A METHOD FOR THE DETERMINATION OF THE DAMPING-IN-PITCH OF SEMI-SPAN MODELS IN HIGH-SPEED WIND-TUNNELS, AND SOME RESULTS FOR A TRIANGULAR WING

摘要

A method has been developed for the determination of the damping-in-pitch of semi-span models in high-speed wind-tunnels using free oscillation technique. The model is mounted elastically by means of a torsion bar with cruciform section. The initial oscillation amplitude is built up electromagnetically after which the disconnection of the energy source results in a free oscillation, which is automatically evaluated on a special electronic apparatus, called the "Dampometer".