Airworthiness and Flight Characteristics Evaluation. YAH-1S Improved Cobra Agility and Maneuverability Helicopter
Final rept. 17 Mar-17 Apr 1975
ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA
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Limited flight tests of a prototype aircraft were conducted at 3 test facilities at various altitudes. Testing concentrated on hover and level flight performance, controllability, and low-speed flight characteristics at heavy gross weight, high density altitude test conditions. The YAH-1S represents a significant improvement over the AH-1GQ helicopter by virtue of its increased useful load-carrying capability, directional controllability and control margin, and hover performance capability. The control system characteristics of the YAH- 1S failed to meet several requirements of applicable paragraphs of military specification MIL-H-8501A and the approved BHC deviations to MIL-H-8501A against which they were tested, but were still considered satisfactory. One shortcoming was noted.