Floating Supercar that’s built for Monaco | Koshi 51GT

The Koshi 51 GranTurismo sits in a very specific segment of the performance boating market, where lightweight construction and high-speed capability are prioritised over traditional cruising comfort or long-range liveaboard design. This is a 16.2-metre platform built entirely from a carbon fibre monocoque structure, with the focus clearly on reducing displacement and maximising performance efficiency. At approximately 2,100 kg excluding engines & accessories, the hull weight is significantly lower than most boats in this size category. Power comes from four Mercury 500R outboards, delivering a combined 2,000 horsepower. On paper, this places the boat in the high-performance offshore category rather than conventional day boating. The design brief is not centred around extended onboard living or heavy systems integration. Instead, it focuses on speed, responsiveness, and reduced resistance through the water. This boat is for someone who already lives in the top tier of yachting and speed culture and is looking for a high-speed extension of that lifestyle, not a traditional boat. Thanks, Dan, THANKS TO OUR SPONSORS Mention Code DBL for discounts on Marine Mold Construction https://ms-marine.eu/ BOAT BUILDERS https://dansboatlife.com/boat-builders BOAT BUYERS https://dansboatlife.com/boat-buyers BOAT OWNERS https://dansboatlife.com/courses Watch Part2: https://youtu.be/nUCgufOEERg 00:00 Start 01:40 Safety features and variable deadrise hull design explanation 04:30 Quad Mercury 500 race engines and exterior carbon fiber details 07:30 GT cockpit layout with wraparound seating and sun lounge 09:30 Aerodynamic shade system and wind deflection design 10:51 Entertainment area with carbon barbecue table and storage 13:00 Guest comfort features and wind protection testing 15:30 Helm station with carbon controls and display systems 18:30 Forward bow seating area with retractable table 23:00 Interior cabin tour with accommodation and carbon fiber hinge system