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#21
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Visible wingtip vortex!
"Tony Goetz" wrote As for the tiles being as hot as ****, I don't think it's unusual for the ground support guys and even the crew to wander around the shuttle not long after landing, even touching the tiles, so I doubt they're still too hot. by the time the shuttle touches down they've likely cooled to somewhat just cooler than ****. chuckle You are most likely right. I remember seeing people pick up a cube of tile material, just a few seconds after they came out of a furnace, glowing red hot. Amazing stuff, for sure. -- Jim in NC |
#22
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Visible wingtip vortex!
On Mon, 24 Oct 2005 21:34:59 GMT, "Tony Goetz"
wrote: A great example of this is when the space shuttle lands, particularly at Edwards (at KSC it tends to be humid so water vapor forms in the vortices and masks the refraction). I've noticed it a few times and it is mainly visible in video pointed right down the runway. Super high wing loading, I would guess. I searched for a while but could only come up with one decent video showing the phenomena. Pictures don't really demonstrate it. This video is in quicktime *.mov format, so my apologies if you can't view it. http://www.fotosearch.com/comp/FIL/FIL101/EV0116.mov The physics of it are just those of compressible flow. Change in density leads to change in the index of refraction of the gas. Visible, as someone else said, via the Schlieren optical system often used in transonic/supersonic wind tunnels. I've seen such a setup in action at the supersonic tunnel at my school. Pretty cool stuff. http://www.ae.su.oz.au/aero/super2d/ssflow3.html http://web.mit.edu/edgerton/people/v...schlieren.html -Tony Goetz Rocket scientist in training. Yep, that's it, except the one from the AA5 was tiny. It seemed to be no more than a 2" cone. Notice how you can't see it at ALL until it gets down into line of sight along the vortex. Same as my flight. Guys, I'm gonna get video...it will be on the site. It's just amazing looking. Bill Strahan ------------ Find a new reason to fly www.adventurepilot.com ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#23
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Visible wingtip vortex!
Where was the sun relative to your view? There is an effect called a "schlieren visualization" that describes why we see mirages and the like, sort of like seeing the heat rise off a candle. I once watched a shock wave dance around on the nacelle of a DC-10. The sun was the "coherent light source" low on the horizon. It was pretty strange to see. I have also read that NASA and DARPA have used high power optics from the ground to observe airflow around an aircraft at high altitudes. Dan D. I once watched the shockwave on the wing of a 757 in flight for quite a while. It was visible as a noticeable line of refraction in the air over the wing and it cast very distinct shadows on the wing. The shadows took the form of arcs similar to shadows cast on a stream bottom by ripples in the water. An airline pilot friend said they used to see them on the wings of 727's when they would get up close to their highest cruise speed. |
#24
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Visible wingtip vortex!
"Bill" wrote in message ... On Mon, 24 Oct 2005 18:56:44 GMT, ".Blueskies." wrote: The sun was ahead, and above the wing. Not so bad that it was blinding us though. If I had to guess....draw a line from us as observer to the wingtip. The sun was 20-30 degrees higher than that. It definitely wasn't close to head on. FWIW, this was about 5:30 yesterday, Paris, Tx area. Bill Strahan ------------ Find a new reason to fly www.adventurepilot.com Found mo http://www.nasa.gov/centers/dryden/n...-033-DFRC.html |
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