The moment coefficient about the leading edge for a symmetric airfoil is often denoted as “cm,le.” This coefficient represents the aerodynamic moment or torque exerted around the airfoil’s leading edge. cm,le is typically calculated or measured about a specific point on the airfoil, often the quarter-chord point (25% of the chord length from the leading edge), and it provides information about the airfoil’s pitching behavior or its tendency to rotate around its center of pressure.Â
- cm,le: Moment coefficient about the leading edge
- cl: Lift coefficient of the airfoil
- A1: Area under the upper surface of the airfoil
- A2: Area under the lower surface of the airfoil