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A derivative aircraft differs from a clean-sheet design in that it

  • A.It reuses much of an existing design
  • B.Is always heavier than a new design
  • C.Requires no certification activity
  • D.Cannot carry more payload than its parent

Answer: A

Stretching a fuselage or re-engining an airframe reaches a market far more cheaply than starting again. The penalty is that the original design point constrains the result, and successive derivatives drift further from optimal.

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