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ChasKi 
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
 Posted: Feb 07, 2012 - 08:19 PM
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First post: Mar 04, 2009
Total posts: 2481
Location: Plymouth/Stroud
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| Even just as another stunt, I'd be impressed personally. Pushing the boundaries like that is a good thing most of the time! |
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CjKit
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 07, 2012 - 08:22 PM
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First post: Nov 01, 2010
Total posts: 2056
Location: NW London
Status: Offline
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| Yeah, I didn't mean it wouldn't be impressive. It just adds a whole new dimension. |
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ChasKi
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 07, 2012 - 09:03 PM
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First post: Mar 04, 2009
Total posts: 2481
Location: Plymouth/Stroud
Status: Offline
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Or paradigm?  |
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fergalsharky
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 07, 2012 - 09:42 PM
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First post: Nov 20, 2011
Total posts: 112
Location: brighton
Status: Offline
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| That's pretty hardcore rather him than me though |
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Toeknee
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 07, 2012 - 11:51 PM
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First post: Jan 01, 2012
Total posts: 7
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Did crack me up this morning when he was saying about the free-fall causing him to accelerate to about 690mph and then saying "we dont really know what it does to a human".
Rather him than me! Impressive nonetheless |
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JakeDurbs
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Post subject: Re: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 08, 2012 - 10:18 AM
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First post: Sep 06, 2011
Total posts: 318
Location: Oxford
Status: Offline
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Toeknee wrote:
Did crack me up this morning when he was saying about the free-fall causing him to accelerate to about 690mph and then saying "we dont really know what it does to a human".
Rather him than me! Impressive nonetheless
Technically we've been up to 760ish on land, 2190mph in a plane and 17,500mph in a space shuttle, but no ones been stupid enough to put their head out the window. It's the changes of accelaration that mess you up.
Pretty mega, I did a tandem jump once and even at those heights you lose reference points and it's only the noise and wind that lets you know you're moving, take those out and add the fact you are nearly in space and it'd be a complete mindf*ck!
Just as a little thought, Any idea when he hits terminal velocity? Is it high where resistance is low but gravity also lower, or lower where Gravity is high but resistance is also high? Guessing he deaccelarates when he hits the different layers of the atmosphere? |
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CjKit
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Post subject: RE: Re: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 08, 2012 - 11:59 AM
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First post: Nov 01, 2010
Total posts: 2056
Location: NW London
Status: Offline
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| Terminal velocity is simply a measure of the greatest speed possible when an object is moving through a specific medium. Therefore he'll achieve different terminal velocities as he passes through areas of different atmospheric density. When he enters the lower level of the atmosphere, the one we all live in, he'll decelerate until he reaches that specific terminal velocity. Apparently the terminal velocity of a skydiver from normal altitudes, in the classic 'belly-to-earth' position, is 122 mph - so I'd imagine the 690mph maximum speed he referred to would occur pretty soon after he leaves the capsule. |
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Mutley
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Post subject: RE: Re: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 08, 2012 - 02:06 PM
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First post: Oct 06, 2006
Total posts: 432
Location: Here And There
Status: Offline
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| And gravity stays constant with altitude. It is the foward velocity of a satallite that keeps it up, not lack of gravity. If it were to lose this foward velocity then gravity would make the sattelite fall back to earth like a stone. |
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ChasKi
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Post subject: Re: RE: Re: RE: Re: RE: Skydiver to jump from edge of space!
Posted: Feb 08, 2012 - 02:23 PM
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First post: Mar 04, 2009
Total posts: 2481
Location: Plymouth/Stroud
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Mutley wrote:
And gravity stays constant with altitude. It is the foward velocity of a satallite that keeps it up, not lack of gravity. If it were to lose this foward velocity then gravity would make the sattelite fall back to earth like a stone.
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JakeDurbs
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Post subject: Re: RE: Re: RE: Re: RE: Skydiver to jump from edge of space!
