Twin rope snatching

[munkymadman]

I saw one of reg’s videos with two pulleys two ropes and the seperate bollards for snatching. A 16mm line was snapped in the past. So could this be avoided by doubling up. Rope on rope is a no no, but if they’re running at the same speed can they both go off the same bollard. I’m assuming that would be a disaster. We have a couple of grcs’s and a number of flying capstans. Any configuration ideas that doesn’t involve buying a double bollard?

[David Dobedoe]

I think running two ropes of one bollard is not a good idea. Much to much chance of the ropes rubbing against each other under load.

 

I have used two separate bollard type devices on the odd occasion I needed two ropes on the same section of wood and there are two bollard lowering devices available.

 

I have seen some massive pieces caught on a one pulley system. It's really important that with big loads the rope is allowed to run. 

 

It is also important to estimate the loads involved and not go mad!

 

 

[Darrin Turnbull]

How about this method 

 

[chopper brown]

That looks a good way to smash your pulley up! 

[David Dobedoe]

That two pulley system is interesting but I can see how pulleys may get knocked about. Perhaps 'rigging rings' would be better than pulleys in that application?

[carlos]

have you looked at yale polydyne ropes, the 16mm one  has a breaking strain of about 8000kg!

hope your keeping well.

[munkymadman]

I’ve used two bollards a fair bit for doing large limbs or double rigging. But on a spar it would have to be identical otherwise it would favour one rope over the other. I like the M rig snatching idea. But I reckon your right that maybe a ring would be better than a pulley. I guess I’m considering those times when it gets low and fat without much room to let it run. 

Afraid I haven’t got the luxury of choosing which ropes the company buys. Hope your well too Carl. I’ve just arrived home

 

[john meehan]

I saw one of reg’s videos with two pulleys two ropes and the seperate bollards for snatching. A 16mm line was snapped in the past. So could this be avoided by doubling up. Rope on rope is a no no, but if they’re running at the same speed can they both go off the same bollard. I’m assuming that would be a disaster. We have a couple of grcs’s and a number of flying capstans. Any configuration ideas that doesn’t involve buying a double bollard?

Put a block on your piece you are rigging as well, this increases the rope in the system drastically and creates a 2-1 system, works really good especially on dodgy trees as it reduces shock loads.

Climbing arborist on YouTube has a good video about it.

[Treerover]

I saw one of reg’s videos with two pulleys two ropes and the seperate bollards for snatching. A 16mm line was snapped in the past. So could this be avoided by doubling up. Rope on rope is a no no, but if they’re running at the same speed can they both go off the same bollard. I’m assuming that would be a disaster. We have a couple of grcs’s and a number of flying capstans. Any configuration ideas that doesn’t involve buying a double bollard?

woah woh woaaaaahhhhh......you broke a 16 mm double braid lowering rope?? Jesus, that takes a chunk. Have you considered knocking them out a smidge smaller ?? [emoji12]

[Pete Mctree]

11 minutes ago, Treerover said:

woah woh woaaaaahhhhh......you broke a 16 mm double braid lowering rope?? Jesus, that takes a chunk. Have you considered knocking them out a smidge smaller ??

Easier done than you imagine - a decent lump of beech & a numb groundie & your breaking shit.