Moment coefficient about aerodynamic center Calculator

The moment coefficient about the aerodynamic center (often denoted as “cm,ac”) is a fundamental parameter in aerodynamics and aircraft design. It quantifies the aerodynamic moment or torque exerted on an airfoil or wing due to changes in the angle of attack. In more technical terms, the moment coefficient about the aerodynamic center relates the pitching moment (the rotational force) experienced by an aircraft to the aerodynamic forces acting on it, particularly changes in lift and drag forces as the angle of attack changes. The aerodynamic center is a specific point on an airfoil or wing where this moment remains relatively constant over a range of angle of attack variations. This property is crucial for understanding and predicting the stability and control behavior of an aircraft. 

• cm,ac: Moment coefficient about the aerodynamic center
• Cl: Lift coefficient of the airfoil
• x̄ac: Nondimensional distance from the leading edge to the aerodynamic center
• 0.25: Quarter-chord position along the chord
• cm,c/4: Moment coefficient about the quarter-chord point