Helicopter rotors

Details Helicopter rotors Helicopter rotors

1977-07-08

1978-12-12

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416138, 416141, B64C 2738, B64C 2748

Patent

active

041294033

ABSTRACT:
A helicopter rotor includes, for each of a plurality of rotor blades, a generally radially extending flexure member to accommodate blade flap movements, a feathering hinge for pitch change movements and an elastic shear mounting located within the feathering hinge to accommodate rotor blade lead and lag movements. Spaced-apart elastomeric bearings are utilized in the feathering hinge, and the elastic shear mounting is associated with the outer elastomeric bearing and is arranged to be substantially equally resilient in both the lead/lag and flap planes. The arrangement facilitates the incorporation of automatic damping in the lead/lag plane by selection of suitable material for the elastic shear mounting.

REFERENCES:
patent: 3026942 (1962-03-01), Cresap
patent: 3556673 (1971-01-01), Killian
patent: 3700352 (1972-10-01), Gorndt
patent: 3790302 (1974-02-01), Pascher
patent: 3807896 (1974-04-01), Johnson
patent: 3926536 (1975-12-01), Ciastula
patent: 3942910 (1976-03-01), Snyder et al.
patent: 4012169 (1977-03-01), Mouille et al.
patent: 4028002 (1977-06-01), Finney et al.

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