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The design speed VD in the flight envelope represents the

  • A.Speed for best range
  • B.Speed for maximum rate of climb
  • C.Design dive speed
  • D.Stalling speed in level flight

Answer: C

VD is the design dive speed, reached in an upset or an emergency descent, and it sets the right-hand boundary of the envelope. VC, the design cruising speed, sits below it with a margin chosen so that an inadvertent overspeed does not immediately exceed the design condition.

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