AN IN-FLIGHT INVESTIGATION OF LATERAL-DIRECTIONAL DYNAMICS FOR CRUISING FLIGHT.
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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An in-flight investigation using a variable stability airplane has shown that some degree of spiral stability is desirable in cruising flight and that not all aspects of a stable spiral are necessarily good. The amount of spiral stability needed and the acceptability of the handling qualities are a function of roll damping, roll-to-sideslip ratio and aileron friction characteristics. A basic configuration representative of high altitude, high speed executive jet airplane in cruising flight was selected. The Dutch roll frequency and damping ratio and longitudinal handling qualities were held constant. Two values of roll mode time constant and roll-to-sideslip ratio were evaluated for a large variation in spiral characteristics. In addition, a subset of configurations was evaluated with aileron friction. The vehicle used was the variable stability T-33 airplane equipped with a wheel controller. Both VFR and IFR conditions were investigated. Author
- Transport Aircraft