Rotor blade out-of-plane centrifugal pendulums

Details Rotor blade out-of-plane centrifugal pendulums Rotor blade out-of-plane centrifugal pendulums

1979-05-10

1980-12-16

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

042394562

ABSTRACT:
A helicopter having a main rotor lift unit includes a plurality of pendulus mass units (44, 46) mounted to oscillate in a plane perpendicular to the chord plane of the rotor blade (10). The mass units (44, 46) are connected to a rotatable shaft (28) which passes through or adjacent the blade grip (12) for each blade (10). Hubshear vibrations generated parallel to the axis of the rotor mast (18) are damped by the oscillating mass units (44, 46) which are tuned to minimize the vibrations transmitted from the lift unit to the fuselage.

REFERENCES:
patent: 2489343 (1949-11-01), Wasserman et al.
patent: 2519762 (1950-08-01), Hoffmann et al.
patent: 2795284 (1957-06-01), Sikorsky
patent: 2845131 (1958-07-01), Laufer
patent: 2934151 (1960-04-01), Jenney
patent: 3035643 (1962-05-01), Kelley et al.
patent: 3372758 (1968-03-01), Jenney
patent: 3540809 (1970-11-01), Paul et al.

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