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Granted there's pro's and cons to having either set up on your container, but someone once mentioned to me when discussing free falling low objects, that there is actually more pull force required to open a shrivel flap then there is required to extract two pins. Just wondering if any one can speculate a bit more on this, seeing as how I know some people opt to get a Velcro/super vent supreme for their low set up.

I would speculate that the wear on velcro has an impact on the pull force.

Also, pack jobs like this probably don't help.

People that get velcro for their low setups probably prime their velcro to hell... whereas the difference between a primed pin and a not primed pin is pretty much negligible.

Pins, with the pin tab on the bridle ideally located, stand up and then lever out of the closing loop with very minimal force, especially with spectra closing loops and lower pin tension.

Ultimately, I think it is preference, and a really primed velcro rig (read: barely closed) and a mildly primed pin rig with an ideal, low-tension setup would open at the same height +/- error with each system depending on the day/conditions/pitch technique/etc.

Also, what do you mean by "low" setup?? Like basement low or just slider down, because having a velcro rig for just slider down jumps does have other pros when not being used in the ultra-low environment. For example, if you snag it on an antenna, you can hear it coming apart and stop in time to save the packjob, rather than just "pop" and your packjob falls out... or simplicity is also a nice argument for a velcro rig.

I'll refer you back to the tread of the Perion incident with the PC in tow. I've had the pull force on curved pins exceed 1000 lb's. It broke a closing loop made from 1000 lb. HMA.

Lee

Yes, wear on the velcro does have an impact on pull force. No, his pack job does not impact the pull force. No matter how full or how empty the container is, the pull force will be the same, un like a pin rig.

http://www.watchthybridle.com/2013/10/pinlocks/

http://www.watchthybridle.com/...pin-locks-in-detail/

so whats the problem with pin rigs? is it that ULTRA rare occasion where youre so twisted body position-wise at deployment time that this becomes an issue? i have seen videos and studied discussions about how pull direction can affect your pins, but it seems like youd have to be pretty out of whack for that to affect you, and if your a giant PuSsIE like me, im pretty good with flat n stable.

Another source of increased tension is from packing. Some of those rigs were also packed by intentionally tucking the top of the bridle in all the way to the flap. By pulling a little bit out you can mitigate this issue. That is why some bridles have Velcro that you are supposed to mate on the bridle. It makes leaving a bit of bridle out part of the closing process.

The main purpose of the velcro on the bridle above (read: closer to the canopy attachment point) the top pin is to prevent pin/container lock. The velcro ensures that there is slack/bridle length between the top pin and where the bridle tucks beneath the side flaps, so the top pin can be pulled and not hung up with bridle tension passing the pin attachment point.

Another solution is to route your bridle between the grommets when closing the container.

I would guess that the amount of pin tension added by any length of bridle tucked under the top of the side flaps while closing the container is negligable compared to packing style and closing loop length.

Plus the flap is upside-down. Nice soft cock by the way ;)
~981

That's one of the nice things about velcro rigs. You can close the rig with the flap intentionally upside-down, if you want.

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Single Pin container system & pack job changes will influence pull tensions .
Also dont forget that on Double Pin container system & pack job filling the container volume .
After the 1st Pin is popped . Tension needed to pull the 2nd Pin . (can also be) influenced by the popping of the 1st Pin with moving the way/shape of volume filling the tray is filled and packed to increase 2nd Pin pull tension .
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That's why on low stuff, unless you are trying to look cool, velcro is the way to go. You can swap canopies that might be larger or smaller and the pull force will be the same.

All other things being equal I think it comes down to consistency.
Pin rigs will offer consistent pull forces throughout the life of the bridle where as velcro wears out over time, can be primed to simulate the velcro being worn out and can be stored where it mashes the hook and pile together possibly making more secure.
I own two velcro rigs and love them but I don't jump (haven't jumped ;)) lower than 220' and probably wouldn't free fall lower than 250'.
Remember when velcro was gay like 3-4 years ago? I think it's coming back.