Liquid jet propulsion
OwnerRobert L. Jordaninventor
Life of this patent
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Abstract
The liquid jet propulsion unit is driven by the conventional outboard motor. The drive of the motor directly rotates an impeller which draws up the water into an impeller chamber where it is moved by isentropic radially extending impeller blades. These blades have three progressive stages from inlet to outlet, i.e., axial, transition, and radial. In the delivery of the intake liquid to the outlet chamber the twisting turbulence is reduced and is straightened out and is further straightened by the outlet vane to give a stream greater lineal length and force through the outlet nozzle, which drives the craft forward. Since the vertical distance between intake and outlet is only a matter of a few inches, shallow draft boats can be driven successfullyin shallow and rocky water.
Claims7
A jet propulsion unit for coupling to a conventional power source having a drive shaft, a housing for said unit having a chamber in axial alignment with said drive shaft, said chamber being in the shape of a truncated cone for substantially the first portion of its height with the widest diameter being at the inlet which is open to receive fluid and continuing upwardly into a cylindrical shape for the remainder of its enclosure, a tangential outlet passage from the uppermost portion of said cylindrical portion of said chamber, an outlet tubular passage in said housing cooperating with said tangential outlet said tubular passage having an exhaust outlet, and impeller conforming in structure to the shape of the said chamber connected to said drive shaft for rotation in said chamber, said impeller having a plurality of radially offset blades shaped in a true helix for the first cone shaped portion of said chamber continuously passing to transition curves for the second and beginning of the cylindrical portion of said chamber with continuously substantially vertical radial blade portions for the said cylindrical portion of the chamber.
Dependencies are inferred from the claim text.