Posted: Feb 08, 2012 - 05:37 PM
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First post: Sep 06, 2011
Total posts: 318
Location: Oxford
Status: Offline
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Mutley wrote:
And gravity stays constant with altitude. It is the foward velocity of a satallite that keeps it up, not lack of gravity. If it were to lose this foward velocity then gravity would make the sattelite fall back to earth like a stone.
As altitude increases then the effect of gravitational accelaration (g) decreases as you are further away from the earth's core. If this wasn't the case, g would be the same at every point on the earth's surface (rather than an "averaged" value of 9.81), but as it stands even teh top of Mt Everest yields a g that is roughly 0.3% of what it is at the surface. The effect of gravity in a space shuttles orbit is roughly 90% of what it is on the earth's surface. Big G (Gravitational Constant) is constant no matter where you are though.
I'll take the terminal velocity hit and rephrase it as "anyone know when will he hit his maximum speed and how much of a retardation is there when he hits the various layers of atmosphere?" Which CjKit has answered! |
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Mutley
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Post subject: Re: RE: Re: RE: Re: RE: Skydiver to jump from edge of space!
Posted: Feb 09, 2012 - 09:24 AM
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First post: Oct 06, 2006
Total posts: 432
Location: Here And There
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JakeDurbs wrote:
Mutley wrote:
And gravity stays constant with altitude. It is the foward velocity of a satallite that keeps it up, not lack of gravity. If it were to lose this foward velocity then gravity would make the sattelite fall back to earth like a stone.
As altitude increases then the effect of gravitational accelaration (g) decreases as you are further away from the earth's core. If this wasn't the case, g would be the same at every point on the earth's surface (rather than an "averaged" value of 9.81), but as it stands even teh top of Mt Everest yields a g that is roughly 0.3% of what it is at the surface. The effect of gravity in a space shuttles orbit is roughly 90% of what it is on the earth's surface. Big G (Gravitational Constant) is constant no matter where you are though.
Thats fair enough but to all intents and purposes it is a constant in most cases. My point was that satellites don't float because there is no gravity in space but because they are travelling foward like a bat out of hell. |
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JakeDurbs
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Post subject: RE: Re: RE: Re: RE: Re: RE: Skydiver to jump from edge of sp
Posted: Feb 09, 2012 - 11:09 AM
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First post: Sep 06, 2011
Total posts: 318
Location: Oxford
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indeed, astronauts don't even float because there is "no gravity" in space, it just looks that way due to them being in freefall.
My point was if all other things were equal (i.e air resistance), i'd imagine he'd fall at a slower speed than he would close to the earth. But that's a side thought, let's just focus on how much of a hero this guy is for attempting it! |
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Mutley
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Post subject: RE: Re: RE: Re: RE: Re: RE: Skydiver to jump from edge of sp
Posted: Feb 09, 2012 - 04:18 PM
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First post: Oct 06, 2006
Total posts: 432
Location: Here And There
Status: Offline
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| Yeah, the guy is a legend only second behind Kissenger who did the same jump three times over fifty years ago in a dodgy rubber suit!! |
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Spacedeck
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Post subject: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 14, 2012 - 10:49 PM
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First post: Feb 14, 2012
Total posts: 73
Location: Huddersfield, UK
Status: Offline
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col.g wrote:
Yeah there was a program about it or rather the us airforces various tests they conducted in the 50's and 60's.
They sent him up in a balloon in a pressure suit with a camera. his suit sprung a leak but he carried on up to the height anyway and jumped out, in the program had him saying he thought he was just stuck there as there was no sense of motion due to lack of atmosphere, he then turned and looked back at the balloon and he was going really really fast and then slammed into turbulance as he hit thicker atmosphere. Sounds fun 
Sound amazinly epic but scarey as 
I always wondered if you broke far enough up, eve if you jumped out you just wouldn't fall back down cause it was out of the gravity pull. |
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charlie
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Post subject: RE: Re: RE: Skydiver to jump from edge of space!!!
Posted: Feb 15, 2012 - 01:01 PM
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First post: Oct 11, 2004
Total posts: 8993
Location: York
Status: Offline
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| The question is: What happens if he farts in his suit? |
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