Winglet A small vertical surface at the tips of the wings. They help direct the turbulent airflow that all wings have at the tips. They makes the wings more efficient.
WINGLET - A small, stabilizing, rudderlike addition to the tips of a wing to control or employ air movement.
WING LOADING - The maximum take-off gross weight of an aircraft divided by its wing area.
* Winglets, Fences, “Lateral” Flow, etc.
It is a common misconception that the wingtip vortices are somehow associated with unnecessary spanwise flow (sometimes called “lateral” flow), ...
[edit] Winglet
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Winglets (those small vertical extensions on the tips of some wings) are used to improve the efficiency of the wing by increasing the effective length of the wing.
Winglets, those vertical fins at the ends of the wings, make airplane wings more aerodynamic, cut fuel consumption between 3 and 5 percent, saving more than 100,000 gallons of fuel per aircraft per year while reducing noise and emissions.
Wing sweep is chosen almost exclusively for its desirable effect on transonic wave drag. (Sometimes for other reasons such as a c.g. problem or to move winglets back for greater directional stability.) ...
This limits the flow from high pressure to low pressure and reduces the downwash. In other words it reduces the induced drag. The following figure demonstrates the Win Tip Winglets, a common method to reduce induced drag in modern airplanes.
The DA20's waspish empennage and T-tail were still there, as was the short chord, long-span, high-aspect ratio wing with upturned winglets. The Star also sported a forward-opening canopy, ventral fin and composite MT prop.
 See also: Wing, Aircraft, Plane, Flight, Lift
  
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