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Which single factor most limits how directly wind-tunnel results transfer to full scale?

  • A.The type of balance fitted
  • B.The Reynolds number mismatch
  • C.The colour of the model
  • D.The length of the test section

Answer: B

Almost every other difficulty can be corrected or calibrated away, but the Reynolds number gap changes the physics of the boundary layer itself, moving transition and separation. Trip strips, pressurisation and cryogenic operation are all attempts to close that one gap.

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