FC Cube 125 launches in Lorient as world's largest composite multihull

FC Cube 125 landed in Lorient as a milestone for serious multihull design, not just another large yacht launch. The 38-metre sailing cat is being positioned as the world’s largest high-tech composite cruising multihull, and that matters because the project is built around a tough brief: make a big catamaran fast, structurally advanced, and practical enough for real long-range sailing.

The numbers show how far the build has pushed beyond the usual 50- to 60-foot cruising market. Early technical details called for an 80-ton target displacement, with 37 tonnes of carbon composite, two curved daggerboards, flybridge-controlled manoeuvres, an owner’s suite, four guest cabins and two crew cabins. The boat was also specified with 140 square metres of solar panels and the use of decommissioned aeronautical prepreg carbon, a mix that points to efficiency as much as luxury. The project carried a budget of about €20 million and was built in a new shed at Keroman measuring roughly 1,500 to 1,647 square metres.

Design pedigree is central to why FC Cube 125 stands apart. The yacht was drawn by the Finot-Conq Group, with structural engineering by GSea Design and hull optimisation by Antoine Koch, for a French owner. The profile is strikingly aggressive for a cruising cat, with fine bows and a low deckhouse that make it look closer to an offshore racer than a conventional passagemaker. That visual language is no accident. It reflects a brief that called for regular, comfortable sailing above 30 knots, a target that puts the boat in a different conversation from most large cruising multihulls.

The project itself was launched by FC Cube in 2023, founded by veteran offshore racer and boatbuilder Ollivier Bordeau and sailor Philippe Delamare. Delamare’s racing background and the company’s focus on a performance-first cruising platform give the boat a pedigree that runs well beyond styling. Finot-Conq’s own offshore-racing record adds to that weight, with its Imoca designs winning four Vendée Globe editions between 1992 and 2004.

As sea trials and sailing trials move ahead, FC Cube 125 will quickly show whether its composite structure, large sail plan and heavily optimised hulls can deliver on the promise baked into the design. For the multihull world, the launch is a clear sign that top-end sailing cats are still a place for ambition, experimentation and serious speed.