WATER CRAFT PROPELLER Russian patent published in 1999 - IPC

FIELD: shipbuilding; water craft propellers. SUBSTANCE: water craft propeller has through passage made in form of slit and located near hull of water craft at least one plate rotor and drive of rotor. No less than-half of rotor is sunken in cavity of one wall of passage; surface swept by rotor and opposite wall of through passage have clearance. Area of inlet hole of through passage exceeds area of outlet hole of passage by 1.2 times. Cut-outs are provided in root section of rotor plates; width of these cut-outs from axis of rotor does not exceed 0.85 of radius of surface swept by rotor. EFFECT: reduction of energy consumption in creating thrust by propeller. 2 cl, 4 dwg