And Relationship
The coefficient of lift for an airfoil with strictly horizontal surfaces can be calculated from the coefficient of pressure distribution by integration, or calculating the area between the lines on the distribution. This expression is not suitable for direct numeric integration using the panel method of lift approximation, as it does not take into account the direction of pressure-induced lift.
where:
- is pressure coefficient on the lower surface
- is pressure coefficient on the upper surface
- is the leading edge
- is the trailing edge
When the lower surface is higher (more negative) on the distribution it counts as a negative area as this will be producing down force rather than lift.
Read more about this topic: Pressure Coefficient
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