AN INVESTIGATION OF A CLOSE-COUPLED CANARD AS A DIRECT SIDE-FORCE GENERATOR ON A FIGHTER MODEL AT MACH NUMBERS FROM 0.40 TO 0.90

摘要

An investigation of the ability of a close-coupled canard positioned above the wing plane to act as-a direct side-force generator on a fighter model has been conducted in the Langley l6-foot transonic tunnel at 0° angle of sideslip. The canard panels had 5° of dihedral and were deflected differentially or indi¬vidually over an incidence range from 10° to -10° and a model angle-of-attack range from -4° to 15° . Mach number was varied from 0.40 to 0.90.nSignificant side forces were generated by differential and single canard-panel deflections over the Mach number and angle-of-attack ranges. The yawing moment resulting from the forward location of the generated side force would necessitate a vertical tail/rudder trim force which would augment the forebody side force and be of comparable magnitude. Incremental side forces, yawing moments, lift, and pitching moments due to single canard-panel deflections were additive;that is, their sums were essentially the same as the forces and moments produced by differential canard-panel deflections of the same magnitude. Differ¬ential and single canard-panel deflections produced negligible rolling moments over the Mach number and angle-of-attack ranges.