In aerodynamics, the normal force coefficient () is a dimensionless parameter used to describe the lift or downforce generated by an object, such as an airfoil, wing, or any other body moving through a fluid, typically air. The normal force refers to the force that is perpendicular to the freestream flow direction.
- is the normal force coefficient,
- is the normal force acting on the object (the force perpendicular to the freestream flow direction),
- is the dynamic pressure of the freestream flow (far from the object),
- is the reference area of the object.