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0.l sec aerodynamic aft cabin station airplane Ames Research Center appendix center of percussion complex conjugate control cost da(s defined denominator du(s elevator control en(s equa equation 32a equation 33 equation Bl8 equation C28a equation C9 equations l6a Fa(s feed-forward loop closed filter gain finite flap actuating system flap and elevator flap control flap system Frequency domain Ga(s given gu(s gust alleviation system hence Juf/e l/sec lead time Tg light wing-loading STOL limiting performance linear longitudinal force derivative m/sec NASA NASA TN nondimensional obtained open loop optimal filter optimal trade-off output variable parameter partial fraction expansion phugoid pitching moment derivative power spectrum rational polynomial relative wind sensor required costs RH s-plane RH zero ride quality single controller solution v(s stability derivative strictly proper suboptimal filter system response System transfer function tion turbulence unknown coefficients WIENER-HOPF EQUATION wing-loading STOL aircraft zeroes of det[A(s