No slack

[DrewB]

totally bro. do you mean as a redi?

[Grasshopper]

what if you are walkin back onehanded or body trust up and you hitch wont grab....

that you have to shockload your hitch before it would grab...not really good idea tho...

[atree]

totally bro. do you mean as a redi?

 

Well was having a play with the o-rig with ross and adam yday and cos you cant retrive it through a cocoon when using the non spliced end,i was thinking using a normal setup but as a 2:1 system,so the second anchor point could be retrived,(if you have a look at the "conifer dismantle" in the guide to the canopy)??

 

Does that make sense?

 

So how would you do it for a redi?

[DrewB]

whip a small eye on the non spliced eye end of your rope bro and you can retrieve as normal. or just slide the webbing sling to the end and attach the retrieval ball in this-get what i mean?

[atree]

yeah man gotcha!

[DrewB]

What are they designed for originally? If you cant use them like that doesnt it make them pretty much useless?

 

Its now been decided that its totally ok to run off just one revolver:001_smile:

[DrewB]

it must take some load pete surely, and if it breaks and the sling moves away then how are you going to get it back without a lot of faffing about and if you were hanging then you are going to pretty stuck if you cant get your strop round the stem or branch

 

If it did break it would be real easy to retrieve the system-no faffing about. You would just push the rope away from you until the hitch climber descends back to you. is that what you meant bro?

[atree]

Its now been decided that its totally ok to run off just one revolver:001_smile:

 

Hows come?,wasnt the bend ratio to great?

[DrewB]

we measured it agaianst the treemotion ring and its virtually identical. And Thilo Beeker (Nordic Tree Care) was at the comp and has apparently done testing with DMM and it now classed as safe, still not as smooth as a biger pulley though but ideal for o rig.

[Chris Cowell]

Drew

 

Treemagineers tested a range of ropes in the 'O-Rig' format before describing the technique in the Hitch Climbers Guide to the Canopy. All tests used green DMM aluminium rings with a circular cross section of 12mm as an anchor at the 'climber' end of the system and a steel bollard of 110mm diameter at the other end . The lowest (static) breaking strength was 37kN which was recorded when the rope slid across the steel bollard and was cut when it crossed over a sharp edge/small bend radius.

 

For reference, the tread diameter of a DMM Revolver is 11mm. Whilst this small difference in diameter may seem insignificant, there will be occasions when test results show otherwise.

 

I have no doubt that on this occasion, the configured strength of an O-Rig with a locking Revolver will be sufficient, even with a small diameter climbing line. But Treemagineers have not tested this. Can I ask you to share with us the test data which allowed the NZTCC Technical Committee to allow this configuration following a period of reluctance?

 

Chris