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A shear web in a spar carries

  • A.The torsion of the wing box
  • B.The fuel pressure alone
  • C.The vertical shear force
  • D.The bending moment of the wing

Answer: C

The web takes the shear that the caps cannot, and in a thin web the load is carried after buckling as a field of diagonal tension rather than in pure shear. Designing deliberately for that post-buckled state saves a great deal of weight.

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