Boat

Details Boat Boat

1980-12-22

1984-10-23

Basinger, Sherman D.

Ships

Hull or hull adjunct employing fluid dynamic forces to...

Having fluid channeling or entrapping configuration

114 56, 114 61, B63B 120

Patent

active

044781660

ABSTRACT:
A boat which greatly reduces ventilation under a boat and cavitation in an outboard motor's propeller is disclosed. Preferably, a skeg and hulls are arranged to produce a zone behind the boat which is substantially free of froth and in which a propeller may operate efficiently. Preferably, the skeg is trapezoidal in cross-section with substantially planar surfaces. It runs forward from its broad end to its source, which preferably lies in a section about 60-75% of the boat's length forward from the stern. Channels running between the skeg and hulls uniformly decrease in area as they run aftward. Thus, lift of the stern is increased by the increase in the apparent water pressure and velocity in the channels. The skeg's shape acts as a shield for the propeller and helps to direct the water outwardly to develop a zone behind the skeg where the motor can operate more efficiently.

REFERENCES:
patent: D226870 (1973-05-01), Livingston
patent: 3148652 (1964-09-01), Canazzi
patent: 3600733 (1971-08-01), Lippisch
patent: 3937164 (1976-02-01), Austin
patent: 4091761 (1978-05-01), Fehn

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