Marine propulsion – Jet drive – Direction control for fluid jet
Patent
1997-01-16
1998-05-19
Avila, Stephen
Marine propulsion
Jet drive
Direction control for fluid jet
440 42, B63H 1111
Patent
active
057528640
ABSTRACT:
A reverse mechanism for a jet propelled watercraft includes a reverse gate that provides low restriction to the flow of water through the jet pump, and also provides significant steering characteristics. The reverse gate has a deflector surface with a vertical jet divide that divides the deflector surface. Both sides of the deflector surface are in the form of a simple curve. In the preferred embodiment, the simply-curved deflector surfaces slant inward towards a central apex which serves as the vertical jet divide. The deflector surface spans between a starboard side support structure and a port side support structure which are pivotally mounted along a horizontal axis so that the reverse gate can be moved between a full-up position and a full-down position rearward of the jet pump. Both the starboard side support structure and the port side support structure include apertures therethrough which allow a portion of the jet flow to exit laterally from the reverse gate. When the reverse gate is in the fully down position, a portion of the jet flow is redirected forward to provide reverse thrust, and a portion of the jet of water is deflected laterally to port and laterally to starboard proportionally in accordance with the direction of the jet pump rudder.
REFERENCES:
patent: 3937172 (1976-02-01), Castoldi
patent: 4004541 (1977-01-01), Onal
patent: 4252075 (1981-02-01), Kobayashi
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patent: 4538997 (1985-09-01), Haglund
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Kodial 110 Waterjet Propulsion Unit, Kodiak, pp. 15, 18, 26, 27, admitted prior art.
High Thrust Marine Jet Propulsion Unit, Model 1031, Hamilton Jet Brochure, BAS 5M Jun. 1985.
Hamilton Jet 770 Series Jet Units, Hamilton Jet Brochure, BP10m Sep. 1979.
Christians Richard P.
Grinwald Peter P.
Jones James R.
Avila Stephen
Brunswick Corporation
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