Combined cutter and bypass for propeller

Details Combined cutter and bypass for propeller Combined cutter and bypass for propeller

1985-09-12

1987-06-30

Blix, Trygve M.

Marine propulsion

Screw propeller

Self-clearing

440 89, 416 93A, 416146B, B63H 128

Patent

active

046767584

ABSTRACT:
A motor-driven marine propeller is disclosed for propelling a marine vessel. The propeller includes a hub member driven by the motor and a can member disposed coaxially relative to the hub member the can member having a fore and an aft end. The hub member and the can member define therebetween an annular port for the passage therethrough of a portion of the exhaust generated by the motor. Supports extend between the hub member and the can member for supporting the can member coaxially relative to the hub member and a plurality of blades are secured to and extend from the can member with each of the blades being equidistantly spaced relative to each other. Each of the blades defines a leading and a trailing surface such that the propeller rotates in a direction from the trailing towards the leading surface in normal forward motion. A plurality of notches are defined by the fore end of the can member and each of the notches is disposed adjacent to a trailing surface of an adjacent blade such that the notches cut through filamentary material entangled around the propeller and reduce the generation of eddies during rotation of the propeller.

REFERENCES:
patent: 1813540 (1931-07-01), Laska
patent: 3467051 (1969-09-01), Shimanckas
patent: 4276036 (1981-06-01), Nishida et al.
patent: 4331429 (1982-05-01), Koepsel et al.

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