Best Naval Architecture: Displacement Motor Yachts, Boat International Design & Innovation Awards 2019

Of nine fully documented entries, three yachts excelled: GO, Stella di Mare and White Rabbit. It is difficult to imagine a more diverse group. Our naval architecture subcommittee ranks entries on a complex matrix including 3D hull lines, computation of horsepower, speed and displacement, CFD or model test information, hull photos and videos of the vessel running. For an owner wanting lots of accommodation and deck space, speed without noise and vibration, spacious entertainment areas, maximum stability and safety, One2three Naval Architects seized on the trimaran form. While 90 per cent of the displacement is in the centre hull, the side hulls house generators that power quiet electric drive motors and add stability. But beam constraints imposed by the owner’s home port mean they are not as far outboard as would be optimal. The bold solution pairs trim tabs and four active lateral foils to control water ow between the centre hull and side hulls. These additions result in roll and pitch reductions of 60 per cent at 16 knots cruise speed tested in a three metre seaway and add significant passive damping at zero speed. The resulting vessel takes top marks for economical performance but innovation leading to a multi-pronged approach to maximum stability and seakeeping earns White Rabbit the prize.

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