Texture gearcase for a marine propulsion system

Details Texture gearcase for a marine propulsion system Texture gearcase for a marine propulsion system

1997-12-02

1999-10-19

Basinger, Sherman

Marine propulsion

Screw propeller

Propulsion unit casing

440 89, B63H 2032, B63H 2132

Patent

active

059678666

ABSTRACT:
A lower unit for a marine propulsion system has a flow disrupter positioned along the side wall of the vertical strut above the torpedo gearcase. The strut has a high pressure side and low pressure side which results from the strut being positioned at an angle with respect to the direction of boat travel in order to compensate for steering torque. The flow disrupter is positioned on the low pressure side of the strut, and promotes the separation of water passing over the vertical strut in a controlled manner, thereby reducing steering jerks during acceleration due to dramatic hydrodynamic flow changes. The flow disrupter consists of a series of steps or textured areas positioned along the aft section of the vertical strut. In a preferred embodiment, each of the steps contains a vent passage permitting exhaust to exit the strut through the steps to further promote controlled separation of water passing over the strut.

REFERENCES:
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patent: 4636175 (1987-01-01), Frazzell et al.
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patent: 5085603 (1992-02-01), Haluzak
patent: 5219272 (1993-06-01), Steiner et al.
patent: 5277634 (1994-01-01), Calamia et al.
patent: 5344349 (1994-09-01), Meisenburg et al.

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