Measurements of the aerodynamic derivatives for swept wings of low aspect ration describing pitching and plunging oscillations in incompressible flow

Abstract

The aerodynamic lift and moment derivatives for pitching oscillations in incompressible flow have been measured for two axis positions on (i) a clipped delta wing of aspect ratio 1.2, (ii) a complete delta wing of aspect ratio 1.6, and (iii) an arrowhead wing of aspect ratio 1.32. The results for the arrowhead wing and the dipped delta wing are compared with values predicted by the vortex-lattice and the Multhopp-Garner methods of calculation. The results for the complete delta wing are compared with values calculated by Garner and by Lawrence and Gerber. In each of the comparisons a satisfactory measure of agreement was found between the theoretical and experimental values of the derivatives. Calculated values for the clipped delta wing based on very low aspect ratio theory did not accord with those found by experiment.