In aerodynamics, “xac” typically refers to the location of the aerodynamic center of an airfoil or wing. The aerodynamic center is a point on the airfoil or wing where changes in lift and pitching moment (related to changes in angle of attack) occur without inducing changes in drag. It is an important concept in aerodynamic stability and control. The aerodynamic center is a crucial parameter for understanding the behavior of an aircraft or other aerodynamic body. When an aircraft undergoes changes in pitch (rotation around its lateral axis), the aerodynamic center plays a key role in determining the aircraft’s stability characteristics.
- x̄ac is the the location of the aerodynamic center of an airfoil or wing
- m0 is the slope of moment coefficient curve in per radÂ
- a0 is the slope of lift coefficient curve in per rad