Romaric Neyhousser

Lalou Roucayrol, multihull architect and long-time collaborator of Guillaume Verdier

Romaric Neyhousser is an independent naval architect based in Gujan-Mestras (Gironde). Trained in fluid mechanics and then in materials and structures mechanics, he works at the intersection of offshore multihull racing and the Guillaume Verdier design team, of which he is one of the first collaborators.

From Yves Parlier of Vaucluse to the Aquitaine Design Team

For nearly ten years, he worked with Yves Parlier — first on the preparation of the Open 60Aquitaine Innovations, then on the design of the stepped catamaranHydraplaneur Médiatis Région Aquitaine (2002), within the Aquitaine Design Team he formed with Guillaume Verdier, Loïc Goepfert and Grégoire Durousseau.

The Multi50 and Ocean Fifty multihulls of the Lalou Roucayrol team

His multihull signature is his continuous collaboration with Lalou Roucayrol and his yard in Verdon-sur-Mer (Lalou Multi, renamed Neo Sailing Technologies in 2023). He successively designed several 50-foot trimarans built on site:

• Multi50 Arkema Région Aquitaine (March 2013) — Neyhousser, Verdier and Benjamin Muyl designs, Lalou Multi.
• Mini 6.50 Arkema 3 "Innovation" (2016) — the world’s first sailboat built in recyclable thermoplastic composite, using Arkema’s Elium resin infused with carbon.
• Multi50 Arkema 4 (September 2020) — a powerful, versatile inshore and offshore boat.
• Ocean Fifty Edenred 5 (launched 18 July 2025 at Verdon-sur-Mer) — an evolved sistership of Arkema 4 and Primonial, skippered by Basile Bourgnon and Emmanuel Le Roch. Eleventh and final Ocean Fifty of the class, built at Neo Sailing Technologies.

Long-time collaborator of Guillaume Verdier

On the monohull side, Romaric Neyhousser has been involved sinceSafran — the boat that launched the Verdier office — and on subsequent IMOCA and Ultime designs:Apivia (Charlie Dalin), LinkedOut (Thomas Ruyant), the Maxi Edmond de Rothschild / Gitana 17. More recently, he supported Erwan Tymen and Hervé Penfornis on the MACIF Santé Prévoyance project, winner of the 2024–2025 Vendée Globe with Charlie Dalin.