Comments on: Strength of 3 men, for only $20

By: Connor

Connor — Tue, 19 Jul 2011 03:23:03 +0000

Thanks so much for your help on so many different slacklining topics. I was curious, do these pulleys actually undergo much force? If i’m understanding correctly, they basically only take the force of your pulling on them since the line locks every time you let go of the pulley. I just want to make sure I don’t purchase pulleys that are too weak. Thanks so much.

-Connor

ANSWER: This particular setup, no, the pulleys undergo minimal force (approx 1KN, they are rated for 10-20KN). Your understanding is correct. Any climbing pulley should be sufficiently strong.

By: Jacky

Jacky — Tue, 28 Jun 2011 04:33:29 +0000

So say if I only have one pulley, can I possibly tie off the cord to the pole and thread the cord through the pulley on the line, and setup the rest of the system the same and have a 2:1 multiplier on hand, instead of your 3:1?

EDIT: you can, but it won’t be very efficient. Unless you use a 3″ pulley (more efficient, especially ball-bearing ones), I doubt it would add any overall benefit to the system. I can test this with a dynomometer to be sure, if you want.

By: jerry

jerry — Sun, 28 Nov 2010 01:06:53 +0000

How do you attach the petzl plastic pulleys to the system? Also, would you advise against using them for any particular reason? Thanks in advance for your help. This website is awesome by the way.

EDIT: I don’t like the Petzl plastic pulleys as the cord tends to slip off of them, but they work if you are careful.

By: Frankie

Frankie — Thu, 26 Aug 2010 03:26:19 +0000

You should mention that you don’t need the pulleys and the extra rope to make this multiplier. Especially with shorter lengths you just need 2 extra biners and some extra webbing to do the same exact thing.

EDIT: this is true. Not as efficient, but it does work. I’ll do a video comparing both soon!

By: Chase

Chase — Sun, 25 Jul 2010 01:00:26 +0000

I didn’t quite follow this to begin with. But when I read it a third time, it all added up in my mind. Thanks for the insight. Definitely something to think about. Thanks for sharing…

By: Michael

Michael — Mon, 04 Jan 2010 16:55:35 +0000

How do you tie off the line with this setup? Do you just tie the tail end of the main line in between the 3 carabiner cam system? Furthermore, what is the max line length that this set up can be safely used for?

EDIT: you can take the pulleys out and tie the tail off like normal (I do a few wraps and then tie a hitch), or leave the pulleys in and tie the cord off (same deal). I would say you could easily rig up to 70-80ft by yourself. Anything beyond that will be tough as I usually need more than 3 people to pull tight an 80+ft line (and this pulley setup is really just multiplying your strength by 2-3x).