#flaps__flap__flap  a movable airfoil that is part of an aircraft wing; used to increase lift or drag
  supertype:  #airfoil__control_surface__surface  a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
  part of:  #wing.airfoil
  subtype:  #landing_flap__landingflap  a flap on the underside of the wing that is lowered to slow the plane for landing

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