Field-testing of the Postioner

At the TCI Expo one of the new pieces of equipment on show was the Postioner. It's a mechanical lanyard-adjuster that'll work on lines from 11- 12,5mm, with or without steel-core, it's designed & developed by Hubert Kowalewski of the Lock-Jack fame.

The basic design is similar to that of a Rope-Guide (except with a different cam), it's basically half a Lock-Jack with a short wire-toggle insted of the release on the L.J. It's connected to your D-ring by means of a carabiner & a short metal connector. This gives you a very short & compact set-up, also the lanyard leaves the Positioner running fair, i.e. in the right direction.

I've been using a Positioner for a couple of weeks now & I can tell you, it's something else... The lanyard runs in & out very smoothly (no need for a minder pully), there's maybe a little bit more friction than on a hip-prussic (depending on your set-up), this is to ensure that the cam'll cinch down on the line every time. It also has to do with the certification process, that demands the device to hold something ridiculous like 500kg- which knot'd withstand that kind of loading ?!

One very interasting feature is the way the Positioner will releas under load... smooth as butter. This is a important safety-feature, try releasing a gibbs or a rope-man under tension- you'll have a hard time. So if something were to happen & you were left hanging unconscious in your lanyard, whoever was rescueing you would be able to do so, without having to cut the lanyard or the synthetic link if you were using a steel-core lanyard (& provided you had a synthetic link!).

Sooo.. if you move the positioner from the D-ring to your sliding D, you can easily use it as a second tie-in point or on a take-down you can cinch your lanyard up against the trunk.

I've found it to be a very light-weight & versatile piece of kit. It's easy to use & idiot-proof (well, more or less...duhh). Also, apart from the GriGri, and one or two other adjusters this one is actually designed & certified to be used for this application.

My feeling is, that this'll become a standard piece of climbing- equipment. The price tag should be similar to that of a micro-cender (give or take some). They should be available beginning of next year... if you can get hold of one, do so, enjoy it & become the target of everyone elses undisguised envy.
 
Mark B,
It seems to me that anyone who is fond of a microjuster or grillion would absolutely love this positioner. I did play with it at TCI and thought that it was very smooth. I like the ability to release it under load and feel that it is even lighter and more compact than the microjuster.

If the price is right, this may be the next big lanyard idea (or maybe even a mechanical friction hitch?). I'll look forward to trying it some more in the future!

Was`the positioner given a WLL rating or tensile strength yet?
 
Ohhh.. I'm teribbly sorry, Sergio, but my admittedly meagre computer savvy really comes to a grinding halt when it comes to getting pictures into here. Do I just hold the thing in front of my monitor?! Maybe try Hubert directly @ ART4TREES.com or .de (I'm not quite sure which).

As for your question, Mark, Rope-Guide (which is basically the same thing in terms of testing) is certified to min. 23kN , at this point the webbing sling failed. The connecting link on the positioner has been tested to 24kN.
The thing is, that a synthetic line would fail way before this point, so what's probably more relevant for us, is the fact that the certifying body demands the device to hold 500kg without slippage.
Mind you, as I mentioned before, that's a hell of a lot of weight- we're talking work-positioning & lanyard here!

I'm not sure the WLL really comes into this. It's an item of the PPE, not belaying or positioning equipment. So if you take the alpine safety (or design) factor of 20, going by the 23kN, you could weigh 115kG, that's a big arborist. To obtain CE certification, elements of the PPE have have appropriate safety margins, or else they won't be certified.

One small point I noticed, is that I got the dia. wrong: it's 12-13mm.
 
The easiest and least technical way to get a picture on your computer is to have your pictures put on a disc (floppy or CD, doesn't matter) when you have your film developed. Around here it costs an extra $8 for a 24 exp. roll of film. The disc will have the formatting program included so you just come home and pop the disc into your computer.
 

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