Adjustable Bridge For Treemotion

[TIMON]

Just fitted this to my TM. It's a Ropeman mini rope grab fitted to the outside of the lower D's. I've used a mini spring gate connector to hold it in place. Saves tying and untying knots in the rope bridge. 👍

 

 

 

[Old Mill Tree Care]

That's a good way of keeping it simple.

Why do you want an adjustable bridge? What friction device(s) are you using?

[TIMON]

I'm on a zig zag. Adjustable so it's long for open canopy climbing and shortened for blocking down close to the stem.

[silky fox]

Very neat Timon.

[MattyF]

Nice I used to use a rope man on my side strop, one thing to bear in mind and why I stopped using it was it was found on drop tests it would cut through a rope! I think that would make me feel very uncomfortable having it on my main line now.

[TIMON]

Nice I used to use a rope man on my side strop, one thing to bear in mind and why I stopped using it was it was found on drop tests it would cut through a rope! I think that would make me feel very uncomfortable having it on my main line now.

 

 

Ouch! That could be nasty. Do you have any links or details of the tests? It'd help my piece of mind to know what kind of forces and weights were at play. I know that they can disintegrate if you use them on a 13mm rope.

Thanks 👍

[MattyF]

Copied from another link that I posted years ago from arb talk .... sorry I forget the source , it was probably the tree buzz forum though.

 

The Ropeman fell from grace with tree climbers following a number of tests conducted by concerned safety authorities, the HSE in England in particular. Ideally a 'rope clamp', like a prussic knot, should slide on the rope when somewhere between 2.5 kN and 6 kN of static force is applied - the Ropeman didn't slip at all and severed the rope sheath completely at 4 kN. (See table below - Ropeman HSE Review available for download here - full HSE Report here). Not an encouraging test result for Wild Country!

 

 

It's thought the Ropeman's sheath severing ability is due to the aggressive horizontal tooth pattern on the cam and the way the cam utilizes the relatively thin bar of the carabiner as a base for the cam when its under load. To be fair, Wild Country responded to these concerns and developed the Ropeman II which is a significant improvement over the Ropeman I on thinner diameter ropes - 8.5-11mm.

[MattyF]

http://arbtalk.co.uk/forum/climbers-talk/23156-wild-country-rope-man-2-a.html

Original thread.

Take a look at august hunickes YouTube channel as he's put done a lot of experimenting with adjustable bridges for his new harness .. its a very grey area though in terms of finding a suitable adjuster I still don't think there is one but possibly A kong duck or ropeman mk3 may be a better option as 4kn is not a lot!

[jrose]

Looks like a good idea, one thing I would keep an eye on is the metal of the ropeman rubbing on the green D, not sure what metal the ropeman is made of but it looks like you could get wear there when loaded and twisting about?

[Haironyourchest]

Couldn't the bridge just be tied off on the other side of the D ? Maybe with a mini Rigging plate or something to keep the knot from getting too tight.