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View Full Version : This doesn't seem like the best idea to me



slo_1_2_3
08-13-2007, 10:59 PM
http://www.dailymail.co.uk/pages/live/articles/news/wor...4879&in_page_id=1811 (http://www.dailymail.co.uk/pages/live/articles/news/worldnews.html?in_article_id=474879&in_page_id=1811)
I mean didn't planes break up when they neared the sound barrier before they wer designed better for super sonic. I'm thinking people aren't designed to go that fast,and won't he heat up in re entry or when he's falling anyhow.
I wanna see how this turns out

Esel1964
08-13-2007, 11:19 PM
I agree with you,not a good choice for a 63 y.o. w/ no backing from USAF and NASA like Colonel Joe Kittinger (http://www.firstflight.org/shrine/joe_kittinger.cfm).

He'd better have the "uber" thermal suit,considering the differences in inner/outer temp.

f.ip2
08-14-2007, 12:13 AM
well he does not have wings or fragile parts to break / rip off.

I am more concerned about the problem to what happens when the parachute does not open?

Blood_Splat
08-14-2007, 12:47 AM
Originally posted by f.ip2:
well he does not have wings or fragile parts to break / rip off.

I am more concerned about the problem to what happens when the parachute does not open?
Splat.

LEBillfish
08-14-2007, 12:55 AM
http://img.photobucket.com/albums/v707/Kaytoo/wing.jpg

TheGozr
08-14-2007, 01:25 AM
Altitude.

rockgardenlove
08-14-2007, 03:41 AM
That dude is nuts, but I'd be lying if I didn't mention it's pretty cool too.

partic_3
08-14-2007, 05:12 AM
63 eh? I guess it's better to burn up than fade away.

mrsiCkstar
08-14-2007, 05:41 AM
I wonder how powerful the deceleration will be once the parachute does deploy... he could end up breaking stuff in his body.

MEGILE
08-14-2007, 05:52 AM
Originally posted by mrsiCkstar:
I wonder how powerful the deceleration will be once the parachute does deploy... he could end up breaking stuff in his body.

I suspect he would have slowed down considerably by that time

p-11.cAce
08-14-2007, 06:33 AM
I wonder how powerful the deceleration will be once the parachute does deploy
He will be slowed to the same speed as any other skydive by the time he gets to opening altitude. In fact, the whole jump is really not as dynamic as it seems.
At 70,000' the SR-71 can have a true airspeed of 1800 kph but indicate only 377 kph due to the low air density. So even at high speed the pressures encountered due to air resistance is no different than that experienced at lower altitudes. The deceleration during the freefall should will not be as "hot" as experienced by orbital re-entry, but more like the "cool" sub-orbital reentry of SpaceShipOne, which does not have any thermal protection.
Incredible experience none the less - brave man be sure.

WTE_Ibis
08-14-2007, 06:42 AM
It's a long way down.

http://premium1.uploadit.org/Ibissix//Jump-from-space.jpg

BSS_Goat
08-14-2007, 08:18 AM
They might as well go ahead and dig a hole....he's a dead man.

NeuralTech
08-14-2007, 08:41 AM
Amazing, those Frenchmen and their crazy heights...

Viper2005_
08-14-2007, 09:08 AM
It's just the old IAS vs TAS debate again.

Essentially what will happen is that he'll accelerate to his terminal IAS and then maintain that IAS all the way down until his parachute opens.

Of course, at very high altitude his terminal IAS will equate to a pretty considerable TAS, and he may well break the sound barrier. However, contrary to the tabloid fizz the stagnation temperature even at Mach 1.5 or so is only going to work out at around 65 C, so thermal protection isn't really a massive issue.

The biggest risk to his health is tumbling because there's basically no aerodynamic damping up there. So he could quite easily tumble so fast that he sustains injury from the centrifugal forces (and force gradients) induced.

For this reason AFAIK Kittinger deployed a small drogue parachute on a static line to increase his stability.

Of course, since this guy wants to nab a speed record, there must be a temptation to trade stability for a drag reduction...

As has been said, the parachute opening shock isn't going to be a big deal. The biggest problem is likely to be that because he's got all sorts of kit with him (space suit, oxygen tanks etc) he'll be rather heavier than the average sky diver, so his canopy may have a rather above average wing loading if it was bought "off the shelf". This is particularly important when considering the size of any reserve parachute because all the mass adds up and you very quickly get into a vicious circle, culminating in a much bigger balloon being required.

Big balloons raise there own issues, with the the main ones being cost, quality control and inflation; he'll need an extremely still day in order to get the balloon inflated safely...

Interesting stuff, but I'm glad that I'm not paying for it!

CarpeNoctem43
08-14-2007, 10:09 AM
His crash helmet will have its own air supply and reinforced ear pads to protect him from the sonic boom as he breaks through the Mach 1 sound barrier.

His 'what' helmet??? http://forums.ubi.com/images/smilies/88.gif

carts
08-14-2007, 11:22 AM
http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gifNever mind the "Helmet" he may want a "man sized" incontinence product!

Zeus-cat
08-14-2007, 07:05 PM
Its probably already been done, back in the 60's by Joe Kittinger. Jumping out of a high-altitude balloon from about 103,000 feet he accelerated through the sound barrier at high altitude. Because the air was so thin he dropped very quickly and achieved very high velocity. The instrumentation he carried was primitive, so it is not known for sure if or when he may have broken the sound barrier, but people who have analyzed his jump think he did it.

Here is a link to the USAF site that credits Colonel Kittinger with breaking the sound barrier.

http://www.af.mil/history/person.asp?dec=&pid=123006518

slo_1_2_3
08-15-2007, 12:36 AM
Originally posted by f.ip2:
well he does not have wings or fragile parts to break / rip off.

I am more concerned about the problem to what happens when the parachute does not open?
Um......... Arms, Legs, necks, maybe his head. these seem like they might not do so well at mach 1, they'd be flapping around like hair and ties in a convertible.