HYDROFOIL SHIP Russian patent published in 1996 - IPC

FIELD: shipbuilding. SUBSTANCE: ship has unsymmetrical profiling of side struts of aft hydrofoil located above cruising speed waterline; angle of transverse V-form of side struts is selected between 45 and 80 deg together with positive strut angle relative to ship's CL. Part of side struts of unsymmetrical profile have positive geometric twist. Curvature of center line of unsymmetrical profile of side struts increases in height towards ship's hull. Lower part of side struts adjoining the hydrofoil plane is made with increased chord projecting beyond the trailing edge of wing. Profile on suction surface in section from leading edge of strut to trailing edge of aft wing plane has lesser curvature as compared with minimum curvature of struts proper. Bottom struts having unsymmetrical profile are located above waterline and their bottom portions located below this waterline have symmetrical profile at different angles of inclination to CL. Second version is characterized by the following: in addition to standard (symmetrical) side struts of aft hydrofoil, ship is provided with bottom struts having unsymmetrical sections above cruising speed waterline and symmetrical sections below this waterline at different angles of lower symmetrical portion and upper unsymmetrical portion of bottom struts relative to ship's CL. EFFECT: enhanced reliability. 7 cl, 9 dwg