EXTENSIBLE ROTARY PROPULSIVE SCREW-RUDDER Russian patent published in 2006 - IPC B63H25/46 B63H11/10 

FIELD: shipbuilding; active control of ships.

SUBSTANCE: proposed rotary propulsive screw-rudder is made in form of water-jet propeller and is provided with streamlined symmetrical vertical nozzle which has water duct made in form of rectangular vertical slit over entire span in center of nozzle. Working member mounted in water duct consists of two vertical rotors for rotation at reversal; working member is mounted in symmetrical cylindrical recesses over entire span of nozzle. Vertical flap mounted at water duct outlet has symmetrical convex profile for turn relative to vertical axis lying in plane of symmetry of nozzle. Vertical flap is mounted at equal clearances between trailing edges of water duct and external convex surfaces of flap profile when it is placed in plane of symmetry of nozzle. Each clearance ensures limitation of flap putting-over.

EFFECT: enhanced handling of ship due to considerable lateral force on flap owing to Coanda effect.

3 dwg