Lower-unit for marine outboard drive

Details Lower-unit for marine outboard drive Lower-unit for marine outboard drive

1995-07-14

1996-12-17

Sotelo, Jesus D.

Marine propulsion

Screw propeller

Propeller arrangement

B63H 507

Patent

active

055847340

ABSTRACT:
A lower unit of a marine outboard drive has a unique shape which inhibits boundary layer separation within the water flow stream over the lower unit regardless of the trim position of the lower unit. The lower unit includes a nacelle. The front nose of the nacelle blends smoothly into a supporting strut in a vertical direction to form a generally teardrop-like cross-sectional shape. The front end of the strut fairs the nacelle body from its sharp leading edge to give the lower unit a streamline shape at trim angles approaching a full trim up position of the lower unit. The leading edge of the strut also slopes rearward away from the front nose of the nacelle. The shape of this junction between the upper side of the nacelle and the strut front end gives the front end of the lower unit a generally constant streamline shape as the lower unit rotates through a range of trim angle positions.

REFERENCES:
patent: 4810218 (1989-03-01), Iwai
patent: 4832635 (1989-05-01), McCormick
patent: 4898553 (1990-02-01), Bankstahl

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