# Supersonic Jump

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• 10-14-2012, 08:32 PM
deerfield
Supersonic Jump
Earlier today, guy rode a balloon to an altitude of 128,000 feet, just over 24 miles above the earth's surface. He jumped after the two and a half hour ascent to free fall back to earth. It took 48 seconds for him to reach Mach 1, breaking the sound barrier. Top speed reached during his free fall was estimated to be 834 MPH. Very cool.

• 10-14-2012, 09:40 PM
Lawdog
Yeah I was going to make that same jump yesterday but I didn't want to be late for work if you know what I mean....LOL....Pretty impressive though.
• 10-14-2012, 09:47 PM
rdlangston13
So we had this discussion at dinner. What is terminal velocity??

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• 10-14-2012, 10:13 PM
lewisb13
It depends on a lot of factors. Air density being the big one here. Attachment 16313
• 10-14-2012, 10:28 PM
lewisb13
That came out crappy. Its....

V=sqrt(2mg/pAC)

M=mass in kg
G = acceleration due to gravity in this case 9.81 m/s^2
Rho(p) = density of the fluid in this case its air (yes air is a fluid)
A= cross sectional area (so for example if you were a square, your value here would be length*width)
C = drag coefficient (this is a constant, changes i.e. if you're wearing sandpaper vs wearing latex)
• 10-14-2012, 10:48 PM
lsvboombox
Cant believe the chute deployed 20 seconds before getting the freefall record. He jumped 30000 feet higher than kittinger and still didnt get the freefall record. Still ballzy but i would be pissed i didnt get the freefall record.
• 10-14-2012, 11:01 PM
rdlangston13
The argument was made that the lack in air density would be cancelled out by the reduced force of gravity being 24 miles up. It was based on 0 science and just people's opinions/thought.

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• 10-14-2012, 11:04 PM
lewisb13
Quote:

Originally Posted by lsvboombox
Cant believe the chute deployed 20 seconds before getting the freefall record. He jumped 30000 feet higher than kittinger and still didnt get the freefall record. Still ballzy but i would be pissed i didnt get the freefall record.

I dont think his goal was to get the free fall record, I thought it was to break the speed record. If he would have jumped with limbs outstretched he would have broken the free fall record. Its my understanding he jumped like a pencil, not like a skydiver.
• 10-14-2012, 11:18 PM
lsvboombox
Quote:

Originally Posted by lewisb13
I dont think his goal was to get the free all record, it was to break the speed record. If he would have jumped with limbs outstretched he would have broken the free all record. Its my understanding he jumped like a pencil, not like a skydiver.

He beat kittingers speed record before he hit the height at which kittinger jumped 103k.
At that height it doesnt matter whether your hands are in or out there is nothing slowing you down there's no resistance.
• 10-14-2012, 11:40 PM
lewisb13
So did he deploy the chute "early?"
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