Flexbeam for rotor blades of helicopter and method for fabricati

Details Flexbeam for rotor blades of helicopter and method for fabricati Flexbeam for rotor blades of helicopter and method for fabricati

1989-01-05

1990-01-09

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416141, B64C 2738

Patent

active

048924610

ABSTRACT:
A flexbeam for rotor blades of a helicopter comprises a flapping flexible structure forming a mast mounting and flapping part, a flexible structure forming a feathering and lead-lag motion part coupled with the flapping flexible structure, and a rotor blade mounting part located at the free end of the flexible structure and adapted to be coupled with a rotor blade. The feathering and lead-lag motion part comprises an elongated central member made of a composite fiber material, and a pair of elongated frame members disposed along the longitudinal sides of the central member. The frame members are each made of loops of unidirectional composite fiber material and has a Y-shaped cross section. The feathering and lead-lag motion part is fabricated by integrally joining the central member and the frame members along the longitudinal sides of the latter. The Y-shaped cross section has a pair of parallel ribs extending away from the central member. The above construction enables easy fabrication and reduction of weight of the flexbeam.

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