Marine propulsion – Jet drive – Having means to increase fluid drive means efficiency
Patent
1996-02-29
1997-10-21
Basinger, Sherman
Marine propulsion
Jet drive
Having means to increase fluid drive means efficiency
60221, B63H 11103
Patent
active
056790350
ABSTRACT:
An improved discharge nozzle and method for operating a marine jet propulsion system are disclosed designed to allow the pump to operate more efficiently. The discharge nozzle includes an outer nozzle structure mounted immediately downstream of the pump diffuser vanes which progressively reduces in diameter towards its rear exit opening. A needle is mounted within the diffuser hub and travels in axial alignment within the outer nozzle structure to adjust the effective opening of the discharge nozzle according to a pump affinity relationship, so that the pump is always operating at the most efficient head and flow for its current shaft RPM, regardless of boat speed or pressure recovery in the inlet duct. This is especially desirable when the discharge nozzle is used in combination with a large effective nozzle area, a large pump, and an inlet duct which is efficient in recovering the total dynamic head of the oncoming water at the inlet of the method discloses how the nozzle is used to allow the pump to operate more efficiently. A method for maintaining the pump efficiency of a jet propulsion system for a watercraft including an inlet duct, a pump, and an adjustable discharge nozzle is also disclosed.
REFERENCES:
patent: 3214903 (1965-11-01), Cochran
patent: 3314391 (1967-04-01), Duport
patent: 4775341 (1988-10-01), Tyler et al.
patent: 5244425 (1993-09-01), Tasaki et al.
patent: 5338234 (1994-08-01), Nanami
patent: 5401198 (1995-03-01), Toyohara et al.
Basinger Sherman
Storwick Robert M.
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