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Wing ribs are spaced more closely near the wing root chiefly because

  • A.The loads and skin stresses are highest there
  • B.The aerofoil section changes most rapidly there
  • C.Fuel is stored only near the root
  • D.The wing is thinnest there

Answer: A

Bending moment and shear both peak at the root, so the skin panels there carry the highest compressive stress and need the shortest unsupported length to avoid buckling. Rib pitch is therefore a direct response to the local stress rather than to geometry.

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