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A canard-delta configuration is used on aircraft such as the Eurofighter partly because the canard

  • A.It sheds a vortex that energises the wing flow
  • B.Removes the need for a vertical fin
  • C.Increases the aspect ratio of the main wing
  • D.Eliminates wave drag at supersonic speed

Answer: A

The canard's own vortex passes over the wing and delays breakdown of the wing's leading-edge vortex, extending the usable incidence range. It also trims the aircraft with a lifting rather than a downloading surface, which suits a delta whose aerodynamic centre moves a long way between subsonic and supersonic flight.

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