Aeromodelling

Aerodynamic Center (AC) is an imaginary point on the aircraft wing. When the aircraft wing move through the air, the position of the aerodynamic center remain at the same point regardless of change in angle of attack.

Aerodynamic center is located around 25% of the chord from the leading edge for low speed airfoils. For subsonic flow, it located approximately 50% chord from the leading edge of an aerofoil.

This concept of the aerodynamic centre is useful to designers, because lift force assume located at a fixed point and only among of lift force changes with angle of attack vary.