Marine drive unit with reduced drag

Details Marine drive unit with reduced drag Marine drive unit with reduced drag

1988-04-11

1990-02-06

Basinger, Sherman D.

Marine propulsion

Screw propeller

Propulsion unit casing

440900, 440 78, B63H 2110

Patent

active

048985538

ABSTRACT:
A marine drive (2) includes a lower drive unit (4) having a strut portion (6) and a torpedo portion (10) which are blended along a blended portion (30) such that all horizontal cross-sections through the blended portion and the strut portion have outer profiles defining smooth continuous non-concave surface elements continuously curved convex along the entire front to back length thereof, and such that all vertical cross-sections through the strut portion, blended portion and torpedo portion have outer profiles defining a central zone (62) of concave outer surface elements wherein the degree of concave curvature continually increases front to back.

REFERENCES:
patent: 1890879 (1932-12-01), Johnson et al.
patent: 2021309 (1935-11-01), Irgens
patent: 4636175 (1987-01-01), Frazzell et al.

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