Through-the-hub-propulsion unit exhaust

Details Through-the-hub-propulsion unit exhaust Through-the-hub-propulsion unit exhaust

1996-07-22

1999-01-12

Swinehart, Ed L.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

B63H 114

Patent

active

058578803

ABSTRACT:
An exhaust system for an outboard motor discharges exhaust gases in front of the propeller for improved acceleration. The discharge of exhaust gases upstream of the propeller produces a cavitation effect about propeller blades when accelerating from low speeds. As a result, the outboard motor accelerates more rapidly. At high speeds, the exhaust gases flow through the propeller hub and discharge behind the propeller. No substantial cavitation effect occurs about the blades, and thus, no significant loss of propulsion efficiency occurs when traveling at high speeds. When quickly reversing the propeller to produce a rapid braking force, the exhaust gases are directed away from the propeller blades to inhibit cavitation about the propeller blades and improve braking efficiency.

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