YHC-1A FLIGHT EVALUATION
AIR FORCE TEST CENTER EDWARDS AFB CA
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This report presents the results of the AFFTC flight evaluation of the YHC-1A helicopter. The YHC-1A is a twin turbine, tandem rotor, tactical transport helicopter powered by two General Electric T58-GE-6 free turbine engines. It represents an advance in the art of helicopter design due to its excellent handling characteristics, positive dynamic stability, and low vibration levels at high speed. The major undesirable system SAS for adequate stability and control, inability to utilize full engine power due to transmission torque limits, excessive rpm droop during power application which can lead to the loss of generator output and a dual SAS failure, and slow beep trim rate. It should be pointed out that many of the problem areas existing in the YHC-1A may be eliminated by already programmed design changes for the Vertol 107 Model II which is now in production.