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  • is defined  as small airfoil vanes or curved plates attached to the underside of the wing near its leading edge, it’s aligned with the flight direction. When the speed is reduced and the aircraft approaches stall, and  the local flow at the leading edge is diverted outwards, this spanwise component of velocity around the vortilon creates a vortex streamed around the top surface, which energies the boundary layer. A more turbulent boundary layer, in turn, delays the local flow separation.
  • Vortilons are mounted on the underside of each wing tip leading edge. Vortilons (an abbreviation of two words: vortex and pylon) help to improve aileron performance at high angles of attack and thus improve the controllability of the airplane in a stall and reduce the risk of a spin.
  • When the wing approaches a stall, span-wise flow starts to flow across the Vortilons which start to generate a vortex. Vortex creates a turbulent flow in the boundary layer which delays flow separation.
  • The occurrence of span-wise flow at high angles of attack, such as observed on swept wings, is an essential requirement for vortilons to become effective.

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