Basejumper.com - archive

No nothing other than newspaper....happened yesterday.....miraculously is okay apparently
http://www.dailymail.co.uk/...ground-survives.html

I've seen the entire video (from another angle), and the canopy had full inflation prior to impact. It looked like the jumper landed without popping the toggles.

From the other angle, it appears to have been a bad exit (very head low) on a PCA, which resulted in an entanglement between the jumper's body and the lines, delaying the inflation until the entanglement resolved. Fortunately, that happened very quickly, and the opening was delayed enough to look dramatic on that cell phone video (the one in the link) that moves away before the canopy achieves inflation and the jumper reaches the ground.

But seriously, who jumps a building in broad daylight with that many bystanders casually filming? WTF?

Damn .. He definitely needs a JM holding on both sides of him, because he was Kicking like an AFF level-1 stepping off on exit and threw free fall .
Kicking and air swimming won't save your life .
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Maybe kicking actually saved his life. You know, like if something was entangled or something...

Let's wait for his own words, once he decides to share them.

Micke
BASE 268
Team Bautasten

If you're going to jump like that then yes you should make sure there's good video.

Hm, nordic standard since John Mjøen

Havent you seen 1. And 2. Base?

I believe he had wrapped something around his leg and was kicking it off.

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I think his words might go like this .

The Video ground crew said ..." go for it dude, Are you Ready" !
Me.. being the day blazing professional I am . With wanting to make a lasting impression for the girls in the crowd below . The emoticon 'Light Bulb' flashed above my head with the thought ?
I need a video that has staying power rival John Holmes . A base video that will get passed, shared around basejump.com for years .
I said ... " There will be no bland 45 deg. body, and head-high exit for this boy ".
Oh No that not for me, I need something ostentatious, but an Exit that's not to over the top bordering egotistic exhibitionism . A proper boring old school PCA exit just ain't flashy enough for this crowd .
So I said ..." FUCK IT ".
I then tied a Blindfold over my eyes, Exited, diving straight out like I was diving into shallow end of the Pool . Then when feeling some discomfort pulling on my foot the millisecond I dove off, I started kicking and swimming like an AFF level-1 in free fall .
My last thoughts were. I'm dead ..OH oh.. but but ..NOT TODAY ! , Ouch this Hurts .
.
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looks like he slipped prob ice up there...u can hear the canopy open when old mate pulled the camera away just at the worst time...cunt must have been split second away from impacted before the canopy slowed him enough to survive....hate how the news wankers always says people hit the ground from 2million feet with no parachute out and survive ..

Kicking started the entanglement....it MAY have helped him clear it.
In a head down situation you're better to drive the knees into your chest keeping your legs clear of the deployment and limiting any forward rotation. Close effing call!

Bringing your knees into your chest will shorten you body length and dramatically increase any forward rotation, because angular momentum is conserved.

It would if the act of bringing your knees to your chest didn't create a moment around your center of gravity.

I have to disagree. I've been a trampolining coach for over 30 years. Tucking is a standard technique for speeding up rotation, and is easily demonstrated.

As a physicist I have to agree with RichM.

I guess I should have been more clear. I wasn't arguing against the change in moment of inertia.

The only reason I posted was that you said that driving your knees to your chest will limit forward rotation. That is fundamentally wrong, it will increase the rotation; and it may be important to some people who don't have appropriate training to understand that.

It may be that you didn't mean that and you do understand what will happen. But I can only respond to what you have written.

I'm not the person you originally replied to. That was Base587

I was only stating that imparting a moment opposite of the direction of rotation can counteract it.*

*assuming the rotation is slow enough combined with the change in moment of inertia is smaller than the imparted moment.

Sorry, I missed you weren't the person with the original comment.

I agree with you, although I do think that in this case there is no way to impart a countering moment once you are in the air, without contact with another body. In this case I can only think of the bridle wrap countering the rotation, or the ground.

That clarifies things a bit.

I also agree, in this case the object was much to low for any sort of corrective maneuvers. I believe it was a PCS or SL as well.

Such luck. Is there a better video of this online?

Please explain why these jumpers are tucking to do a backloop. Why is are they not going headdown. Here are the links;
https://www.youtube.com/watch?v=-HJO6Xjl1-o
https://www.youtube.com/watch?v=V7_gqD2bjIw
https://www.wikihow.com/Backflip-off-a-Wall
Take care,
space

I see a big difference now after studying Trampoline jumps and BASE launches. I am not so familiar with Trampoline.
Trampoline jumpers jump vertically. BASErs dont. Totally different vectors. BASErs launch on their vector to be in a position to stick the stable , Acro or flight positions. Trampoliners do the same vertically but much faster than BASErs. So your theory seems invalid. Care to enlighten?
Take care.
space

They are tucking to accelerate the rotation. If they were to stay straight they would take longer to get over.

Acceleration of rotation by shortening the rotating body length is caused by conservation of momentum. It's a physics fundamental.

Watch an ice skater spin, when they bring their arms in they shorten their length perpendicular to the rotational axis and spin faster, they then extend their arms to slow down.

I also believe that a knee surge will not nearly be enough to counter the rotation. Mostly because the resulted mass shift(legs are heavy, but not THAT heavy) will have to be done at insane speeds to heave any effect. Just think of the reaction wheels on spacecraft, those are damn heavy and rotate at insane speeds, while attitude changes are very slow. A similar scenario is a typical underrotated frontflip from KL tower, lots of video for those. People usually have less than 90 degrees to go, they fully tuck(thus the reduction on inertia moment helps, not fucks it up as in the discussed case) and swing their arms viscously, but generally to no avail.

As for bridle wrap stopping the rotation, I have, on more then one occasion, stopped a serious head-low to frontflip situation(immediate deployment once realized) by actually hitting my feet on the deploying canopy fabric
Not that this should be considered a reliable tactic to save your ass, it's more of blind luck really. But it works.