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Increasing Reynolds number generally has which effect on the maximum lift coefficient of a section?

  • A.It falls to zero above a critical value
  • B.It increases, because the boundary layer resists separation better
  • C.It decreases, because skin friction grows
  • D.It is unchanged, since Reynolds number affects only drag

Answer: B

A higher Reynolds number gives a fuller, more energetic boundary layer that runs further against the adverse gradient before separating, so the section reaches a higher angle and a higher maximum coefficient. This is one reason model results understate full-scale performance.

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