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If a sizing loop diverges, the most likely explanation is that

  • A.The arithmetic is wrong
  • B.The wing is too small
  • C.The engine is too heavy
  • D.The mission exceeds the assumed technology

Answer: D

Divergence means each added kilogramme of fuel adds more than a kilogramme of weight, which happens when the mission is beyond what the assumed efficiency can deliver. Either the requirement or the technology assumption has to give.

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