THE LIGHT-LINE-TETHERING TECHNIQUE FOR DETERMINING THE AERODYNAMIC DERIVATIVES OF AN AIR CUSHION VEHICLE.
Final rept., Oct 60-May 65,
TORONTO UNIV (ONTARIO)
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A complete feasibility study was performed on a new technique for determining ACV aerodynamic derivatives. A circular track simulated ground while the vehicle, tethered to a centerpost by means of a light cable, flew a circular flight path above the track surface. A step on the ground perturbed the vehicle from equilibrium and the resulting oscillations were recorded by a movie camera. The results obtained indicated that many derivatives were functions of height. Although scatter in the data permitted a qualitative study only, it was concluded that the scatter resulted from random errors in the recorded time histories and the manner in which the cable was attached to the vehicle. By making certain improvements in the experimental design and apparatus especially using a larger track it was concluded that all derivatives could be obtained with satisfactory precision with this technique. Author