WATER-JET PROPELLER ROTOR Russian patent published in 1995 - IPC

FIELD: shipbuilding. SUBSTANCE: rotor consists of hub 1 and set of blades 2. Each blade is located over helical line on surface of hub from front face to rear face in the direction of rotation. Center line of blade foot at sections near front and rear faces of hub is shifted from helical line towards rear face of hub. Thickness of blade reduces with reduction over radius from axis of hub with increase in the direction from leading edge 3 to center portion of blade and with reduction from center portion to trailing edge 4. Outer edge 5 is twisted relative to inner edge 6 at inclination of leading edge towards side opposite to rotation and inclination of trailing edge towards side of rotation. Leading and trailing edges have convex-concave form with convexity of leading edge towards rear face and convexity of trailing edge towards front face. Device reduces speed of reaction jet for enhancing the propeller efficiency. EFFECT: enhanced efficiency of propeller. 5 dwg