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Sweeping a wing back carries which of the following penalties?

  • A.A forward shift of the aerodynamic centre
  • B.Tip stall and reduced maximum lift
  • C.A large increase in skin-friction drag
  • D.An inability to use trailing-edge flaps at all

Answer: B

Sweep drives the boundary layer outboard along the span, thickening it near the tip and encouraging the tip to stall first, which costs both maximum lift and roll control. Swept wings therefore need washout, fences, vortilons or leading-edge devices to restore acceptable stalling behaviour.

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