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19th February 2008, 2:17pm
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#1 | | Larger Than Life
Join Date: Jun 2001 Location: Mankyland
Posts: 16,852
| How extreme do you want to get?
British stuntman Steve Truglia is planning a World Record sky dive.. 120,000 ft... breaking the current world record "Project Excelsior III" jump, set in 1960, of 102,800 ft by Joe Kittinger http://www.spacejump.co.uk/
With the thin, virtually non exsistant atmosphere at that level, there's no air resistance and no terminal velocity, so he'll get up to speeds of 700mph..
HUGE balls!
Al | 
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19th February 2008, 2:29pm
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#2 | | Caissa's DeathAngel
Join Date: Dec 2004 Location: Beneath a blade
Posts: 16,527
| Re: How extreme do you want to get?
Christ! Good luck to him, he's braver/stupider than most of us!
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19th February 2008, 2:34pm
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#3 | | ShakingTheDisease SuperMod
Join Date: Sep 2002 Location: Ptolomea
Posts: 19,664
| Re: How extreme do you want to get?
Quote: |
With the thin, virtually non exsistant atmosphere at that level, there's no air resistance and no terminal velocity, so he'll get up to speeds of 700mph..
| before burning up on re-entering the atmosphere presumably. ooh, ooh!
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19th February 2008, 2:44pm
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#4 | | Punisher Moderator
Join Date: Sep 2002 Location: Glasgow
Posts: 8,520
| Re: How extreme do you want to get?
Come on Al, you know better than to say no air resistance and no terminal velocity.
Don't see how the risks are all that higher than on any other skydive apart form the life support equipment being required at such high altitude.
As for the claim of breaking teh sound barrier by travelling at over 700 miles per hour, I want to check that out.
Hmmm it appears that at 120,000 feet the speed of sound is about 710 mph, I though it was a good bit higher.
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19th February 2008, 3:06pm
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#5 | | ShakingTheDisease SuperMod
Join Date: Sep 2002 Location: Ptolomea
Posts: 19,664
| Re: How extreme do you want to get?
it'd be interesting to see how his speed, acceleration etc all change as he gets closer to the earth, and where the top speed comes - pretty soon after jumping i'd imagine; if terminal velocity at normal parachuting heights is around 120mph, i guess he'd quickly hit his maximum and slow down gradually to the stable speed. wierd to think of slowing as you plummet though.
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19th February 2008, 3:30pm
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#6 | | Punisher Moderator
Join Date: Sep 2002 Location: Glasgow
Posts: 8,520
| Re: How extreme do you want to get?
It shouldn't be too hard to work out.
Look a up a standard atmosphere table to see how density increases as altitide decreases.
You know the start point and the initial acceleration.
Determine the coefficeint of drag the body (although this is complicated by the transfer trhough subsonic to transonic and into supersonic flight regimes).
If you know the Drag Coefficient, dimesnions of the body, the initial accelaration and altitude you can determine air density and velocity of the body and thus the forces acting upon it at any point which allows you (until shock formations screw things up) to do a series of iterations ot find the point where maximum velocity is reached.
Actually that's not easy.
__________________ No matter where you go, you are what you are player
And you can try to change but that's just the top layer
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19th February 2008, 3:31pm
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#7 | | Beards!
Join Date: Mar 2003 Location: EK OK!
Posts: 8,636
| Re: How extreme do you want to get?
This thread makes my head hurt  | |
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19th February 2008, 4:16pm
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#8 | | Larger Than Life
Join Date: Jun 2001 Location: Mankyland
Posts: 16,852
| Re: How extreme do you want to get?
Quote:
Originally Posted by Jushin Liger Come on Al, you know better than to say no air resistance and no terminal velocity.
Don't see how the risks are all that higher than on any other skydive apart form the life support equipment being required at such high altitude.
As for the claim of breaking teh sound barrier by travelling at over 700 miles per hour, I want to check that out.
Hmmm it appears that at 120,000 feet the speed of sound is about 710 mph, I though it was a good bit higher. |
I didnt say there was no air resistance and TV, I said it was virtually non existant.. I was simplifying things for the peope reading this.. 
Oh, and no mater how stupid or brave you'd have to be... I'd do it 
Al | |
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19th February 2008, 4:51pm
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#9 | | ShakingTheDisease SuperMod
Join Date: Sep 2002 Location: Ptolomea
Posts: 19,664
| Re: How extreme do you want to get?
I'd certainly do it, it'd be quite a buzz.
How do they get the balloon back, I've always wondered?
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