A METHOD FOR ESTIMATING VARIATIONS IN THE ROOTS OF THE LATERAL-STABILITY QUARTIC DUE TO CHANGES IN MASS AND AERODYNAMIC PARAMETERS OF AN AIRPLANE

摘要

A method is presented for estimating variations in the roots of the lateral-stability quartic due to changes in mass and aerodynamic parameters of an airplane. The method is applied to three high-speed airplanes and the changes of their lateral stability characteristics are determined by considering increments in various airplane parameters.nThe expressions indicating the rate of change of the Dutch roll damping arid frequency with respect to the stability derivatives and mass characteristics are simplified and the results when compared with those obtained from the exact expressions show very good agreement.