Collar for redirecting propeller energy

Details Collar for redirecting propeller energy Collar for redirecting propeller energy

1976-07-19

1977-09-06

Kunin, Stephen G.

Ships

Building

Canal and ferry boats

114166, B63H 514

Patent

active

040460975

ABSTRACT:
A rigid cylindrical collar with an inside diameter slightly larger than the outside diameter of a propeller which is mounted over a propeller and is used singly or in combination with a flexible extension thereto for maximizing the efficiency of propeller blades. The invention is adaptable to watercraft or to aircraft so as to prevent water or air from slipping off the ends of propeller blades so as to redirect energy lost as a result of slipping off the ends of propeller blades in the direction useful for advancing a water or air vehicle. The flexible extension is usable primarily on large watercraft, such as tug boats, ocean vessels and barges, and the like, and could be used with or without a rudder in order to steer a boat in the direction desired.

REFERENCES:
patent: 899359 (1908-09-01), Wadagaki
patent: 2135162 (1938-11-01), Benson
patent: 3907219 (1975-09-01), Pharris

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