Active Arm (External Cargo) Stabilization System Flight Demonstration.
FINAL REPT. Jul 74-Apr 76,
BOEING VERTOL CO PHILADELPHIA PA
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Development of an advanced Active Arm External Load Stabilization System AAELSS II for helicopters has been accomplished through analysis, ground test, and flight evaluation of the concept on a CH-47C aircraft. Hydraulically powered arms mounted beneath the helicopter automatically control load motion to provide pendular damping levels in excess of 25 of critical. The system completely eliminates longitudinal pilot-induced oscillation PIO tendencies, permitting full envelope instrument meterological conditions IMC flight with heavy external payloads. Potential for precision hover load placement and flight with unstable loads exists. The design is also capable of operating with winchable HLH cargo hoist cable systems. Author