Impeller for marine waterjet propulsion apparatus

Details Impeller for marine waterjet propulsion apparatus Impeller for marine waterjet propulsion apparatus

1999-10-22

2000-10-24

Sotelo, Jesus D.

Marine propulsion

Screw propeller

440 67, 440 79, 416238, B63H 114

Patent

active

061358312

ABSTRACT:
An impeller for a marine waterjet propulsion system has blades that are configured to reduce cavitation, vibration, noise and physical damage to the major components of the propulsion system or host vessel of installation. The leading edge of each blade of the impeller is skewed forwardly over at least the outer 70% of its span, the forward skew being maximum at the tip and being not less than 35.degree.. The impeller has a blade area ratio of not less than 1.5. The chord lengths of each blade increase progressively from the point of minimum skew to the tip, resulting in reduced loading in the cavitation critical region. A partial or full tip band may be affixed to the blade tips.

REFERENCES:
patent: 3972646 (1976-08-01), Brown et al.
patent: 5226804 (1993-07-01), Do

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