Abstract
Wind-tunnel test results of a BWB-UCAV model which was modified slightly from UCAV 1303 at a free stream speed of 50m/s at various angles of attack and yaw angles are presented in the present paper. The six-component force and moment coefficients were measured by using internal balance. Well known pitch-break phenomenon was identified to occur at a rather low angle of attack. Yawing and rolling moment coefficients from the measurements data also were found to exhibit very irregular pitch-break type behavior at non-zero yaw angles. To elucidate some aerodynamic flow structures, surface oil flow visualization and PSP measurements were also carried out.
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