Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Resilient bias or mount
Patent
1981-07-02
1984-02-07
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Resilient bias or mount
416141, 244 1727, B64C 2704
Patent
active
044300450
ABSTRACT:
A helicopter power train is disclosed in which the rotor tip-path plane (218) inclination relative to the helicopter air frame (200) is achieved by blade flapping motions distributed through a plurality of drive train components rather than through blade flapping motion about a single flap hinge. Rotor tip-path plane flapping is accommodated by resilient transmission mounts (24, 25, 26 and 27) to the extent of approximately 25%, by a flexible mast (208) extending upward from a transmission (11) to the extent of approximately 20%, by a hub (213) having flexure members to the extent of approximately 50% and by flexible blade structure (214, 216) having beam bending to accommodate approximately 5% of the rotor flapping motion. The hub (213) comprises a plurality of yokes (260, 262) each of which is an elongated plate having flexure members to accommodate blade flapping. The yokes (260, 262) are stacked on the mast (208) to form the hub (213).
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Bell Helicopter Textron Inc.
Powell Jr. Everette A.
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