Posted on 02/07/2012 11:05:54 AM PST by DeoVindiceSicSemperTyrannis
They are claiming that 680 MPH IS the speed of sound at 120k ft. I’m not sure if that is correct or not. I know that the speed of sound is about 760 mph at sea level.
He had a small drogue chute and did not exceed the speed of sound.
What I would be concerned about is when he breaks the sound barrier the dynamic forces on his body will change such that he becomes an unstable falling object and then experience G forces that may render him unconscious.
I wear a parachute when I fly my glider. I sure as hell am not stepping outside unless the glider is total uncontrollable.
I’m obviously no scientist, and I wonder why terminal velocity (120 mph or something) doesn’t come into play here if it’s supposedly “terminal”. I mean, he isn’t using power to drop, is he?
I’m confused. Help!
cheers
Jim
There’s no terminal velocity in space. Thinner air = higher terminal velocity.
On the way, he (Kittinger) became the first man to exceed the speed of sound -- without a plane.
I think you reach speeds in excess of TV just by going into a delta position arms to sides.
Terminal velocity depends on air resistence and gravity.
120 mph is only good for 10,000 feet or so.
Terminal velocity from stationary in space is 7 miles per second = escape velocity, which is the same thing in reverse if there is no air.
Thanks! Does that mean he’ll start slowing down as the atmosphere gets more dense?
cheers
Jim
Man that gives me the heebee jeebees just looking at that picture!
Is it too late to add this guy to my “Dead Pool?”
Thanks.
cheers,
Jim
Can he hold off attempting this until next January so I can put him on my Celebrity Dead Pool list for 2013?
Dang, I knew I should have read all the posts before posting a comment... ;-)
This is definitely a Special Darwin Experience! Will we get to see Video of the explosion that will win him the Darwin Award of 2012???????
The speed of sound is dependent on air temperature.
He won't reach that speed.
Based on wind resistance, the terminal velocity of a skydiver in a belly-to-earth (ie:face down) free-fall position is about 122 mph.
This velocity is the limiting value of the acceleration process because the effective forces on the body balance each other more and more closely as the terminal velocity is approached.
In this example, a speed of 50% of terminal velocity is reached after only about 3 seconds, while it takes 8 seconds to reach 90%, 15 seconds to reach 99% and so on.
Higher speeds can be attained if the skydiver pulls in his or her limbs. In this case, the terminal velocity increases to about 200 mph which is almost the terminal velocity of the Peregrine Falcon diving down on its prey.
The same terminal velocity is reached for a typical .30-06 bullet dropping downwards—when it is returning to earth having been fired upwards or dropped from a tower—according to a 1920 U.S. Army Ordnance study.
Competition speed skydivers fly in the head down position and reach even higher speeds. The current world record is 614 mph by Joseph Kittinger, set at high altitude where the lesser density of the atmosphere decreased drag.
So this guy hopes to break the current world record by 76 mph? The physics don't support it.
And if he does, as you say, he's dead meat.
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