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Induced drag as a fraction of total drag is largest

  • A.At high speed in cruise
  • B.In a high-speed dive
  • C.At the maximum operating Mach number
  • D.At low speed and high lift coefficient, such as during take-off climb

Answer: D

Induced drag varies with the square of the lift coefficient, and the lift coefficient is largest when the aircraft is heavy and slow. During the take-off climb it can exceed all other drag sources combined. In high-speed cruise the lift coefficient is small and profile and wave drag dominate instead.

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