A Helicopter Flight Investigation of Roll-Control Sensitivity, Damping, and Cross-Coupling in a Low-Altitude Lateral Maneuvering Task.
NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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A helicopter in-flight simulation was conducted to determine the effects of variations in roll damping, roll sensitivity, and pitch- and roll-rate cross-coupling on helicopter flying qualities in a low-altitude maneuver. The experiment utilized the Ames UH-1H helicopter in-flight simulator, which is equipped with the VSTOLAND avionics system. The response envelope of this vehicle allowed simulation of configurations with low-to-moderate damping and sensitivity. A visual, low-level slalom course was set up, consisting of constant-speed and constant-altitude S-turns around the 1000-ft markers of an 8000-ft runway. Results are shown in terms of Cooper-Harper pilot ratings, pilot commentary, and statistical and frequency analyses of the lateral characteristics. These results show good consistency with previous ground-simulator results and are compared with existing flying-qualities criteria, such as those set forth in MIL-F-83300 and MIL-H-8501A. Author
- Flight Control and Instrumentation