Abstract
Analytical and flight simulator studies were conducted to examine the effects on selection of optimum longitudinal control sensitivity of 1) the oscillatory mode dynamics, 2) the stability derivatives Mq/Iy, XM/m, and Mug/Iy, and 3) the level of turbulence. An improved method for presenting handling qualities criteria was developed which permits construction of the optimum longitudinal control sensitivity line on a plot of pitch rate damping vs longitudinal control sensitivity (i.e., Tapscott's form of presentation) for any aircraft for which Xu/m and Mug/Iy are known or can be estimated. In this method a constant slope is assumed for the optimum line; for each of three reference levels of turbulence, contours of constant intercept with the zero-damping axis are presented on the Xu/m vs Mug/Iy plane, and contours of constant Cooper pilot rating are presented on the Mq/Iy vs Mug/Iy plane for three values of Xu/m. Predictions of the optimum longitudinal control sensitivity line made using contours established in the United Aircraft Corporation (UAC) flight simulator are in good agreement with published flight-test data for the NASA X-14A VTOL research airplane and the Princeton HUP-1 variable stability helicopter.
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