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US 5,310,369 AGranted
Water jet propulsion unit
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorNoboru Kobayashi
Life of this patent
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorNoboru Kobayashi
Estimating the term…
A number of embodiments of watercraft having jet propulsion units contained within a tunnel in the hull and wherein the jet propulsion unit is pivotal about a first transversely extending horizontal pivot axis for bringing the jet propulsion unit through trim adjusted positions to an upward out of the water position. In addition, the jet propulsion unit is rotatable about a horizontal longitudinally extending axis so that its downwardly facing water inlet portion may be rotated upwardly for access through an access opening in the hull for servicing. In one embodiment, the jet propulsion unit is only rotatable about the horizontal longitudinally extending axis. A number of embodiments of rudder assemblies are also depicted supported by the steering nozzle for generating steering effects when the steering nozzle is not generating a significant steering effect and which may be pivoted to an out of the water position for protection when underwater obstacles are struck.
A jet propelled watercraft comprising a hull, a jet propulsion unit having a water inlet portion defining a water inlet opening through which water may be drawn from a body of water in which said hull is operating, an impeller portion containing an impeller for pumping water and a discharge portion through which water pumped by said impeller is discharged, means for supporting said jet propulsion unit from said hull for movement of at least said water inlet portion from a downwardly facing position to an elevated position, said hull having a portion bounding at least the sides of said water inlet portion when in its downwardly facing position, and anti-leakage means for providing an area extending between the periphery of said water inlet opening of said jet propulsion unit and said hull portion at least when said water inlet portion is in its downwardly facing position for preventing the ingestion of air into said water inlet opening around said water inlet opening.
A watercraft having a hull defining a tunnel at the rear end thereof which tunnel terminates at a rearwardly facing opening in a transom of said hull, a passenger compartment in said hull into which the portion of said hull defining said tunnel protrudes with passenger receiving areas on opposite sides of said tunnel and which extend rearwardly to said transom, a jet propulsion unit having a water inlet opening through which water may be drawn and a discharge nozzle from which water is discharged for the propulsion of said hull supported within said hull at least in part in said tunnel for pivotal movement about a transverse, horizontal axis between a lowered drive position positioned substantially within said tunnel and wherein said water inlet opening is substantially flush with the lower portion of said hull and said discharge nozzle registers with said transom opening and a raised storage position disposed entirely within said tunnel, said tunnel being defined at its upper extremity by an upper surface that is substantially higher above the adjacent bottom of the hull at the rear of said tunnel than at the front thereof and which upper surface overlies said jet propulsion unit in its raised storage position and an access opening formed forwardly in said hull from said upper surface.
Dependencies are inferred from the claim text.