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An integrally machined skin-stringer panel is produced by

  • A.Bonding a honeycomb core between two skins
  • B.Weaving carbon fibre into a stiffened preform
  • C.Machining the stringers from thick plate
  • D.Riveting extruded stringers to a separate skin

Answer: C

Cutting the stiffeners from solid removes every fastener hole and the fatigue origins that go with them, and gives a clean aerodynamic surface. The penalties are the material machined away and the difficulty of repair, since a damaged stringer cannot simply be unbolted.

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