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Climbing Disciplines:
Slacklining:
Re: [majid_sabet] Your turn:
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slacklinejoe
Aug 7, 2007, 11:52 PM
Views: 7549
Registered: Nov 5, 2003
Posts: 1423
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majid_sabet wrote: Joe I know the biner system, I am talking about the new toy on the image above the biner photo. What is that thing ?
If you meant the next to last photo why didn't you say so? 
You could ask us on a web forum or you could bother to read the page itself since it clearly says that the item is.
That photo shows the slackjack which is the other system I mentioned. It encorporates bronze rollers in a 6:1 configuration. Unfortunately, I don't have the effective MA that takes real world efficency into the equation. I do know a lot of people end up using a 2:1 on the end of it to work as a multiplier which implies it's level of effectiveness as higher than the 3:1 primitive but no where near an actual 6:1, however without testing it myself I can't say.
In itself it's a simple enough idea and it should be more efficent than most biner based systems. From most studies I've seen on the effect of sheave diameter however the effects of friction should be quite high on such small rollers. But it's all a trade off. It's relatively compact and should provide greater MA than biners only so it's probably a better solution than the typically rigged biner based systems but it's up to the end user to decide if it's worth the cash when there are certainly other methods that offer a higher real MA.
Edit: after going over the page againit seems the slackjack has an effective MA of 1.88:1 which is very close to what I guess it should be. It's got a lot of friction going on and is only 0.58:1 better than the 3:1 primitive setup. Larger sheaves would improve it's advantage but would likely cause a higher price due to the increased tooling as well as add weight.
(This post was edited by slacklinejoe on Aug 7, 2007, 11:57 PM)
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Edit Log:
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Post edited by slacklinejoe
() on Aug 7, 2007, 11:53 PM
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Post edited by slacklinejoe
() on Aug 7, 2007, 11:57 PM
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