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US 4,295,835 AGranted
High speed outboard drive unit
AssigneeBrunswick Corporation
InventorsCharles W. Mapes, Richard H. Snyder
Life of this patent
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Abstract
An engine driven outboard drive unit for propelling a watercraft has a vertical drive shaft driving a horizontal propeller shaft on which a propeller is mounted. The drive unit has a gearcase torpedo which houses both the propeller shaft and an annular exhaust gas passage. The exhaust passage discharges aft through the plane of the propeller. A small annular projection is formed around the aft end of the torpedo to improve high speed performance.
Claims8
An engine driven outboard drive unit for attachment to a watercraft comprising:
- (A) a generally vertical housing;
- (B) a generally vertical drive shaft journalled for rotation within said housing and driven by said engine;
- (C) a generally horizontal propeller shaft driven by the lower end of said drive shaft;
- (D) a propeller mounted on the aft end of said propeller shaft;
- (E) a streamlined torpedo of generally cylindrical shape fixed to the lower end of said housing with said propeller shaft journalled for rotation within said torpedo forward of said propeller, said torpedo comprising an engine exhaust passage for discharging exhaust gases through the plane of said propeller;
- and
- (F) an annular projection substantially encircling the aft end of said torpedo to prevent blowout at high speeds.
4 more elements
Dependencies are inferred from the claim text.