High performance boat prop guard with high strength attachment b

Details High performance boat prop guard with high strength attachment b High performance boat prop guard with high strength attachment b

1990-09-21

1992-03-24

Swinehart, Edwin L.

Marine propulsion

Screw propeller

Having means to control flow around propeller

440900, 440 70, B63H 116

Patent

active

050983210

ABSTRACT:
A propeller guard including a cylindrically shaped ring which includes a plurality of evenly spaced openings therethrough. The openings in the ring are formed so as to allow water to pass therethrough during operation so as to improve the performance characteristics, specifically acceleration, plaining, speed and steering, of the motor. The ring is attached to the motor by an attachment bracket which is designed to inhibit fatigue and cyclical loading failure caused by vibrations of the ring during use. The ring is formed in a generally tapered recangular cross section in order to minimize the drag and vibration characteristics thereof during use. The ring is formed so as to be attachable to an outboard motor to surround the propeller thereof to protect the propeller from underwater objects.

REFERENCES:
patent: 3508517 (1970-04-01), Hannan
patent: 3658028 (1972-04-01), Koons
patent: 3899992 (1975-08-01), Fuller
patent: 4240251 (1980-12-01), Fuller

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