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A tapered wing box differs from a prismatic one in shear analysis because

  • A.Inclined caps carry part of the shear
  • B.Shear flow cannot be defined in a tapered box
  • C.The enclosed area is irrelevant
  • D.The section becomes statically determinate

Answer: A

In a tapered box the spar caps are inclined to the axis, so their axial loads have transverse components that relieve part of the applied shear. Ignoring the taper overstates the shear the webs must carry, sometimes appreciably near the root.

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