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The practical lesson of this topic for a designer is that

  • A.Weight can be assessed once at the end of the design
  • B.Weight matters less than aerodynamic efficiency
  • C.Weight estimation is purely a statistical exercise
  • D.Weight must be tracked and traded openly

Answer: D

Each of the four activities addresses a different failure mode, from a bad initial estimate to unnoticed growth to a trade made on incomparable quantities. Omitting any one of them reliably produces an aircraft heavier than intended.

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