The coefficient of pitching (Cm) of an airfoil measures the rotational force it experiences when changing its angle of attack in a fluid, typically air. It’s dimensionless and quantifies this moment relative to dynamic pressure and reference area. This parameter is crucial for analyzing the stability and control of aircraft and other aerodynamic structures. A positive Cm indicates a nose-up pitching moment, while a negative value suggests a nose-down pitching moment. The formula to calculate Coefficient of Pitching Moment of an airfoil as follows:
Where:
- M is the Pitching Moment in Nm,
- b is the span in m
- q∞ is the Dynamic pressure in Pa,
- C is the mean chord length in m.