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The point where Drag coefficient/Lift coefficient is a minimum is...
  • A

    the point on the total drag curve where the parasite drag doubled induced drag

  • B
    at stalling speed VS
  • C

    the lowest point of the drag curve

  • D

    on the “back side” of the drag curve

Refer to figures.

DRAG/THRUST REQUIRED CURVE

  • Lowest Point of curve – VMD, Best L/D Ratio and best glide.
=> For JET: VX = Maximum Endurance Speed
=> For PROP: Maximum Range Speed.
  • Tangent – 1.32 VMD
=> For JET: Best Range Speed, VY

Note: MAX CL/CD = MIN CD/CL

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