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The two axes of a conventional constraint diagram are

  • A.Wing loading and thrust-to-weight
  • B.Wing area and installed thrust
  • C.Aspect ratio and sweep
  • D.Range and payload

Answer: A

Plotting the constraints in these non-dimensional terms makes them independent of aircraft size, so the same diagram serves at any weight. Multiplying back by the design weight then gives the wing area and the thrust required.

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