Composite flexbeam for a bearingless helicopter rotor
First Claim
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1. A flexbeam for a helicopter rotor system comprising:
- a beam of unidirectional composite fibers extending longitudinally along the length of said beam and bound in an epoxy matrix and having two horizontal faces and two vertical faces, a hub section, a flap flexure section outboard of said hub section, a lag-torsion section outboard of said flap flexure section, and a blade attachment section outboard of said lag-torsion section; and
a rib of unidirectional composite fibers bound in a urethane matrix and extending longitudinally along the length of said rib and longitudinally of said beam and bonded to one of said horizontal faces of said beam at said lag-torsion section.
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Abstract
A flexbeam 16 for a bearingless helicoptor rotor includes a composite beam 28, composed of unidirectional fibers bound in an epoxy matrix, having ribs 32, composed of unidirectional fibers bound in a urethane matrix, bonded to each horizontal face at the section of the beam 28 which accommodates lead-lag torsion.
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Citations
5 Claims
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1. A flexbeam for a helicopter rotor system comprising:
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a beam of unidirectional composite fibers extending longitudinally along the length of said beam and bound in an epoxy matrix and having two horizontal faces and two vertical faces, a hub section, a flap flexure section outboard of said hub section, a lag-torsion section outboard of said flap flexure section, and a blade attachment section outboard of said lag-torsion section; and a rib of unidirectional composite fibers bound in a urethane matrix and extending longitudinally along the length of said rib and longitudinally of said beam and bonded to one of said horizontal faces of said beam at said lag-torsion section. - View Dependent Claims (2, 3, 4, 5)
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Specification