Discussion
A student computes a lift coefficient at Mach 0.98 using the Prandtl-Glauert rule and obtains a value five times the incompressible one. The result should be treated as
Answer: D
The Prandtl-Glauert factor tends to zero as Mach one is approached, so the predicted coefficient grows without limit. That is a failure of the linearisation, not a physical prediction. The rule may be used only below the critical Mach number, well short of 0.98.
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