The moment coefficient about the quarter-chord (often denoted as “cm,c/4”) for a cambered airfoil refers to the aerodynamic moment or torque exerted around the airfoil’s quarter-chord point. This coefficient provides valuable information about the airfoil’s pitching behavior, stability, and balance. In the context of an airfoil, the quarter-chord point is located at 25% of the chord length from the leading edge. This point is commonly used as a reference location for aerodynamic calculations and analyses.
- cm,c/4: Moment coefficient about the quarter-chord
- A1: Area under the upper surface of the airfoil
- A2: Area under the lower surface of the airfoil