| US 7,354,322 B1 | ||
| Watercraft and waterjet propulsion system | ||
| Reed Carver, Aurora, Ohio (US); and Brian M. Kolkowski, Leroy, Ohio (US) | ||
| Assigned to Orbital Research Inc., Cleveland, Ohio (US) | ||
| Filed on Sep. 23, 2003, as Appl. No. 10/668,426. | ||
| Int. Cl. B63H 11/00 (2006.01) | ||
| U.S. Cl. 440—38 [60/221; 440/67] | 7 Claims |
| 1. A watercraft comprising:
a hull;
an engine; and
a propulsor, the propulsor comprising an impeller, a water intake, and a steering nozzle, the steering nozzle having an inlet
and an exit, and an interior surface having an interior surface area and an exterior surface, the steering nozzle further
comprising at least one groove in the interior surface beginning near or at the exit and extending a distance along the interior
surface toward the inlet, the at least one groove having a groove area wherein when the steering nozzle is sectioned at least
about 75% of the groove area is located in any contiguous half of the total interior surface area of the steering nozzle
wherein the groove in the steering nozzle has a length and the length of the groove is between from about 0.001 r to about
15 r.
|