new bollard/winch for rigging?

[Tony Croft aka hamadryad]

I dont like spending my days on spikes ringing down, I guess I will have to take everyones word for it and test the thing out in the safe zone!

 

hardcore style

[Rupe]

I have had my big rope through that pulley to a leaning pop and a 7.5ton loaded truck whell spinning pulling the tree back into the woodland via the pulley, my rope is a known quantity 7 kn sounds low to me. or maybve im being thick?

 

A large rope of 19mm would have a MBS of 9000kgs. and if you use a 7:1 (fine for rigging) that gives SWL of around 1250kgs. So your 7.5t truck might have exceeded the SWL but as long as you applied the force progressivley you would have a job to snap the rope, and the pulley of course is going to be fine.

[Rupe]

The whole point of these fancy bollards is to be able to dissipate forces through proper use. So we all know the figures, a 200kgs lump falling 2m creates a force of a gaziliion kgs when it comes to a stop. Well thats all well and good but if you bring it to stop slowly those forces are lost.

 

I still think the 700gs sounds low, but thats SWL at 10:1 so its as low as can be. 1000kgs is more like it plenty IMO. A 500kg lump lowered by a competant groundie will not generate that much force, but the higher up it is the mpre time he has to slow it down.

 

Tony if you are looking for the ideal lowering system then the proven one thus far is the grcs, and if you need a fixed bollard then a cimple RC device on the same tree will do, plus then you have the ability to put the bollard on a seperate tree or to have another crew usign that elsewhere.

[Tony Croft aka hamadryad]

I want the winch facility because sometimes you want the groundie to pull back to raise a low one, you know the scene put a gob in top of the limb cut the back as they haul up and it then can be lowered butt first neat and no agro

[gibbon]

I want the winch facility because sometimes you want the groundie to pull back to raise a low one, you know the scene put a gob in top of the limb cut the back as they haul up and it then can be lowered butt first neat and no agro

 

Which ever one you chose they both have the same winch. As soon as you get used to rigging up as well ad down you will wander how you managed for so long without one.

[Stephen Blair]

I want the winch facility because sometimes you want the groundie to pull back to raise a low one, you know the scene put a gob in top of the limb cut the back as they haul up and it then can be lowered butt first neat and no agro

 

Get a younger climber and a stronger Groundie Tony

A winch would be great when dismantling over stuff.

[Tony Croft aka hamadryad]

Which ever one you chose they both have the same winch. As soon as you get used to rigging up as well ad down you will wander how you managed for so long without one.

 

I manage by A) having three men on the ground B) cutting smaller so one man can pull back.

 

but the winch will sort all that, sounds like the \grcs needs looking at before the buying takes place to me. especialy as the other comes with a compulsary 400 quid training day (no bad thing IMO)

[Paul Smith]

Which ever one you chose they both have the same winch. As soon as you get used to rigging up as well ad down you will wander how you managed for so long without one.

 

Totally agree! Love mine and so does everyone that uses it.

[Tony Croft aka hamadryad]

I think you guys need to cut mr ieblings some slack, it takes a lot of brain and business skill to bring a thing to market, lets not write it off just yet eh

[Old Mill Tree Care]

Hear hear Hama. I'm really interested too.