Counter-rotating boat propeller drive

Details Counter-rotating boat propeller drive Counter-rotating boat propeller drive

1990-03-12

1991-05-21

Swinehart, Ed

Marine propulsion

Screw propeller

Propeller arrangement

440 79, 416129, B63H 510

Patent

active

050171682

ABSTRACT:
A dual boat propeller structure is described for counter-rotation of the propellers. A housing is located outside the boat hull in alignment and connection with an engine shaft. The housing stores a conversion mechanism with which coaxially-mounted propeller shafts are brought into counter-rotation to correspondingly rotate the propellers. A strut interconnects the housing to the boat hull in a manner so as to reduce vibrations from the counter-rotating mechanism. The housing has a frusto-conical shape with which a large diameter aft end is sized commensurate with the hub of the propellers for smooth water flow.

REFERENCES:
patent: 1482381 (1918-07-01), Cake
patent: 2067023 (1936-03-01), Schleicher
patent: 2145623 (1939-01-01), Hill
patent: 2704991 (1955-03-01), Danielson
patent: 2987031 (1961-06-01), Odden
patent: 3167361 (1965-01-01), Snapp et al.
patent: 4050849 (1977-09-01), Sheets
patent: 4304557 (1981-12-01), Henrich
patent: 4604032 (1986-08-01), Brandt et al.
patent: 4710142 (1987-12-01), Lovell
patent: 4792314 (1988-12-01), McCormick

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