B - Operations – Transporting – 63 – H
Patent
B - Operations, Transporting
63
H
115/6
B63H 1/20 (2006.01) B63H 1/28 (2006.01) F02B 61/04 (2006.01)
Patent
CA 1140402
ABSTRACT OF THE DISCLOSURE A boat motor exhaust system has an exhaust passage extending through the hub of a propeller of an outboard motor, a Z-motor or the like. By means of a valve system which is actuated on reversal of the direction of rotation of the propeller, the exhaust gas is discharged into a region outside the suction zone of the propeller when the latter rotates backwards and flows outwardly through the propeller hub in the normal manner when the propeller rotates forwardly. This provides a significant increase in the propulsion during reverse motion. In one embodi- ment the valve system comprises a rotary valve closure member at the rear end of the propeller shaft and an auxiliary exhaust gas outlet for discharging the exhaust gas during reverse motion. In another embodiment, the valve system comprises part of the hub of the propeller, which is movable axially of the propeller shaft, and a closure disc at the rear end of the propeller, which disc closes the exhaust passage on movement of the propeller along the shaft into a first end position and opens the passage on movement of the propeller into an opposite end position. The movement of the propeller into the first end position opens an annular auxiliary gas outlet opening between the hub and a propeller sleeve forming part of a boat motor.
344094
Finze Fritz-Johann
Kirby Eades Gale Baker
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