Forebody-mounted jet nozzles for yaw control on a generic fighter configuration with a chined forebody

A wind tunnel investigation was conducted in the NASA Langley 12-Foot Low-Speed wind tunnel to determine the yaw-control effectiveness of jet nozzle blowing on a chined forebody. The results indicated that jet nozzle blowing can be used on a chined forebody to generate yawing moment levels up to twice the value of maximum rudder control. In addition, this yawing moment increment was controllable at angles of attack up to and beyond maximum lift and at moderate sideslip angles. The nozzle pointing angle and forebody cross-section were shown to have a pronounced impact on the effectiveness of nozzle blowing. Although the effect on pitching moment was small, nozzle blowing on a chined forebody produced substantially large rolling moments in the region of maximum lift. The rolling moment was proverse, however, and could be used to coordinate wind-axis roll maneuvers at high angles of attack.