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# aerodynamic center

The aerodynamic center is a point on the wing chord that results in a constant moment when the wing angle of attack is changed. An AC lies approximately at the quarter-chord position at subsonic speeds and at approximately the half-chord position at supersonic speeds.
Moment about the aerodynamic center is constant with angle of attack. Aerodynamic center does not move with angle of attack.

Aviation dictionary. 2014.

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