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The main purpose of high-lift devices is to

  • A.Reduce the speed at which the aircraft can fly safely
  • B.Increase the maximum cruising speed of the aircraft
  • C.Reduce the drag of the aircraft in the cruise
  • D.Move the aerodynamic centre towards the tail

Answer: A

By raising the maximum lift coefficient they lower the stall speed, so approach and take-off can be flown more slowly and the runway required is shorter. They add considerable drag, which is why they are retracted in cruise.

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