Abstract
Tests were conducted on a specially designed slender delta wing with a 75 deg leading edge sweep and capable of rotational degrees of freedom about longitudinal and vertical axis. Aerodynamic measurements were made for three cases when the model motion was limited to roll only, yaw only and combined roll and yaw. Results were compared to the data for fully constrained case. Roll and yaw oscillations were observed to start near 28o angle of attack however the amplitude of oscillations for the roll decreased from ±30 o to ±18 o and that of yaw decreased from ±20 o to ±5 o when the model was allowed to simultaneously roll and yaw indicating unique fluid dynamic coupling. The frequency of yaw oscillations was found to be 1/3 the frequency of roll oscillations indicating stronger dependence of roll on vortex bursting.
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