Wingtip vortices on conventional wingtip and blended winglet
A winglet is a near-vertical extension of the wing tips.
Wake turbulence: Wingtip vortices generated behind a wing producing lift. Behind a large heavy aircraft they can be powerful enough to roll or even break up a smaller aircraft.
WAKE TURBULENCE Turbulent air condition caused by small, tornado-like horizontal whirlwinds trailing an aircraft's wingtips (wingtip vortices).
It is a common misconception that the wingtip vortices are somehow associated with unnecessary spanwise flow (sometimes called “lateral” flow), and that they can be eliminated using fences, winglets, et cetera.
The result is that the wing is more efficient (wingtip vortices are reduced) and generates less drag.
Consequently the blades are subject to the same aerodynamics - induced drag, parasite drag, wingtip vortices, lift/drag ratios at varying aoa, pressure distribution changing with aoa etc.
Lift Induced Drag: Drag resulting from turbulence originating in the wingtip vortices that are created when the wings begin to generate lift.
LDA: Landing Distance Available.
LRA: Landing Run Available.
Fig 15 Condensation showing the distribution of lift along a wing. The wingtip vortices are also seen. (from Patterns in the Sky, J.F. Campbell and J.R. Chambers, NASA SP-514.) ...
Speed Lift - Drag Relationship Elements Affecting the Angle of Attack
The Effect of Flight Controls and Trim Devices The Effect of High Lift Devices The Effect of Roll The Effect of Wingtip Vortices ...
 See also: Vortices, Wingtip, Aircraft, Flight, Power
  
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