Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Including movement limit stop or damping means
Patent
1976-06-14
1978-02-14
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Including movement limit stop or damping means
416148, B64C 2752
Patent
active
040736008
ABSTRACT:
A damping mechanism is disclosed for damping the oscillations of the rotor hub which are coupled with periodic motions of the fuselage when on the ground, known as ground resonance, and a waddle when in the air. The rotor includes a freely tiltable rotor head mounted on a non-rotatable universal joint having an outer gimbal ring and an inner ring carried by a pylon. The damping mechanism connected between a gimbal ring and the pylon combines the action of a fluid dashpot in tandem with spring means the output of which is connected into the linkage between the pilot stick and the swash plate. The tandem combination of dash pot and spring means delays the signal to the swash plate by about 90.degree. to insert a corrective movement into the swash plate with feathering of the blades to tilt the rotor thrust vector which damps the oscillations of the rotor hub. The invention includes the damping mechanism per se and its combination with the rotor and with the swash plate.
REFERENCES:
patent: 2173291 (1939-09-01), Ash
patent: 2550538 (1951-04-01), Doman
patent: 2677429 (1954-05-01), Laufer
patent: 2687856 (1954-08-01), Doman
patent: 2861640 (1958-11-01), DuPont
patent: 3288227 (1966-11-01), Derschmidt
patent: 3477665 (1969-11-01), Legrand
patent: 3960348 (1976-06-01), Fowler et al.
patent: 4004757 (1977-01-01), Doman
Gallagher William
Montstream John M.
Powell Jr. Everette A.
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