TARE AND INTERFERENCE CORRECTIONS OF OFFSET MOUNTING INCLUDING THE INFLUENCE OF MODEL INTERFERENCE ON THE OFFSET FITTING IN LOW SPEED WIND TUNNELS

摘要

The influence of the offset on the basic aerodynamic loads of the aircraft model was measured in low speed wind tunnel using shadow analogy. A simple floor mounted sting with provision for changing alphas was fabricated, and the model under test was mounted in inverted position. The sting with offset was also mounted in the reverse direction and the forces on the offset in the presence of the model were measured at all attitudes. The effect of model influence on the offset fitting was found to be substantial.