Validity of axis transfer technique for pitch damping measurements AIAA-78-833

Results of some experimental investigations undertaken to verify the validity pitch damping measurements on high fineness ratio configurations are presented. Free oscillation tests on three half models of fineness rations 10 and 25 were conducted at Mech numbers between 0.7 and 1.2 with three different axes of oscillation. The measured pitch damping derivatives for two axes user used to compute the derivative for the third axis. Comparison between the transferred and the measured derivatives was in general, good for Mach numbers 1.1 and 1.