Engine exhaust apparatus for water-jet propulsion boat

Details Engine exhaust apparatus for water-jet propulsion boat Engine exhaust apparatus for water-jet propulsion boat

1985-01-22

1986-12-23

Barefoot, Galen

Marine propulsion

Jet drive

Having means to increase fluid drive means efficiency

440 83, 440 89, 416 93A, B63H 11103

Patent

active

046310320

ABSTRACT:
An exhaust apparatus for a water jet propulsion boat having an engine exhaust passage provided inside an impeller shaft. The exhaust passage opens into the water jet at a position rearward of an impeller. Thus, the length of an engine exhaust pipe can be reduced, and it is possible to reduce the space required for installation of the exhaust apparatus. Since the engine exhaust gas is discharged into the water jet at a position to the rear of the impeller, no cavitation occurs at the impeller portion. Further, it is possible to utilize the engine exhaust gas as a gas layer constituting a pneumatic bearing for supporting the impeller shaft.

REFERENCES:
patent: 888390 (1908-05-01), Dalen
patent: 2213612 (1940-09-01), Ronning
patent: 3099241 (1963-07-01), MacFarlin
patent: 3763817 (1973-10-01), Francis
patent: 3943876 (1976-03-01), Kiekhaefer
patent: 4436514 (1984-03-01), Takahashi et al.

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