The effect and processing method for the lateral flexible angle in the angle of attack and roll coupled wind tunnel test

Changing the model attitude with the coupled angle of attack and roll is an important mode for the lateral test. Although the lateral flexible angle is offered in this kind of test, the data of lateral flexible angle is often neglected, which leads to the inaccuracy of the relation between the aerodynamic loads and the model attitude. Lateral flexible angle is generated from the lateral force and the yawing moment, and the effect of the lateral flexible angle will be notable when the values of the lateral force and the yawing moment are large in the test, for example, the yaw steerage test. The effect of the lateral flexible angle is analyzed, offers a data processing method of the lateral flexible angle. Calculative and experimental results show that the method can increase the accuracy of the application data.