Trim adjusting system for jet propulsion boat
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsHideki Kishi, Hirofumi Imaeda
Life of this patent
Estimating the term…
Abstract
A small jet propelled watercraft having a hull undersurface provided with a plurality of stripes and a step at the rear end thereof to reduce porpoising without increasing drag. The watercraft is propelled by a jet propulsion unit having a discharge nozzle which is capable of trim adjustment and which is controlled by a twist grip control mounted on its steering handlebar.
Claims16
A watercraft comprised of a hull having a V-shaped bottom with a transversely extending step at the rear thereof for reducing the drag of the hull and for reducing the likelihood of porpoising, and a jet propulsion unit mounted within said hull for propelling said hull, said jet propulsion unit having a water inlet opening formed in the underside of said hull forwardly of said step for drawing water from the body of water in which said watercraft is operating, an impeller fox pumping water through said water inlet opening, and a discharge nozzle disposed to the rear of said step for discharging the pumped water for providing a propulsion force for said watercraft, said step extending transversely outwardly beyond and to the rear of the sides of said water inlet opening.
A jet propelled watercraft comprised of a hull, a jet propulsion unit mounted in said hull and having a downwardly facing water inlet opening through which water is drawn, an impeller driven by an engine for drawing water through said inlet opening, and a discharge nozzle through which the water is discharged and which discharge nozzle is pivotal about a transversely extending horizontal trim axis for adjusting the trim of said watercraft, a handlebar assembly for steering the watercraft, and a twist grip trim control rotatably journaled on said handlebar assembly and connected to said discharge nozzle for only adjusting the trim thereof.
Dependencies are inferred from the claim text.