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samhell
Jul 8, 2007, 8:53 AM
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I want to get some rope to use for tightening instead of the webbing, for less friction.
I'm just curious what diameter (mm) I should use.
Thanks for any help.
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summerprophet
Jul 8, 2007, 6:20 PM
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Anything 6mm or larger will be sufficient. 8mm static would be best. Rope does tend to have more stretch than webbing though, so the process of stretching and re-tightening will take a little bit longer.
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samhell
Jul 9, 2007, 12:16 AM
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Thank you..
I just went and picked up 30 feet of 8mm Static rope.
What would be the best know to attach it to the biners?
And do I still just use a clove hitch on the biners from the slackline itself?
thanks
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summerprophet
Jul 9, 2007, 12:29 AM
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Sam,
I have slacklined a bit, but my advice comes from predominantly rigging / rescue background.
With that said, the slackline ties remain the same, I would use your static line as a block and tackle between the two carabiners and finish with multiple overhand knots wrapped over the entire block and tackle setup (snugged up against the carabiner).
If this makes no sense at all I can email you a photo.
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samhell
Jul 9, 2007, 12:48 AM
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Thansk man!
Here is a diagram of what I'm attempting to do.
I have questions about what to do at points 1, 2, 3.
I'm not sure what using the slackline as a block means.. I'm still learning as I go.
Thanks
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greenketch
Jul 9, 2007, 3:41 PM
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It looks to me that you are attempting a 3:1 tensioning system the same as is used with webbing. The locking feature of that only works because of the webbing. If you change it to rope first you will need to find a way to tie it off without loosing tension. second in order to take advantage of the rope you will need to find a way to seperate your biners and gear so that the rope is not pinched.
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greenketch
Jul 9, 2007, 5:56 PM
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Hey Samhell, Just an addendum to my last post. I looked at your other thread. It shows using a Z-pulley to tension and lock off. If this is actually what you are hoping to use the best input I can give is this.
For the prussick (especialy the one that holds the load or ratchet prussick) I would not go smaller than 6mm preferable 7mm. For a prussick to bite effectively it needs to be made of material that is 2-3mm smaller than the line (3mm will bite a little better). Thus you will need 8mm for the most economical, useable setup and 10mm or larger for the most bomber.
Now as a side note every bit of weight that is in the line changes the motion of your slackline. You may find it more desirable to use an entirely differant system and drop all that stuff out. I believe tht Coldclimb has a couple suggestions in his article.
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samhell
Jul 9, 2007, 6:35 PM
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Thanks for the info.
Which coldclimb article is it that you're referring to?
So if I'm using 8mm for tightening, would 6mm work for the prisk?
thanks
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greenketch
Jul 9, 2007, 6:53 PM
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8mm makes it a bit tricky. The best bite is from 3mm smaller. Thus for 8mm the prussicks should be between 5mm and 6mm however 5mm approaches not strong enough to be reliable in ultimate strength. To get the best bite with the smaller prussick I would go with 9mm as a tensioning rope (6mm smallest prussick + 3mm best difference = 9mm)
As to the article look at the menu bar at the top of this site.. Click on articles, then click on slackline, then choose coldclimbs article I think the title was "work smarter" or something like that.
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petsfed
Jul 9, 2007, 7:31 PM
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greenketch wrote: 8mm makes it a bit tricky. The best bite is from 3mm smaller. Thus for 8mm the prussicks should be between 5mm and 6mm however 5mm approaches not strong enough to be reliable in ultimate strength. To get the best bite with the smaller prussick I would go with 9mm as a tensioning rope (6mm smallest prussick + 3mm best difference = 9mm) As to the article look at the menu bar at the top of this site.. Click on articles, then click on slackline, then choose coldclimbs article I think the title was "work smarter" or something like that.
I don't know what its called exactly, but I've often used the slackline itself to tie-off, and then removed the tensioning system entirely once I got it tight enough. Hard to describe here. I think coldclimb has something on it in his article. So he does. Ellington system. Set that up, then throw on your static line system to really get the sucker tight. After every good pull, pull the ellington tight and readjust your system. With this system, I can get a 60 footer incredibly tight (like 3 feet high on either end and the center still sits about a foot of the ground when I'm on it) all by myself.
Another option is to tie clove hitches in the line in the static line in lieu of using prussiks. Less material, but fussier and not as efficient, since the knots have to tighten a lot more each time you adjust them.
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murph24
Jul 29, 2007, 2:05 AM
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samhell wrote: So if I'm using 8mm for tightening, would 6mm work for the prisk? thanks
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