![]() Extension-torsion elastic coupling (blade pitch decreases due to tension) decreases regressive lag mode stability in both airborne and ground contact conditions. The negative pitch-lag coupling has a detrimental effect on ground resonance stability. Negative pitch-lag elastic coupling has a stabilizing effect on the regressive lag mode in hover and forward flight. Air resonance stability is diminished by elastic pitch-flap couplings in hover and forward flight. Elastic pitch-flap couplings (positive and negative) strongly affect body, rotor and dynamic inflow modes. ![]() Elastic couplings introduced through tailored composite blade spars can have a powerful effect on both air and ground resonance behavior. Five soft-inplane hingeless rotor configurations, featuring elastic pitch-lag, pitch-flap and extension-torsion couplings, are analyzed. The aeromechanical stability, including air resonance in hover, air resonance in forward flight, and ground resonance, of a helicopter with elastically tailored composite rotor blades is investigated.
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