LATERAL AERODYNAMIC PARAMETERS EXTRACTED FROM FLIGHT DATA FOR THE F-8C AIRPLANE IN MANEUVERING FLIGHT

摘要

Flight-test data have been used to extract the lateral aerodynamic parameters of the F-8C airplane at moderate to high angles of attack. The data were obtained during perturba¬tions of the airplane from steady turns with trim normal accelerations from 1.5g to 3.0g. The angle-of-attack variation from trim was negligible.nAlthough wind-tunnel data indicate that the rolling and yawing moments are somewhat nonlinear with angle of attack, the angle-of-attack variations are small; therefore, the linear aerodynamic coefficients extracted from the flight tests permit computation of motion time histories which are in close agreement with the measured time histories. The aerodynamic coefficients extracted from flight data were compared with several other sets of coefficients, and the extracted coefficients resulted in characteristics for the Dutch roll mode (at the high¬est angles of attack) similar to those of a set of coefficients that has been the basis of several simulations of the F-8C.