Flying quality factors currently limiting helicopter nap-of-the-earth maneuverability as identified by flight investigation
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adverse yaw Airfoil angular response characteristics angular-velocity damping autorotative bank angle basically different rotor Blade area Blade chord Blade taper ratio characteristics of helicopter cockpit collective control collective pitch collective stick control coordination control sensitivity copter course with 400-foot different rotor systems Disk area Engine output shaft Figure FLIGHT INVESTIGATION flying qualities Full forward 50 Full rearward 50 fuselage G G G G O G g unit governing systems height-control heli histories hit-the-deck hovering flight initial angular response Je|n6ue Langley Research Center lateral stick lift coefficient longitudinal stick main-rotor maneuver tasks maneuverability marker spacing Moments of inertia nap-of-the-earth NASA TN normal acceleration Normal operating speed Number of blades overall performing maneuvers rad/sec roll axis roll response roll-control power rolling velocity rotational speed S-turn sideslip angles slalom course slalom task slug-ft2 kg-m2 stick movement swashplate Tail rotor teardrop turn test helicopters trim uoujsod V/STOL vertical acceleration weight