Discussion
Compared with an incompressible calculation, treating air as compressible at Mach 0.7 gives a lift coefficient that is
Answer: C
The Prandtl-Glauert factor divides the incompressible coefficient by the square root of one minus the square of the Mach number, and that factor is less than one, so the compressible coefficient is the larger. Physically, compressibility exaggerates the pressure peaks over the surface.
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