Jet-propelled boat

Details Jet-propelled boat Jet-propelled boat

1998-04-01

1999-12-07

Swinehart, Ed

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

440 1, 440 38, 60324, B63H 2132

Patent

active

059973730

ABSTRACT:
The expected performance of a jet-propelled boat is maintained, exhaust control valves are controlled and driven in an improved accuracy on the basis of the traveling speed of the jet-propelled boat. Thus, the fuel consumption is improved and the exhaust gas is purified. A two-stroke cycle engine drives a jet propulsion unit to make the jet propulsion unit suck in water and jet water therefrom to propel a hull of the boat. An exhaust control valve is disposed near the exhaust port of the engine to change the opening ratio of the exhaust port according to the operating condition of the engine. A driving mechanism for driving the exhaust control valve includes a hydraulic actuator. The power of water jetted by the jet propulsion unit represents the traveling speed of the jet-propelled boat accurately. The exhaust control valve is driven for opening and closing according to the pressure of water jetted by the jet propulsion unit to achieve the optimum exhaust control by the exhaust control valve without entailing an excessive increase in the output of the engine.

REFERENCES:
patent: 4912930 (1990-04-01), Ueda
patent: 4999999 (1991-03-01), Takahashi et al.
patent: 5244425 (1993-09-01), Tasaki et al.

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