Anhedral bifilar

Details Anhedral bifilar Anhedral bifilar

1975-11-13

1976-10-26

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

Self-shifting or selectively adjustable mass

416500, B64C 2732

Patent

active

039880745

ABSTRACT:
A multibladed helicopter rotor carries at least three bifilar absorbers which are tuned to eliminate in-plane vibrations of the rotor that otherwise would be transmitted to the helicopter fuselage. By drooping the radial support arms for the absorbers out of the plane normal to their axis of rotation, the resultant of the centrifugal forces acting on the pendulous elements of the absorbers and the weight of these elements acts normal to the axes of the tuning pins of the absorbers which minimizes internal frictional damping in the absorbers.

REFERENCES:
patent: 2519762 (1950-08-01), Hoffmann et al.
patent: 3372758 (1968-03-01), Jenney
patent: 3540809 (1970-11-01), Paul et al.
patent: 3874818 (1975-04-01), Saunders et al.
patent: 3887296 (1975-06-01), Mills et al.
patent: 3910720 (1975-10-01), Vincent et al.
patent: 3932060 (1976-01-01), Vincent et al.
B576,158, Mar. 1976, Eastman et al., 416/145.

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