Arrow460 Granturismo, the new Mercedes-Benz Style 14m motoryacht developed in partnership with UK boatbuilder Silver Arrows Marine, has embarked on extensive sea trials out of Nice ahead of the final commissioning of the interior, due this month when full technical and commercial details will be released.

Very little has been disclosed about this yacht, however naval architecture firm Van Oossanen has revealed details of its contribution to optimise the performance of the hull.

The objective was not simply to build the fastest 14m motoryacht, but one that combines all-round performance with great comfort and ease of handling. There was also a requirement for the boat to stay ‘dry’ at its 26 knots cruising speed in a variety of different sea states.

Van Oossanen’s contribution to the design process of the Arrow 460 started with applying validated hydrodynamic analyses on the hull design.

As the concept focuses on the optimal comfort experience onboard, the big architectural challenge was to integrate the underwater ‘lines’ with Mercedes Benz above-water designer’s lines.

“Keeping these lines well preserved in the functional design, that at the same time had to deliver excellent performance and the ultimate comfort experience, only was possible by doing extensive computational fluid dynamics (CFD) research on every detail and maintaining a close communication with Mercedes Benz’s designer’s team,” the Dutch firm explains.

Commenting on the project, Van Oossanen’s managing director Niels Moerke says: “Our philosophy was to focus on details, as details make the difference. Examples are the integration of the intermediate spray rails, optimised with help of CFD, and a specific propeller tunnel that is exceptional for yachts with 35+knots speed. ‘Realising details like these in close company with the yard and Mercedes-Benz Style has made all the difference to the unique high quality design of the Arrow460,” he concludes.

UK boatbuilder Silver Arrows Marine has recently announced that it has chosen a pair of the 5.8 litre units Yanmar 6LY3-ETP engines, each developing 480hp to power the vessel. These units give the pre-production craft a maximum speed of around 40kt and 26kt for cruising.

Yanmar is a technical partner in the project. Decision SA, part of the Swiss Group Carboman, constructed the prototype yacht.