ICEBREAKER PROPELLER SCREW BLADE Russian patent published in 2015 - IPC B63H1/08 B63H1/18 

FIELD: process engineering.

SUBSTANCE: invention relates to ship building, particularly, to icebreaker screw propeller blades incorporated with rudder propellers. Icebreaker propeller screw blade features smooth curvilinear surface and bulge in the area of leading edge. Said bulge is located within 0.35-0.85 of propeller screw radius. Blade profile depth at 0.025 of profile chord length from said leading edge makes 0.25-0.47 of the profile maximum depth. At said distance from leading edge, profile relative depth increases as spacing from propeller screw rotational axis increases. Blade profile depth at 0.05 of profile chord length from said leading edge makes 0.3-0.75 of the profile maximum depth. Blade profile depth at 0.75 of profile chord length from said leading edge makes 0.6-0.7 of the profile maximum depth.

EFFECT: higher efficiency in ice conditions.

2 dwg