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A wing is tested at one tenth full scale at the same speed. Its Reynolds number is

  • A.One hundredth of the full-scale value
  • B.One tenth of the full-scale value
  • C.Ten times the full-scale value
  • D.The same as the full-scale value

Answer: B

Reynolds number is proportional to the characteristic length at a fixed speed and fluid, so the model runs an order of magnitude low. Transition sits proportionally further back on the model, so the measured drag and stall behaviour will not represent full scale without correction or a trip strip.

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