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Stall Fence

  • There may be other structures visible on the wings of an aircraft that contribute to performance. Winglets, vortex generators, stall fences, and gap seals are all common wing features. Introductory descriptions of each are given in the following paragraphs.
  •  A chordwise barrier on the upper surface of the wing, called a stall fence, is used to halt the spanwise flow of air. During low-speed flight, this can maintain proper chordwise airflow reducing the tendency for the wing to stall.
  •   Usually made of aluminum, the fence is a fixed structure most common on swept wings, which have a natural spanwise tending boundary airflow.
  •  Often, a gap can exist between the stationary trailing edge of a wing or stabilizer and the movable control surface(s).
  • At high angles of attack, high-pressure air from the lower wing of the surface can be disrupted at this gap.
  •  The result can be turbulent airflow, which increases drag. There is also a tendency for some lower wing boundary air to enter the gap and disrupt the upper wing surface airflow, which in turn reduces lift and control surface responsiveness.
  •  The use of gap seals is common to promote smooth airflow in these gap areas. Gap seals can be made of a wide variety of materials ranging from aluminum and impregnated fabric to foam and plastic.

 

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