Rotatable jet propulsion unit for watercraft
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNoboru Kobayashi, Hirofumi Imaeda
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Abstract
A jet propulsion unit for powering a watercraft that is contained within a tunnel on the underside of the hull of the watercraft. The jet propulsion unit is rotatable about a longitudinally extending axis to rotate its water inlet opening from a downwardly facing position to a raised, out of the water storage and service position The drive for rotating the jet propulsion unit is positioned forwardly of the tunnel and out of the body of water in which the watercraft is operating.
Claims15
A jet propelled watercraft comprised of a hull, a jet propulsion unit comprised of a water inlet portion having a water inlet opening, an impeller portion receiving an impeller rotatable about a first axis extending longitudinally or said hull for drawing water through said water inlet opening and a discharge portion for discharging water moved by said impeller generally rearwardly to effect a propulsion force, and supporting means for supporting said jet propulsion unit upon said hull for rotation of at least said water inlet portion about a second axis form a downwardly facing propulsion position, said second axis extending substantially longitudinally relative to said hull and being offset form said first axis and above said first axis when said jet propulsion unit is in its downwardly facing position.
A jet propelled watercraft comprised of a hull defining a bulkhead, a tunnel formed on the underside of said hull and bounded at its front by said bulkhead, a jet propulsion unit having an impeller, supporting means for supporting said jet propulsion unit at least in part within said tunnel on the rear side of said bulkhead for rotary movement about an axis extending longitudinally of said hull between a normal propulsion position and a displaced position, propulsion means positioned forwardly of said bulkhead and driving said jet propulsion unit, motor means positioned forward of said bulkhead, and transmission means positioned entirely forwardly of said bulkhead for connecting said motor means to said jet propulsion unit for rotating said jet propulsion unit between its position.
Dependencies are inferred from the claim text.