55, styled with the Zeelander design team around a retro lobster-boat profile given a modern hull and engineering, and Jetten's Beach-45, whose Best Powerboat award from 2017 is documented on multiple builder and press sites, both show the same production-friendly approach Rover brought to Horizon: a strong, repeatable exterior identity rather than a one-off custom brief. Van der Valk's Beach series, including a design that moved the engine room under the aft swimming platform, rounds out a client list that leans heavily on Dutch and Taiwanese semi-custom yards.

One credit is worth correcting rather than assuming: Sirena Yachts, in the SuperyachtTimes interview and on the brokerage site eyachts.com.au, is named as an interior client of Cor D. Rover Design, not an exterior one, the reverse of the credit most other yards carry. Rover has said the expansion into interior work followed losing a number of larger jobs to competitors who could offer a client both exterior and interior design under one roof, prompting him to grow his own team to match. A prospective client or buyer should check which discipline is actually credited on a given hull before assuming the studio's usual exterior role.

No Feadship Credit Found, and a 60-Metre Ice-Class Explorer Ahead

Feadship's own design and engineering arm, De Voogt Naval Architects, generally keeps naval architecture and often exterior styling in-house or works with a small set of named outside studios, and this research, across every company profile, portfolio page and press interview it could locate for Cor D. Rover Design, did not turn up a single Feadship hull among them. His flagship-scale credits run instead through Royal Huisman, Benetti and Hakvoort, with production work at Horizon, Sirena, Zeelander, Jetten and Van der Valk. One further caution: an 80 metre exterior called MERtropolis, shown as one of twelve concept exteriors in Oceanco's Simply Custom catalogue, carries Rover's name but is a paper design offered to prospective clients, not a yacht under construction, and should not be read as a delivered Oceanco credit.

Rover told SuperyachtTimes in January 2023 that Seasense, at 1,175 gross tons, would soon be superseded as his largest design by an Ice Class explorer of 1,700 gross tons, then still confidential. That yacht is almost certainly Horizon II, launched by Leapher Shipbuilding in the Netherlands in 2026 at 60.96 metres and exactly 1,700 gross tons, the exact 525 gross ton gap Rover described. She is a polar-classed steel explorer offering 40 days of autonomy at sea, built with naval architecture from Van Oossanen Naval Architects and O7 Designers, and is the largest yacht Leapher has built to date, a clear step for Rover away from Horizon's semi-custom hulls and toward the kind of long-range, ice-capable expedition work several established explorer-yacht specialists have moved into over the past decade.

Para quién es: A buyer or owner drawn to a studio that can do both ends of the market, a repeatable semi-custom exterior on a Horizon, Zeelander or Sirena hull, or a genuinely record-setting custom flagship like Phi or Seasense, and who wants the design pedigree checked hull by hull rather than assumed from brokerage copy, especially the common but unconfirmed Feadship association and the unresolved legal status of the studio's most famous yacht.