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Taken together, the activities in this topic exist to demonstrate that

  • A.The aircraft meets its range requirement
  • B.The wing produces enough lift
  • C.The structure is the lightest achievable
  • D.Every member has a positive margin

Answer: D

Correct answer: Every member has a positive margin

That is the whole object of structural substantiation. Idealisation, section properties, stress calculation, failure criteria, joint and fitting checks, allowable selection and static testing all serve one conclusion: no member is overloaded in any design case. Range, lift and minimum weight are demonstrated by other disciplines and by other means entirely.

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