ACTIVE HYDROFOIL Russian patent published in 2007 - IPC B63B1/24 

FIELD: shipbuilding; manufacture of hydrofoils for hovercraft.

SUBSTANCE: proposed active hydrofoil has streamlined body with continuous driving surface and convex suction surface and system of slotted nozzles which are hydraulically connected with hydrofoil interior. Hydrofoil interior is connected with hydraulic supercharger by means of passages in struts. Used as liquid supercharger is transonic jet apparatus-mixer-pump; liquid fed to hydrofoil interior is two-phase mixture of water generated in apparatus with gas (vapor or air); content of gas ranges from 20 to 90%. Extreme (aft) inter-slot body is made in form of solid or split hydrofoil whose upper surface is part of suction surface of active hydrofoil. Lower surface having artificial roughness along trailing edge is provided with plate-type interceptor.

EFFECT: improved hydro-dynamic properties of hydrofoil.

2 dwg