Posted on 02/07/2012 11:05:54 AM PST by DeoVindiceSicSemperTyrannis
He missspoke. It is related to temperature but independent of density.
clank clank clank
The change in the speed of sound from sea level to one mile elevation is less than 2%.
http://www.grc.nasa.gov/WWW/K-12/airplane/sound.html
If you also have 30~40°F less temperature, you lose a couple more percentage points. The change is just not significant to believe you could measure the difference without measurement equipment.
Do us a favor and don’t pretend to understand the physics of it. It is pretty clear the guy doing the jump knows more about it. When Kettering did this he got withing 20 or 30 mph and did not burn up. There is not much air up there to heat you up. To say nothing of the amount of COOLING you get from -90 degree air blasting past you. Plus the heating at mach 1 for a short period of time is not that much. Compared to the thermal undies he needs to survive the cold assent that heating is nothing at all.
But anyway, I'll hold my opinions.
But you do me a favor and get back to me when this dude fails or dies in the attempt. Until then, nothing posted on this thread by anyone is worth a damn.
Great minds think alike.
The G forces I was refering to were those that a spinning body would be subjected to. I did not make that clear in my post. As long as he is stable it will not be a problem. If he starts spinning it could be a problem.
Joseph W. Kittinger - Skydiving From The Edge Of The World
http://www.youtube.com/watch?v=QxfdC7U_mgQ
Thanks,
It will be interesting to see the results.
Interesting from a distance, not interesting enough to participate.
Thanks!
cheers,
Jim
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