A couple of interesting biners

Tom, it's ISC who make the double pulley.

It's a piece of equipment that was developed with Treemagineers. Treemagineers is a project involving Chris Cowell, Beddes and myself, aiming to develop arborist equipment, techniques and concepts. We've got a number of projects we're working on at the moment.... we'll see how soon they come to fruition, I'll let you know as it develops!

The idea behind the double pulley was - as you say - to eliminate the fiddly middle plate, so enabling a faster and easier installation of the pulley. The space between the hole where you insert the attachment krab and the ropes is such that it's imossible for the line to cross over, so it stays on the correct part of the pulley.

It's small things like this that make a difference and it's why we feel it's necessary for practicing arborists to be involved and to give input into product R'n'D of products- hence Treemagineers.
 

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Rupe,

I don't know if your re de set up is your creation or not, but it is hard evidence that there are few 'new' ideas out there. I came up with a set up like that late last fall, first reaction..'i bet no one's thought of this' second reaction 'probably'. And you just proved it.
 
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Pink isn't a compliment to the designer really :) But if I didn't care enough about the gear to try to not loose it that wouldn't be right.
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It was pink. Caught red-handed.

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I recall the Donald Southerland character in the movie "Kelly's Heros" had some attachment with pink paint. Tom, you shy one Panzer tank?


Jim
 
i was wondering if the axle on the double pulley; was larger diameter than that of a single pulley; then if sheave was larger in same ratio.

i really like Rupe's retrieveable/ adjustable height pulley idea. i guess it would also increase the SWL of the line pulley load was hanging on. The rig being really a DdRT with the tender reversed and not always employed for lowering pulley. Giving 2 legs of support to loaded pulley as it would climber etc.; and giving single instead of double support loading, even though retrieveable.

Pulley would be adjustable up too for totally remote installation as well as retrieveal, if full time tender (or self tending hitch), was under prusik, like climber in DdRT. Then pulley could even be installed, adjusted up or down (even for seperate events) and finally removed all from ground etc.

Pretty slick toys! /forum/images/graemlins/applaudit.gif
 
Rupe, could your re-direct also serve as a substitute for the ART rope guide? It looks very similar. You could use a single pulley (and maybe a Petzl Swivel) instead of the double pulley? Couldn't also omit the pulley above the Prussik and just use the Swivel Snap. This would allow tighter cinching and also not expose the pulley to potential damage if the system was retrieved from the ground?

Thanks,
Jim
 
As I have it set up its not suitable for use as a rope guide. The method of removal simply involves pulling the prussik off the end of the split tail. You wouldn't want to be climbing anchored to just that. There are home made rope guides that are similar in that they use a prussik to cinch them up tight. Someone else was asking elsewhere how this could be done.

Our Dutch friends seem to have it mastered and there are some pics of them on the bUzz somewhere if someone could be so kind as to find them..

And yes, I agree the gold pully is not really necessary, it just works really smoothly.
 
Treespotter, nice. Could you list what parts you used? Being new, I not sure what's what. Did you get them from an arborist's supply, like sherrill?

Thanks,
Jim
 
Hallo Jim.

This is a copy of my reply to Tom on "webbing false crotches". The attached file is a PDF on how to install it from the grownd.

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This is the FC configuration we are using.
It's made of samson tenex cous it's flexible and it sets nice to the bark (if you use rope that is to stiff it wil eat into the bark in this config).
On one end of the tenex is an ART pulley, the ring is attached by a Dyneemaa sling using a prussic. At the other end is a little harp that you put onto the climbing line on the side were your prussic hitch is on your climbing line.

With this FC your friction is almost zero.
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Let the splicing be done by a professional, your life depends on it.
Over the splice above the pully you must put a shrink wrap (this keeps the splice nice and tight and it will flip the pulley more easily out of the ring).

If you start using the device:

Don't tie the frictionsaver in the tree with a to small end to the pulley, otherwise you will end up tieing the dyneemaa prussik onto the thick splice of the pulley end and the prussik wil start sliding.

Keep it safe

Wolter
 

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Wolter, thanks for taking time to answer my questions and for the cautions. Coupled with your pictures, I think I can make my own now. I was wondering about the shrink wrap; good idea.

Thanks again,
Jim
 
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...Let the splicing be done by a professional, your life depends on it...

Wolter

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I concur.

love
nick

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I disagree, You tie your own knots, why not learn how to splice? It just takes a little research on theory and methods and a little practice.

If you know how to splice, you can understand and recognize if there is a problem with a splice, be it yours or a pro's.

Dave
 
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If you know how to splice, you can understand and recognize if there is a problem with a splice, be it yours or a pro's.

Dave

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Yes Dave, If you know, but if you don't you'll end up 50 feet below abusing the dropzone.

I am not the one to say "by all means make your own splice and bet your life on it" if I don't know who is gonna read the thread.
 
Dave's right. I was just being silly.

A splice is just an eloborate knot. We trust someone to tie a clove hitch, and few here would hesitate to accurately describe a VT for the benefit of helping others. Why not take it a step further.

Just like any other equipment we use- you have to make sure you're using it right.

love
nick
 
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