Aerodynamic center

The point along the chord of an airfoil where all changes in lift effectively take place. The aerodynamic center is not affected by the camber, the thickness of the airfoil, nor the angle of attack. For a subsonic airfoil, the aerodynamic center is located between 23% and 27% of the chord length back from the leading edge, and for a supersonic airfoil it is located 50% of the chord length back from the leading edge.