The critical Mach number for an aerofoil equals the free stream airfoil Mach number at which:

Question

Question ATPL - Airline Transport Pilot license - Principles of Flight

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Sonic speed (M=1) is reached at a certain point on the upper side of the aerofoil.

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The maximum operating temperature is reached.

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A shock-wave appears on the upper surface.

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A 'supersonic bell' appears on the upper surface.

Id 126 - ATPL - The critical Mach number for an aerofoil equals the free stream airfoil Mach number at which: