27 of68 Wing Tips and Drag Training
  Air flows differently over the tip of a wing than over the middle of it
Because a wing is three dimensional, unlike an airfoil shape, air flows differently at the wing tips than over the middle of the wing. The wing tip creates a vortex, or whirlpool of air, that causes drag. The bigger the wing tip compared to the rest of the wind, the larger the vortex, and the greater the drag.
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