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The exchange rate between weight and drag in a design trade expresses

  • A.The aircraft's specific fuel consumption
  • B.Drag counts worth one kilogramme
  • C.The cost of fuel per kilogramme
  • D.The ratio of lift to drag

Answer: B

A designer needs to know whether a fairing that saves drag is worth its own mass, and the exchange rate settles it quantitatively. The figure is derived from the mission and differs between a short-range and a long-range aircraft.

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