solarimpact Yacht unveiled a 78-foot (23.9-meter) design with a virtual 3-D model at the Cannes Yachting Festival in september. the aluminum-hulled yacht is based on the small waterplane area twin Hull (swatH) construction principal. solar is the primary energy source for quiet efficiency. she purports to offer a top speed of 20 knots. Controlled by artificial intelligence, systems are automated so the yacht can be maneuvered single-handed. the solarimpact is designed by marlena Ratajska and is being built by schaff Yachtbau in germany.