Discussion
Assertion (A): The Prandtl-Glauert rule may be used up to a wing's drag-divergence Mach number.
Reason (R): The rule is a linearisation valid only for wholly subsonic flow.
Select the correct answer from the options below.
Answer: C
The assertion is false and the reason is true. The rule fails as soon as a supersonic pocket appears, which happens at the critical Mach number, and that lies below the drag-divergence value. Using it in the band between the two is a common and material error.
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