Wingtip vortices

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  F/A-18C showing wing tip vapor trails
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  F-18 vapor
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  F/A-18F showing vapor cloud over its wings
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  Wingtip vortices stream from an F-15 as it disengages from a KC-10 Extender following midair refueling.
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  A NASA study on wingtip vortices produced these pictures of smoke in the wake of a crop duster.
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  Wingtip vortices behind C-17 Globemaster
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  Wingtip vortices from a Cessna 182 wind tunnel model.