Assisted pulling technique?

[adamkaye123]

Hi guys I just finished my cs41 and when I was on it the trainer showed me away of pulling over stems using:

A line tied to the top of the tree then tied off on a capstan then the bit I don't remember too well but consisted of 2 double pulleys an old climbing line and a big rope grab...

I remember the rope grab goes on the rigging line and one of the pulleys clips on to the capstan has anyone used this method and could perhaps show some pics so I can make my own kit up?! Thanks

[TIMON]

Used something similar today to pull a back leaning stem over. Pull line tied to the top of the stem, then a pulley tied to the base of a nearby tree in the direction of fall. The pull line goes through the pulley and back up on itself to another pulley tied (by prussic and carabiner) halfway back towards the stem. Feed the end of the pull line through that pulley to give you 3 to 1 mechanical advantage. The prussic can be pushed further back up the line as the system shortens on itself. (If anyone can understand that I'll be amazed!)

I'll try and put some pics up tomorrow.

[Thesnarlingbadger]

It sounds like a 3to1 set up kind of thing. Not sure if this is what your on about. Will try and get some pics. I use it to pull trees over when there's not enough guys on the deck to do it by themselves.

In a rigging situation it would effectively be the same principles just adding the capstan to avoid the top falling to the deck.

Does this sound like the kind of thing you were on about?

[Thesnarlingbadger]

Used something similar today to pull a back leaning stem over. Pull line tied to the top of the stem, then a pulley tied to the base of a nearby tree in the direction of fall. The pull line goes through the pulley and back up on itself to another pulley tied (by prussic and carabiner) halfway back towards the stem. Feed the end of the pull line through that pulley to give you 3 to 1 mechanical advantage. The prussic can be pushed further back up the line as the system shortens on itself. (If anyone can understand that I'll be amazed!)

I'll try and put some pics up tomorrow.

 

 

I understood haha

[scotspine1]

good explanation here but without the port a wrap

 

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[Marc Lewis]

good explanation here but without the port a wrap

 

 

 

 

This system is often used/shown on ua2.2. A very handy system to know.

[R Mac]

Is this what you mean?

 

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What I do once I've got the tension where I want it and the priussik is holding the rigging line is to slide the moving pulley down to create slack on the working end, tie and alpine butterfly on the working end and clip in a carabiner before sliding the moving pulley back up the rigging line until it holds on the alpine butterfly/carabiner. Now the load is held on the rigging line and can't slip rather than being held on the progress capture prussik.

Edited April 12, 2016 by R Mac

[adamkaye123]

This system is often used/shown on ua2.2. A very handy system to know.

 

 

That's the same 5:1 set up but instead the the end pulley was attached to the rigging line it wasn't all utilising the same rope

[drinksloe]

Quite clever, 1st time i've seen that sort off thing.

 

In pracitce is it not easier just to have a hand winch/or tirfor in van?

I'd be worried that even with the increased load it was still not enough to pull the tree over and then u've no where to go

[Jimbo 76]

The 5:1 system is now part of the assisted felling ticket. We used the stien system comes fully made up and ready to use. Basically on smaller diameter wood where it saves getting winch out. Other half of ticket is with winches.

 

Cheers,

James.