Pitch control system for variable pitch propeller

Details Pitch control system for variable pitch propeller Pitch control system for variable pitch propeller

1983-11-07

1985-08-06

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416 47, 416153, B64C 1140

Patent

active

045332967

ABSTRACT:
A propeller pitch control system having a mechanical low pitch stop which includes an electrical backup therefor. The backup comprises an electrically operatable means (245) to effect blade pitch adjustment toward feather under conditions of failure of the low pitch stop indicated by propeller operation at pitch angles in the range of beta operation, but power settings in the range of normal engine speed governor pitch control. Such operating conditions actuate a pair of switches (190 and 195) connecting the means (245) to a voltage source to increase blade pitch toward feather, thereby preventing overspeed operation of the propeller.

REFERENCES:
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patent: 2632516 (1953-03-01), Longfellow
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patent: 2809702 (1957-10-01), Lambeck et al.
patent: 2840169 (1958-06-01), Farkas
patent: 3102596 (1963-09-01), Newton et al.
patent: 3163232 (1964-12-01), Grindle

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