Abstract: A foil stabilized monohull vessel which functions as a multiple hull vessel at rest or at low speeds is described. The vessel comprises a main center hull which supports a deck thereover, and a stabilizing structure disposed on either side of the deck. The stabilizing structure includes floats which are intended to rest on the water when the vessel is at rest or at low speeds, and intended to be removed from the water when the vessel is at high speeds. The stabilizing structure also includes one or more pairs of opposed foils which act as stabilizers disposed on the port and starboard sides of the vessel. The stabilizer foils act in concert to reduce roll and improve maneuverability.

Abstract: A boat is disclosed which is particularly adapted for operation in rough seas. It includes a closed support hull, open support structure extending upwardly from the support hull, a deck mounted above the support hull and on the open support structure, a closed stabilizer hull laterally spaced from the support hull, and open connecting structure between the stabilizer hull and the support hull thereby permitting tall waves to pass over the hulls and through the support structures to provide a vessel for transporting motor vehicles, passengers and the like through open, rough seas.