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"Double Friction" System
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hopperhopper


Mar 11, 2008, 10:03 PM
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"Double Friction" System
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I watched a buddy set up a primitive line using two carabiners to tighten it. He called it a double friction system. A few feet from the anchor biner he hitched a biner to the line, threaded the line through the anchor biner, then through the one he hitched in. Then, he threaded back through each one again, making another loop, but this time he went inside the pass he made the first time. Once this was done we got 2 or 3 guys to haul on the free tail and it held...I guess the friction forces kept it from slipping.

I hope I explained it well enough for everyone to know what I'm talking about. I've read tons of posts and done several searches but can't find anything about it. Like I said it's really similar to a 3:1 system, but only 2 biners, and the 2nd loop being inside the first. My question is, does anyone else do it this way? Maybe he just use a funny name for it? If nobody's with me I can make a highly precise, technical ms-paint blueprint and try to clear things up. Laugh Cheers!


NJSlacker


Mar 12, 2008, 4:17 AM
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Re: [hopperhopper] "Double Friction" System [In reply to]
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This is the only setup I use! If you have a few friends to help pull, and an extra 2 'biners for a multiplier, it's really quick and easy.

I've got to check out this 3:1 now...


dynosore


Mar 12, 2008, 5:36 AM
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I use this to tighten my zip line static rope. Also, for tying down kayaks, etc. on the car, you can just use a loop instead of attaching a 2nd biner. Similar to the link below:


http://animatedknots.com/...ww.animatedknots.com


richardvg03


Mar 12, 2008, 6:54 AM
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This rig is the only one I use as well... the more you wrap it the more it is... example wrap it 4 times it's a 4:1 system... and so on...


NJSlacker


Mar 12, 2008, 11:03 PM
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richardvg03 wrote:
This rig is the only one I use as well... the more you wrap it the more it is... example wrap it 4 times it's a 4:1 system... and so on...

I did not know that... so, when does the friction negate the MA?


areyoumydude


Mar 13, 2008, 9:56 AM
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Scott Balcom taught me that system. He learned it from Jeff Ellington.

We call it the Ellington tensioning system.

Scott Balcom has a book on slacklining (Walk The Line) with a lot of cool info. Check it out at slackdaddy.com


petsfed


Mar 13, 2008, 10:17 AM
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richardvg03 wrote:
This rig is the only one I use as well... the more you wrap it the more it is... example wrap it 4 times it's a 4:1 system... and so on...

Although after more than about 2 wraps, the friction gets huge and it is as difficult to pull tight as if there were no wraps at all. I use the Ellington system to hold the line tight while I reset my 6:1 (or 9:1, I'm not quite sure, its just a second z-drag stacked on the first) system that uses rope.


Partner slacklinejoe


Mar 13, 2008, 7:16 PM
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I highly suggest you guys look into piggy backing the system instead of just relooping it extra times. Search and rescue studies have proven the friction is far less when you get multiplication instead of addition going pulley wise. It does however complicate the system with requiring resets in many situations.

Pulley Friction & System Efficency Research by Oberon S&R


irregularpanda


Mar 13, 2008, 7:41 PM
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hopperhopper wrote:
I watched a buddy set up a primitive line using two carabiners to tighten it. He called it a double friction system. A few feet from the anchor biner he hitched a biner to the line, threaded the line through the anchor biner, then through the one he hitched in. Then, he threaded back through each one again, making another loop, but this time he went inside the pass he made the first time. Once this was done we got 2 or 3 guys to haul on the free tail and it held...I guess the friction forces kept it from slipping.

Sounds like the garda hitch... I wish you had pictures.


hopperhopper


Mar 13, 2008, 9:29 PM
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I don't have pictures. But...as promised, thanks to mspaint, I have supplied a state of the art diagram of the setup.


(click for higher resolution)

It's sort of like an inward spiral type thing. As you string it through the biners the 2nd pass, you go inside the first pass.


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