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Discussion

Taken together, the corrections and calibrations described in this topic exist because

  • A.Models are always built inaccurately
  • B.Balances cannot measure forces reliably
  • C.Air behaves differently indoors
  • D.A tunnel measures the model plus the tunnel

Answer: D

Every reading contains the influence of walls, supports, stream misalignment and the tunnel's own turbulence alongside the aerodynamics of the shape. The whole apparatus of corrections is there to separate the two, so that what is reported is the model's behaviour in free air.

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