Abstract
L performance has long been suggested to correlate with the backside parameter, \/Ty = — Xu + (Xw—g/U)Zu/Zw, which is a zero of the elevator to flight-path transfer function, and current flying qualities criteria require \/Ty — 0.02 s ~ ] for the desirable flight-path stability. Explanations concerning the physical meaning of this parameter (e.g., Refs. 2-5), however, have usually been qualitative, and this reduces the parameter's utility in quantitative discussions. For example, it has not yet been clear whether there are any differences in flying qualities between flights of a fighter and a jet transport when the respective backside parameters are the same. This paper provides an answer to this question, and shows theoretically that the parameter determines the lower bounds of the maximum achievable accuracy of the flight-path angle error due to vertical gusts, without regard to the type of airplane.
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