Variable pitch propeller

Details Variable pitch propeller Variable pitch propeller

1987-09-04

1988-12-20

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Radially extensible or retractible rotor working member

Having pitch adjustment

416 87, 416167, B63H 106

Patent

active

047922796

ABSTRACT:
An automatic variable pitch propeller comprising a central hub defining an axis of propeller rotation and a plurality of blades connected to and extending from said central hub substantially normal to the axis of rotation, each blade being mounted for rotation about a pitch axis, means to translate outward movement of that blade resulting from centrifugal forces imposed on that blade by rotation of the propeller into a force tending to rotate that blade about its pitch axis toward a feathered pitch condition, the force being opposed by a feathering force acting at a center pressure of the blade offset from the pitch axis, caused by resistance to rotation of said propeller and tending to decrease blade pitch toward a feathered condition.

REFERENCES:
patent: 1449685 (1923-03-01), Luther et al.
patent: 1953682 (1934-04-01), Kelm
patent: 2244994 (1941-06-01), Humphrey
patent: 2282077 (1942-05-01), Moore
patent: 2415421 (1947-02-01), Filippis
patent: 2998080 (1961-08-01), Moore, Jr.
patent: 3853427 (1974-12-01), Holt

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