Exhaust means for marine propulsion unit

Details Exhaust means for marine propulsion unit Exhaust means for marine propulsion unit

1981-09-15

1984-03-13

Blix, Trygve M.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

440900, 416 93A, B63H 114

Patent

active

044365144

ABSTRACT:
Marine propulsion unit having a propeller assembly formed with exhaust gas passages through the propeller hub. An outer pipe is provided to encircle the propeller hub with a radial spacing and has a rear end extending beyond the rear end of the hub. The rear end of the exhaust gas is decreased in diameter at the rear end portion thereof so that the rear end opening of the outer pipe is smaller in diameter than the propeller hub so that the exhaust gas is forced to flow, during a reverse movement, from the exhaust gas passage in the hub to the space between the hub and the outer pipe. For facilitating manufacture of the outer pipe through conventional casting technique, the outer pipe is comprised of a front and rear parts which are mated together.

REFERENCES:
patent: 1252360 (1918-01-01), Moore
patent: 2213609 (1940-09-01), Ronning
patent: 3356151 (1967-12-01), Strang
patent: 3623447 (1971-11-01), Jacobson
patent: 3754837 (1973-08-01), Shimanckas
patent: 3788267 (1974-01-01), Strong
patent: 3871324 (1975-03-01), Snyder
patent: 4317655 (1982-03-01), Schiek

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