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Old 07-02-2017, 01:23 AM   #671 (permalink)
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Originally Posted by ChopStix View Post
Those pic's were taken by my active duty friend while in Germany. They had the F35 at an airshow. Between the wingtip vortices and the clouding effect they are really cool pic's.
Wingtip vortices, not contrails. My bad.



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Old 07-02-2017, 11:44 AM   #672 (permalink)
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Quote:
Quote:
Originally Posted by ChopStix
.... Between the wingtip vortices and the clouding effect they are really cool pic's.
Wingtip vortices, not contrails. My bad.
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:

Quote:
According to the Helmholtz theorems, a vortex filament cannot begin or terminate in the air.
https://en.wikipedia.org/wiki/Horseshoe_vortex

Quote:
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
So there is a vortex sheet off the entire trailing edge with vortexial pinwheels at the tips.
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Old 07-02-2017, 09:36 PM   #673 (permalink)
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Don't be so hard on yourself.
In this case I knew the difference. I just didn't look at the pictures close enough.
So yeah I was a dum-bass on this one.... (-lol)


Here's a nice example of a brick shaped rear end.

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Old 07-02-2017, 09:44 PM   #674 (permalink)
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