Exhaust discharge for a pump jet

Details Exhaust discharge for a pump jet Exhaust discharge for a pump jet

1992-03-17

1993-12-28

Swinehart, Edwin L.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

440900, B63H 2132

Patent

active

052734676

ABSTRACT:
A marine pump jet apparatus is described which is attached to the lower unit of a conventional outboard motor. The pump jet, which replaces the usual propeller element, consists of an axial flow pump containing a bladed impeller and stator vanes enclosed in a housing. In conventional outboards, exhaust gas flows downward from the power head through a duct in the motor and rearward through ducts in the motor gear case and the propeller hub to be discharged under water. In the present apparatus, before the exhaust reaches the gearcase, it is directed into a diversion passage which causes it to exit (still under water) above the upper surface of the pump jet. A trough is provided in the upper surface of the pump jet housing. The diversion passage directs a portion of the exhaust stream into the trough, thereby reducing drag on the motor.

REFERENCES:
patent: 3249083 (1966-05-01), Irgens
patent: 3849982 (1974-11-01), Hall
patent: 3943876 (1976-03-01), Kiekhaefer
patent: 4023353 (1977-05-01), Hall
patent: 4600394 (1986-07-01), Dritz
patent: 5145428 (1992-09-01), Harrison

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