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The design lift coefficient of an aerofoil is the value at which

  • A.The section stalls
  • B.The section produces zero lift
  • C.The section reaches its maximum thickness
  • D.The middle of its low-drag range

Answer: D

Choosing a section whose design lift coefficient matches the cruise value keeps the aircraft in the drag bucket where it spends most of its life. A mismatch means cruising on the shoulder of the polar and paying for it every hour.

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