Comparison of X-31 flight and ground-based yawing moment asymmetries at high angles of attack / Brent R. Cobleigh, Mark A. Croom Cobleigh, Brent R

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Cobleigh, Brent R
Asymmetry.; Yawing (Aerodynamics); Wind tunnel tests.
Significant yawing moment asymmetries were encountered during the high-angle of attack envelope expansion of the two X-31 aircraft. These asymmetries caused position saturations of the thrust-vectoring vanes and trailing-edge flaps during some stability-axis rolling maneuvers at high angles of attack. The two test aircraft had different asymmetry characteristics, and ship 2 has asymmetries that vary as a function of Reynolds number. Several aerodynamic modifications have been made to the X-31 forebody with the goal of minimizing the asymmetry. These modifications include adding transition strips on the forebody and noseboom, using two different lenght strakes, and increasingh nose bluntness. Ultimately, a combination of forebody strakes, nose blunting, and noseboom transition strips reduced the yawing moment asymmetry enough to fully expand the high-angle-of-attack envelope.
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