Stator and nozzle assembly for jet propelled personal watercraft

Details Stator and nozzle assembly for jet propelled personal watercraft Stator and nozzle assembly for jet propelled personal watercraft

1996-09-23

1998-02-03

Avila, Stephen

Marine propulsion

Jet drive

440 47, B63H 1100

Patent

active

057137692

ABSTRACT:
A jet propulsion system for a personal watercraft provides a converging stator that can be manufactured using die-cast manufacturing techniques. The stator preferably has a stator housing having a substantially cylindrical inner surface, a stator hub, and seven equally spaced stator vanes supporting the hub coaxially in the stator housing. The cylindrical inside surface of the stator housing does not extend rearward as far as a conventional housing for a converging stator. The coaxial hub has a converging diameter portion that is located at least in part downstream or rearward of the stator housing. Rearward of the stator housing, the stator vanes extend from the stator hub to an outer free edge. With this configuration, a converging stator can be manufactured using aluminum die-cast manufacturing techniques. The pump nozzle is a physically separate component from the stator, and includes a stator containment portion that is adapted to contain the outer free edges of the stator vanes rearward of the stator housing. The nozzle also contains the conventional acceleration portion downstream of the stator vanes. The stator vanes have a leading edge that is swept or crescent-shaped to reduce impeller blade noise.

REFERENCES:
patent: 3543713 (1970-12-01), Slade
patent: 3839859 (1974-10-01), Woell
patent: 4917637 (1990-04-01), Soga et al.
patent: 4925408 (1990-05-01), Webb et al.
patent: 5045002 (1991-09-01), Torneman et al.
patent: 5123867 (1992-06-01), Broinowski
patent: 5236379 (1993-08-01), Harris et al.
patent: 5310368 (1994-05-01), Kamitake

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