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samhell
Jul 9, 2007, 6:55 AM
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I'm wondering about the 3:1 system.
I'm looking at this as reference.
http://www.wanderingphotographer.com/...ems/three-to-one.htm
Can I rig something like this without the Prusiks?
Can I clove hitch 2 Caribiners instead?
And could you add a fourth caribiner to the system for more advntage?
I searched ut couldn't find an answer..
Thanks.
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petsfed
Jul 9, 2007, 9:48 AM
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samhell wrote: I'm wondering about the 3:1 system. I'm looking at this as reference. http://www.wanderingphotographer.com/...ems/three-to-one.htm Can I rig something like this without the Prusiks? Can I clove hitch 2 Caribiners instead? And could you add a fourth caribiner to the system for more advntage? I searched ut couldn't find an answer.. Thanks.
Totally. On both questions. The prussiks just make it easier to move the pieces around.
As for adding a 4th biner, click the 9-1 system link at the top. Even shows you how.
Other options include putting a prussic and carabiner on the right side, on the lower of the two strands and feeding the rope through that after it goes through the carabiner on the left.
For additional advantage over and above that, put a prussik on the rope after it comes out of the carabiner on the left. Thread the rope through the crab on the prussik on the right, then bring it over to the prussik you just placed on the left. You'll pull less slack before the prussiks have to be moved, but it will be a lot less force at any given time.
Use pulleys for maximum effect.
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samhell
Jul 10, 2007, 7:07 AM
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Thanks!
This is a learning proccess every step of the way..
I went and bought a few things today.
I bought a couple more biners, & some extra webbing. Here is what I plan on doing. I'm going to avoid using the prusik method for now.
My plan is to use a small loop of webbing to attatach another biner to my 4:1 system, to separate the biners. I thkn this will work. But I have a question about tying off when I tension it,, (how?)(what knot? (overhand, hanlfhitches?)
Here a quick diamgram of wht I'm planning on setting up.
I'm only going to be setting it up around 25-30ft long, and and anchor points around 2 1/2 feet high,
I want it low for now while I'm learning..
EDIT* In the diagram, where I wrote clove hitch,
I meant Muenter.
(This post was edited by samhell on Jul 10, 2007, 7:59 AM)
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kr0g3r
Jul 13, 2007, 7:03 AM
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ok, i'm gonna go ahead and say that you are waaay over complicating things. all you really need to set a good tight line is some anchor webbing, slackline webbing, 2-4 biners, and some muscle.
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samhell
Jul 15, 2007, 10:42 PM
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kr0g3r,
Thanks, I know I'm overcomplicating things...
I'm still just rigging the 4:1 biner/webbing system..
And it works..
I just want to be able to set up a line with 2ft anchor points and a lin around 25-30 ft long....
I'm jsut getting too much resistance with this setup to successfully do it..
And tricks?
Thanks
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greenketch
Jul 15, 2007, 11:04 PM
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Tips? Get rid of the biners. If friction is your problem (almost for certain witha biner system) than pulleys are the answer. With a 4:1 biner system you are getting a somewhere between 2:1 and 3:1 in real advantage. The rest is spent in sliding the rope over the biners.
Of course there is always to sack up and pull harder. or to use a seperate 3:1 to pull on your existing system as was proposed already, or to change your system as was also suggested.
Another question is what type of webbing and gear are you using? It may be that you are trying something that won't work anyway.
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kr0g3r
Jul 15, 2007, 11:07 PM
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greenketch wrote: Of course there is always to sack up and pull harder.
best advice you can get on this subject.
also, dont use D's on your 4:1 use ovals instead, i have D's on mine and kick myself in the ass for buying them everytime i go to pull my line tighter.
(This post was edited by kr0g3r on Jul 15, 2007, 11:19 PM)
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slacker117
Jul 17, 2007, 9:18 PM
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Wait...Your having trouble getting it tight enough for a 30' line? The basic 3 carabiner friction method works just fine to get it tight enough, so much that it can become virtually no longer slack...I'm confused why you're going overboard with the pulleys and any additional biners for a short line
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petsfed
Jul 17, 2007, 10:29 PM
Post #9 of 11
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samhell wrote: I'm only going to be setting it up around 25-30ft long, and and anchor points around 2 1/2 feet high, I want it low for now while I'm learning.
This is why he wants it so tight. What I would suggest is to build a 3 biner system, then add your 4-1 system. Take a look at a 3 biner system (coldclimb has an article on it, as I recall) and set it up so your tightening apparatus is on the right when you look at your line. Now, starting at the anchor on the right side and moving left, you'll count one, two, three carabiners. Set up your 4-1 so it connects the first crab to the third crab. Now, with every good pull on the 4-1, pull the 3-biner system tight. This'll lock your system up real nice.
Alternately, set up the autoblock illustrated here and put your 4-1 between the two crabs that it requires.
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kr0g3r
Jul 18, 2007, 3:34 AM
Post #10 of 11
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slacker117 wrote: Wait...Your having trouble getting it tight enough for a 30' line? The basic 3 carabiner friction method works just fine to get it tight enough, so much that it can become virtually no longer slack...I'm confused why you're going overboard with the pulleys and any additional biners for a short line
maybe he is a little heavier than the average slacker...
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delrio
Aug 18, 2007, 9:45 AM
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Instead Prusik :
http://www.gudelius.de/fb1.htm
FB-Sling Friction Knot (example on steel cable)
(This post was edited by delrio on Sep 5, 2007, 8:07 PM)
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