Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Lead-lag type rotor blade movement
Patent
1974-10-10
1976-12-28
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Lead-lag type rotor blade movement
416141, 416138, B64C 2744
Patent
active
039998860
ABSTRACT:
Improved stability is provided in a hingeless helicopter rotor by inclining the principal elastic flexural axes and coupling pitching of the rotor blade with the lead-lag bending of the blade. The primary elastic flex axes can be inclined by constructing the blade of materials that display non-uniform stiffness and the specification describes various cross section distributions and the inclined flex axes resulting therefrom. Also described are arrangements for varying the pitch of the rotor blade in a predetermined relationship with lead-lag bending of the blade, i.e., bending of the blade in a plane parallel to its plane of rotation.
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Bousman William G.
Hodges Dewey H.
Ormiston Robert A.
Peters David A.
Brekke Darrell G.
Grafel Gary F.
Manning John R.
Powell Jr. Everette A.
The United States of America as represented by the Administrator
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