Double propeller drive for boats

Details Double propeller drive for boats Double propeller drive for boats

1984-02-02

1986-10-28

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Plural impellers having relative movement or independent...

Coaxial rotation

416200R, 416201A, B63H 510

Patent

active

046195840

ABSTRACT:
A boat propeller drive with double, counter-rotating propellers is distinguished by the after propeller having one more blade than the fore propeller as well as a smaller diameter than the fore propeller.

REFERENCES:
patent: 537612 (1895-04-01), Leathers
patent: 599125 (1898-02-01), Fefel
patent: 968823 (1910-08-01), Westinghouse
patent: 1224120 (1917-04-01), Cake
patent: 1717663 (1929-06-01), Checkley
patent: 1853694 (1932-04-01), Melcher
patent: 2672115 (1954-03-01), Conover
patent: 3356150 (1967-12-01), Ruszczycky et al.
patent: 3396800 (1968-08-01), Hillander et al.

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