Propeller combination for a boat propeller unit

Details Propeller combination for a boat propeller unit Propeller combination for a boat propeller unit

1990-05-02

1992-07-28

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Plural impellers having relative movement or independent...

Coaxial rotation

416175, 416242, B63H 118

Patent

active

RE0340111

ABSTRACT:
The invention relates to a boat propeller unit with double, counter-rotating propellers. The forward propeller is designed to function without cavitation, while the after-propeller is optimally cavitating by being made cupped and with a blade width of between 60% and 75% of the blade width of the forward propeller.

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"Systematic Studies of Contra-Rotating Propellers for Merchant Ships," Eric Bjarne, Proceedings: International Marine and Shipping Conference organized by the Institute of Marine Engineers and held in London, Jun. 4-8, 1973.

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