Non-dimensional coefficients used to quantify aerodynamic forces and moments are known as?

• A. Aerodynamic Coefficients
• B. Drag Coefficients
• C. Lift Coefficients
• D. Dynamic Coefficients

Answer: (A)

Non-dimensional coefficients used to quantify aerodynamic forces and moments are called aerodynamic coefficients. They express lift, drag, and pitching (and other) moments in a common, scale-free form by relating the forces or moments to dynamic pressure and a reference area (and length for moments). This allows meaningful comparisons across different aircraft sizes and speeds. For example, the lift coefficient, drag coefficient, and moment coefficient are all part of this broader category. Specific terms like drag coefficients or lift coefficients describe only one component of the overall aerodynamic forces, so they don’t encompass the full set. The phrase dynamic coefficients isn’t a standard way to name this whole family of dimensionless quantities.