impossible to kick out linetwists

[superstu 0]

where did you start counting the seconds?

i highly dought that he was going 150mph because 3 of us were able to keep up with him pretty well. we were all loading at about 2.2 on vx's and velo's

but yeah, it is a good illustration of how shit can go bad and quick.

Slip Stream Air Sports
Do not go softly, do not go quietly, never back down

[The111 1]

I didn't bother counting seconds, but 12k - 7.5k = 4.5k, not 5.5k.

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[bob.dino 1]

15sec into the video is when the canopy first appears in frame, and 40sec is when there are no longer any twists in it. Ergo 25sec.

But yeah, obviously I can't do maths. It should've been 4,500ft not 5500ft.

[pchapman 279]

Quote

Or if you were "on" your back but decided to start kicking out, wouldn't you be alternating from belly to back every half twist? Or is there some physical phenomenon that causes the jumper/harness to always orient back to earth during a hard linetwist spiral?

Two ideas come up:

1) If one is alternating on-belly and on-back while twisting up or untwisting, one may both remember and talk about the on-back part more, because that's the more disturbing situation to be in. "No s___, there I was, on my back, spinning...."
It's sort of like remembering and complaining about all the red traffic lights one gets, while forgetting that one also got plenty of green lights.

2) There may be an aerodynamic tendency to stay on one's back: When suspended from a canopy, a jumper's typical position is effectively massively dearched, so in a high speed spiral, the jumper tends to be stable when in a back-to-the-wind position!

The stability wouldn't be as strong as in 120 mph freefall, but I'm guessing it could still be a factor with a small canopy that spins up after opening, even with brakes set.

Hmm, this then suggests the idea that using body positions for a freefall barrel roll, might help in getting the untwisting started. Wonder if it would work?

The video of the VX jumper shows him fighting quite a while to get the untwisting started. Very roughly, I timed 6 seconds to spin up into 4 line twists, 13 seconds of struggling to start to untwist, and only 5 1/2 seconds to undo all 4 line twists, once he got the untwisting started.