Driveshaft housing apparatus

Marine propulsion – Screw propeller – Having means to control flow around propeller

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114274, B63H 118

Patent

active

055163157

ABSTRACT:
Apparatus for further improving the efficiency of a propulsion unit having a driveshaft depending from the stern of a boat, while protecting flora and fauna in the water as well as the propulsion unit. A plate member has an upper end adapted to be positioned forward of a driveshaft housing, and to depend downwardly and rearwardly to terminate in a trailing lower end below a propeller. The plate member tapers outwardly along lateral edges from the upper end to the lower end to divert flora and fauna around and under a housing and a propeller attached thereto. A lower portion of the plate member is divided into a plurality of spaced plate-like components defining passageways therebetween to enable water to flow therethrough for more efficient operation of a propeller. At the same time, the forward surfaces of the plate-like components react with passage of water when under way to urge a boat's stern upwardly to a more efficient hull operating position.

REFERENCES:
patent: 2319640 (1943-05-01), Sink
patent: 2717570 (1955-09-01), Willoughby
patent: 4565533 (1986-01-01), Springer
patent: 5207605 (1993-05-01), Kroeber
patent: 5344346 (1994-06-01), Griffin

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