A Method Utilizing Data on the Spiral, Roll-Subsidence, and Dutch Roll Modes for Determining Lateral Stability Derivatives From Flight Measurements ; NACA Technical Notes

Note presenting a method for determining lateral stability derivatives from flight measurements, which is obtained by arranging the lateral equations of motion in such form that information from each of the three modes of lateral motion may be utilized. The method permits determination of all the important derivatives without requiring an estimation of any of the derivatives. Results regarding the probable errors in measurements, errors in derivatives, effect of side-force rate derivatives, and some improvements in the method are provided.