Ot: Crazy? At least he had a helmet on.

[Cicli]

This guy is nuts.

https://news.google.com/news/ampviewer?caurl=http%3A%2F%2Fwww.chicagotribune.co m%2Fnews%2Fnationworld%2Fct-skydiver-without-parachute-20160730-story%2Camp.html#pt0-506878

[gasman]

and he made a successful jump:

https://www.yahoo.com/tv/skydiver-makes-final-preparations-jump-without-parachute-135354327--spt.html


Holy crap that is a video I want to see now that I know he nailed it.

[gasman]

Video

http://globalnews.ca/news/2857959/skydiver-successfully-lands-25000-foot-jump-without-parachute/

[saab2000]

Did he really jump at 25,000' without an O2 source? I know they free fall very quickly and maybe he was breathing O2 before the jump but 25,000' with no O2 is a tough task for anyone.

Of course, within a minute or so he's in a better pressure situation but still..... If I were doing it with no O2 mask I'd want to be breathing from a source until about 5 or less seconds before the jump.

Maybe Dr. Gasman can comment. It's all about the internal partial pressure of the gasses. High altitude is no joke for the human body.

Edit: the Cessna Caravan in the picture was likely not at 25,000'................

Edit again....: No way was that 25,000'

Third edit: maybe it was 25k but I'm still somewhat skeptical of a Caravan fully loaded climbing to that altitude in summer. Maybe.

Anyway, it's impressive to land on a postage stamp after a long fall. I'm not a skydiver. It's impressive anyway.

[cadence90]

Yes, crazy waste of money.

Whatever.

[gasman]

Did he really jump at 25,000' without an O2 source? I know they free fall very quickly and maybe he was breathing O2 before the jump but 25,000' with no O2 is a tough task for anyone.

Of course, within a minute or so he's in a better pressure situation but still..... If I were doing it with no O2 mask I'd want to be breathing from a source until about 5 or less seconds before the jump.

Maybe Dr. Gasman can comment. It's all about the internal partial pressure of the gasses. High altitude is no joke for the human body.

Edit: the Cessna Caravan in the picture was likely not at 25,000'................

Edit again....: No way was that 25,000'

The plan I heard was he was going to jump from 25,000 ft with bottled O2 and then pass off the bottle to one of his buddies at about 10,000 ft. Yea, if you don't have time to acclimate going to 25,000 will result in loss of consciousness unless you have supplemental O2. After all, a number have climbers have summited Everest at 29,029 ft without oxygen.
Saab- You would know the flight abilities of that Cessna and I believe you when you say they weren't at 25,000 ft.

Still, he was high enough to hit terminal velocity in a regular skydiving suit and hit that 100' by 100' net from a long way up.

Man

[saab2000]

The plan I heard was he was going to jump from 25,000 ft with bottled O2 and then pass off the bottle to one of his buddies at about 10,000 ft. Yea, if you don't have time to acclimate going to 25,000 will result in loss of consciousness unless you have supplemental O2. After all, a number have climbers have summited Everest at 29,029 ft without oxygen.
Saab- You would know the flight abilities of that Cessna and I believe you when you say they weren't at 25,000 ft.

Still, he was high enough to hit terminal velocity in a regular skydiving suit and hit that 100' by 100' net from a long way up.

Man

The "Service Ceiling" of the Cessna Caravan is 25'000 feet. But that's under ideal circumstances. It's not out of the question but unlikely.

Perhaps a skydiver will chime in, but I think terminal velocity of a skydiver is in excess of 100 MPH, meaning he will be down to a breathable air pressure within less than 1 minute. The "Time of Useful Consciousness" at 25k isn't that long but if he was breathing pressurized O2 until the time of the jump he may have been OK. Still, I'm skeptical of the altitude given.

Anyway, it's an impressive event for the diver and for the makers the net.

Yes, these things are a 'waste' of money, but so is a lot of stuff in life.

[gasman]

Yes, crazy waste of money.

Whatever.

I think Wilber and Orville heard these same words in 1903.:D

[cadence90]

I think Wilber and Orville heard these same words in 1903.:D

Oh, I'm sure the Bros heard much, much worse.

That said, I don't think many of us will be dive-bombing into our cubicles from 25,000' in 2129.

But, I may very well be completely wrong.* :D







*I will never know, because in any case I will have dive-bombed long before 2129. :(

[gdw]

First it was the guy in the wingsuit landing in a pile of cardboard boxes and now this guy and his giant net... what's next?

Terminal velocity is approximately 122-24 mph for a skydiver in an arched position. I left the sport years ago so things might have changed but Federal Aviation Regulations used to state that supplemental oxygen was required for any jump over 15,000ft.

[54ny77]

that is ab-so-friggin-lutely nuts.

article said he had 18k jumps in his experience. wow.

and the g-forces of terminal velocity to 0 in a fraction of a second? what's that gotta be?

bet that dude had a beer later that day. and some advil! :beer:

[Mark McM]

The "Service Ceiling" of the Cessna Caravan is 25'000 feet. But that's under ideal circumstances. It's not out of the question but unlikely.

It's true that the Service Ceiling is rated under ideal conditions. But it is also typically rated at Maximum Takeoff Weight. Jump planes are typically as unloaded as possible (they don't even have passenger seats), because their only purpose is to get the jumpers up to jump altitude as fast as possible.

The Cessna Caravan has an empty weight of 4500 lb. and maximum weight of about 8800 lb. Carrying the minimum load possible, it seems likely that it could reach 25,000 ft.

[Mark McM]

I think that the new articles are all mis-titled. Luke Aikins is the person that did highest freefall without a parachute on purpose, but he is not the person to survive the highest freefall ever. That title belongs to Vesna Vulovic, who fell 33,000 feet:

https://en.wikipedia.org/wiki/Vesna_Vulovi%C4%87