Exhaust system for small watercraft

Details Exhaust system for small watercraft Exhaust system for small watercraft

2011-05-03

2011-05-03

Olson, Lars A (Department: 3617)

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

C440S08900C

Reexamination Certificate

active

07934965

ABSTRACT:
An exhaust system for a small watercraft for effectively reducing exhaust noise and allowing a high output of an engine to be easily obtained at the time of high speed operation. An exhaust outlet of an exhaust pipe extending from an engine provided in a watercraft body is disposed at a position that allows it to sink in the water at the time when a travel speed of the watercraft body is a predetermined speed or less. The exhaust outlet is raised above the water at the time when the travel speed of the watercraft body exceeds the predetermined speed. An open surface of the exhaust outlet is offset toward a side wall surface of a pump chamber from a center of a jet pump in the pump chamber and is made oblique toward the side wall surface toward which the open surface of the exhaust outlet is offset.

REFERENCES:
patent: 5879211 (1999-03-01), Koyanagi
patent: 6679742 (2004-01-01), Yokoya et al.
patent: 6800005 (2004-10-01), Yokoya
patent: 7056174 (2006-06-01), Yokoya et al.
patent: 7156710 (2007-01-01), Yokoya et al.
patent: 2003-54493 (2003-02-01), None

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