Exhaust system for outboard drive

Marine propulsion – Means for accomodating or moving engine fluids – Means for handling exhaust gas

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440 80, B63H 2132

Patent

active

057660484

ABSTRACT:
An exhaust system for an marine drive discharges exhaust gases between front and rear propellers of a counter-rotating propeller system. The discharge of exhaust gases between the propellers produces a cavitation effect about the rear propeller when accelerating from low speeds. As a result, the drive of the propellers accelerates more rapidly. At high speeds, however, the velocity of the exhaust gases carries the gases over the rear propeller principally in the vicinity of the rear propeller hub. No substantial cavitation effect occurs about the blades of the rear propeller at high speeds. As a result, the discharge of exhaust gases between the propellers causes no significant loss of propulsion efficiency when traveling at high speeds.

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