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Load introduction at the wing-fuselage joint is difficult because

  • A.No load passes through the joint
  • B.Large loads must diffuse into a thin shell
  • C.The loads there are unusually small
  • D.The structure is unstressed at that point

Answer: B

The wing delivers its full root bending moment and shear through a handful of fittings, and that concentrated load has to spread into skins a millimetre or two thick. Heavy frames, machined fittings and generous doublers are the usual answer.

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