DOUBLE-DELTA-WING AERODYNAMICS FOR PITCHING MOTIONS WITH AND WITHOUT SIDESLIP

Subsonic aerodynamic experiments, both with and without sideslip, were performed on a strake/wing planform for both static and dynamic condi tions. The strake sweep, wing sweep, and strake-to-wing fineness ratio for the model was 80 deg/60 deg/0.6. Flow visualization information w as obtained by marking the strake and wing vortices with smoke in orde r to determine the state of the vortices (i.e., existence, pre- or pos tbreakdown). Five-component force and moment data was also taken. Both the flow visualization and the force and moment information were obta ined for the model at static angles of attack, as well as for the mode l undergoing sinusoidal pitching motions. The minimum and maximum angl es of attack of the motions were varied. Also varied were the reduced frequencies of the motions. The combined information obtained from the now visualization and force experiments was used to explain some of t he dynamic effects observed for the double delta wing.