Jet propulsion system
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorTetsuya Ishino
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Abstract
A jet propulsion system for a small watercraft including an arrangement for isolating the sound of water flowing through the water inlet portion of the jet propulsion unit from the occupants of the watercraft. This silencing is provided by providing a double wall on at least the portion of the jet propulsion unit water inlet portion juxtaposed to the passenger compartment to provide an insulating jacket. Water may be filled in the insulating jacket and this water can be derived by filling it with the coolant which is circulated through the engine.
Claims11
A watercraft comprised of a hull, a jet propulsion unit mounted by said hull for propulsion of said watercraft, said jet propulsion unit being comprised of an outer housing comprised of a water inlet portion forming a water inlet opening and water inlet duct for drawing water from the body of water in which said watercraft is operating, said water inlet portion of said outer housing terminating at an outer housing impeller portion containing an impeller for pumping the water and an outer housing discharge nozzle, and means for providing with said outer housing an enclosed sound insulation jacket extending around at least a portion of said jet propulsion unit outer housing from substantially said water inlet opening to substantially said impeller portion.
Dependencies are inferred from the claim text.