Question: For a thin wing moving parallel to its chord line, transition to a turbulent boundary layer occurs at a local Reynolds number Rex, where x

For a thin wing moving parallel to its chord line, transition to a turbulent boundary layer occurs at a “local” Reynolds number Rex, where x is the distance from the leading edge of the wing. The critical Reynolds number depends upon the intensity of turbulent fluctuations in the stream and equals 2.8E6 if the stream is very quiet. A semi empirical correlation for this case [Ref. 3 of Ch. 6] is

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