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Interference drag arises where

  • A.Two components meet and their flow fields interact
  • B.A single isolated body moves through still air
  • C.The flow is entirely laminar
  • D.The Reynolds number is very low

Answer: A

At a junction such as a wing root or a strut fitting, the two boundary layers merge in a corner where the pressure is already recovering, and separation follows readily. Fillets exist to ease that corner, and the drag they save can be a surprisingly large share of the total.

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