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Originally Posted by ChopStix
.... Between the wingtip vortices and the clouding effect they are really cool pic's.
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Wingtip vortices, not contrails. My bad.
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Don't be so hard on yourself.
This phenomenon is why modern airliners have the upturned wingtips. See also
Prandtl V wing
https://en.wikipedia.org/wiki/Lifting-line_theory
Interesting fact:
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According to the Helmholtz theorems, a vortex filament cannot begin or terminate in the air.
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https://en.wikipedia.org/wiki/Horseshoe_vortex
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The horseshoe vortex model is unrealistic in that... In a more realistic model, the lifting-line theory, the vortex strength varies along the wingspan, and the loss in vortex strength is shed as a vortex sheet all along the trailing edge, rather than as a single trail at the wing-tips
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So there is a vortex sheet off the entire trailing edge with vortexial pinwheels at the tips.