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The trailing vortices behind an aircraft rotate in which sense when viewed from behind?

  • A.Inward over the top, that is, the two vortices turn towards each other above the wake
  • B.Outward over the top, turning away from each other above the wake
  • C.Both clockwise, regardless of which tip they leave
  • D.In alternating directions that reverse periodically

Answer: A

Flow spills from the high-pressure lower surface round each tip to the low-pressure upper surface. Seen from behind, that gives a pair of counter-rotating vortices whose upper portions move inboard towards the centreline. The consequence is downwash between the vortices and upwash outboard of them.

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