Jet propelled watercraft

Marine propulsion – Jet drive – Direction control for fluid jet

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Details

440 38, 440 89, B63H 1111

Patent

active

053760280

ABSTRACT:
A number of embodiments of jet propelled watercraft having one or more jet propulsion units positioned within a tunnel formed on the under side of the hull. The jet propulsion units are pivotal about a transverse horizontally extending axis between a lowered driving position and a raised out of the water position. The tunnel, at least in one embodiment, is defined by an upwardly inclined surface so that the tunnel is higher at its rear than at its front. This elevated portion precludes water from splashing back into the passenger compartment when the watercraft is suddenly decelerated and also provides minimum intrusion into a rear positioned passenger compartment. When the jet propulsion unit is in its lowered position it extends at least in part through the transom of the hull via an opening that is defined by a pair of spaced apart sidewalls that are spaced more closely than the sidewalls which define the tunnel. A dual engine jet propulsion unit watercraft is also disclosed as is an exhaust system which permits the exhaust gases to exist through the transom freely regardless of whether the watercraft is operating in a forward or in a reverse drive mode.

REFERENCES:
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patent: 4568291 (1986-02-01), Nelson
patent: 4744778 (1988-05-01), Porter
patent: 4942838 (1990-07-01), Boyer et al.
patent: 5096961 (1992-03-01), Tazaki et al.

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