A Flight evaluation of a vectored-thrust-jet V/STOL airplane during simulated instrument approaches using the Kestrel (XV-6A) airplane
National Aeronautics and Space Administration, 1972 - Transportation - 76 pages
An in-flight investigation was made to determine the terminal-area operating problems of a vectored-thrust-jet vertical and short take-off landing (V/STOL) airplane under simulated instrument conditions. Handling-qualities data pertinent to the terminal-area approach and landing task are presented in the text, and additional documentation is included in the appendixes. Problems dealing with the cruise letdown to localizer capture, conversion to powered-lift flight, precise control of the glide slope, approach velocity or deceleration schedule, hover, and landing are discussed.
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65 knots 65-knot approaches aerodynamic aileron aircraft AIRPLANE DURING SIMULATED angle of attack angle-of-attack approach speed approximately breakout compressor stalls constant conversion to powered-lift damping ratio decelerating approach decelerating to 65 Dutch roll engine fan speed final approach velocity fuel gear and flaps glide glide-slope and localizer glide-slope angle glide-slope control glide-slope intercept handling qualities Hot-gas reingestion increased Indicated airspeed inlet temperature instrument flight instrument landing system KESTREL XV-6A Langley Research Center Lateral control lateral-directional lift coefficient longitudinal stability maneuvers nozzle angle nozzle-angle modulation percent pilot workload pitch attitude pitch control pitch divergence powered lift powered-lift flight precision-heading changes presented in figure rad/sec2 rate of descent Rudder position short take-off Sideslip angle slope static steady sideslip STOL tailplane angle technique terminal area Terminal-area operation throttle thrust level thrust modulation touchdown point tracking Trailing edge full turbopropeller turn coordination V/STOL AIRPLANE vertical VTOL wingborne flight