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US 3,943,876 AGranted
Water jet boat drive
AssigneeKiekhaefer Aeromarine Motors, Inc.
InventorElmer Carl Kiekhaefer
Life of this patent
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AssigneeKiekhaefer Aeromarine Motors, Inc.
InventorElmer Carl Kiekhaefer
Estimating the term…
A water-jet is mounted rigidly entirely outboard of the boat and driven from an inboard engine by an interconnecting chaft through the transom. The tail nozzle is mounted concentric of and spaced from the pump chamber of the jet and extends rearwardly therefrom axially thereof. A butterfly trim vane is pivotally mounted on a transverse horizontal axis in the tail nozzle and is adapted to close the nozzle for blocking the jet and compelling a reverse flow of the water from the pump through passages between the pump chamber and tail nozzle. A steering vane is mounted on a vertical axis rearwardly of the tail nozzle and carries a rudder disposed beneath the jet steering vane for steering during reversal of the jet. The engine exhaust is introduced to the jet stream within the tail nozzle and has a by-pass operable during reverse of the jet stream.
A water jet drive for a boat, adapted to be secured to the back of the boat transom to be driven by an inboard powered shaft extending through a sealed opening in the transom near the bottom of the boat and comprising when installed on a boat, a tubular housing fixedly secured to the boat transom and having an open water pickup inlet at its forward end facing downwardly at the general level of the bottom of the boat and to the rear of the transom, said housing extending rearwardly and upwardly from said inlet and having an impeller chamber terminating in a jet nozzle generally above the plane of the bottom of the boat and disposed axially at a slight angle rearwardly and upwardly of said plane whereby the water flows in a substantially straight path upwardly and rearwardly from said inlet to and through said nozzle, a substantially non-flexible drive shaft extending through the boat transom and into said impeller chamber axially of said jet nozzle, and an impeller carried by said shaft in said impeller chamber.
A water jet drive for a boat, adapted to be secured to the back of the boat transom to be driven by an inboard powered shaft extending through a sealed opening in the transom near the bottom of the boat and comprising when installed on a boat, a tubular housing rigidly secured to the boat transom and having an open water pickup inlet at its forward end facing downwardly at the general level of the bottom of the boat and to the rear of the transom, said housing extending rearwardly and upwardly from said inlet and having an impeller chamber terminating in a jet nozzle generally above the plane of the bottom of the boat and disposed axially at a slight angle rearwardly and upwardly of said plane, a drive shaft extending through the boat transom and into said impeller chamber axially of said jet nozzle, an impeller carried by said shaft in said impeller chamber, an auxiliary jet nozzle disposed rearwardly in tandem to said first named jet nozzle and generally axially aligned therewith with the skirt of said auxiliary jet nozzle extending forwardly over and generally concentrically spaced from said first named jet nozzle and rigidly secured thereto, and means to close said auxiliary jet nozzle to force the water discharged from said first named jet nozzle to reverse its course and to be discharged forwardly through said space between said nozzles.
Dependencies are inferred from the claim text.