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A mission needs a fuel fraction of \( 0.32 \) but the design closes only at \( 0.26 \). The design

  • A.Cannot meet the range as assumed
  • B.Has excess range capability
  • C.Is optimally sized
  • D.Needs a larger payload

Answer: A

The fuel the mission demands exceeds what the weight budget allows, so something must change: the range requirement, the aerodynamic efficiency assumed, or the payload. This is exactly the situation a diverging sizing loop signals.

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