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Old 28th Jul 2011, 18:08
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Morris542
 
Join Date: Aug 2010
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Although not a proffessional pilot I can offer you an explanation from my PPL technical book.

Modified wingtips [winglets] can reduce the amount of leakage of the airflow around the wingtip and therefore reduce the formation of induced drag.

Not very detailed however aircraft with wingtips are more efficient, both aerodynamically and in terms of fuel burn.
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