Marine propulsion – Jet drive – Having means to increase fluid drive means efficiency
Patent
1992-10-14
1994-01-11
Sotelo, Jesus D.
Marine propulsion
Jet drive
Having means to increase fluid drive means efficiency
60221, B63H 11103
Patent
active
052776310
ABSTRACT:
A water jet propulsion assembly for a jet ski-type watercraft includes an annular duct including a first section within which an impeller is located, a second section having a group of sloping vane members extending radially therethrough and a third section formed with a group of straight vane member extending partially radially inwardly from the inside surface of the outermost duct wall. The duct terminates in a nozzle for expelling water flowing therethrough. The second section of the duct includes radially inner and outer wall portions and the inner portion has a cap member secured to a rear end thereof. The cap member extends into the third duct section and is formed with another group of straight vane member which extend radially outwardly. The vane members function to convert the swirling water flow created by the impeller into a linear flow that is directed through the nozzle. The sloping and straight vane members are divided to permit more efficient molding of the vane sections by die casting.
REFERENCES:
patent: 3083529 (1963-04-01), Hamilton
patent: 3328961 (1967-07-01), Aschauer
patent: 3389558 (1968-06-01), Hall
Sanshin Kogyo Kabushiki Kaisha
Sotelo Jesus D.
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