negative rigging of smallish timber

[karl1991]

Thanks, using a medium ISC swing cheek, steel krab. 2t sling, how big would you go? (Thinking of the lads below too )

[Steve Bullman]

if theres no hurry probably not a lot bigger than I would hand throw down

[Steve Bullman]

You certainly don't want them to take wraps around the trunk with that set up. Small pieces that they can comfortable let run a little by hand.

[Rich Rule]

I would cut it in sizes that are not going to hit the greenhouse. BUT I have a friction device.

 

As Steve said, go small enough for a large groundsman to control and slow down. Make sure they wear gloves. Personally, I wouldn't even worry about size the pulley and rope can take. The weakest link in the system you have described will be the groundsman's grip.

[karl1991]

Thanks for your help Steve, was worried about that with the pulley coming apart! I'd imagine shock loading one of those would be a disaster! It's a pig of a job, but a loyal customer who's hedges we have maintained for the last 3 years.

[Steve Bullman]

I would cut it in sizes that are not going to hit the greenhouse. BUT I have a friction device.

 

As Steve said, go small enough for a large groundsman to control and slow down. Make sure they wear gloves. Personally, I wouldn't even worry about size the pulley and rope can take. The weakest link in the system you have described will be the groundsman's grip.

 

I broke one of those tape slings years ago negative rigging a not overly large piece of lime as it happens....they won't take as much as you think.

[karl1991]

I would cut it in sizes that are not going to hit the greenhouse. BUT I have a friction device.

 

As Steve said, go small enough for a large groundsman to control and slow down. Make sure they wear gloves. Personally, I wouldn't even worry about size the pulley and rope can take. The weakest link in the system you have described will be the groundsman's grip.

We have a lad Ant for that! The gym lad! Always in his element at times like this.

[mistahbenn]

I would go admit as poss with that rigging gear.

[karl1991]

I broke one of those tape slings years ago negative rigging a not overly large piece of lime as it happens....they won't take as much as you think.

I'm going to use one of the round endless slings, but like you said, things don't take as much as you think

[Joe Newton]

Those pulleys are pretty flipping solid. I'd use a hefty piece of rope to attack the pulley/crab to the stem with. As well as being stronger than a tape sling, you can get the pulley right up to the stem to minimise shock loading. If the lad on the ground isn't using friction they you'll want as little drop as possible.

 

Don't forget that the forces involved are amplified by negative rigging, so even a 30kg piece is quite capable of sending your groundy flying.

 

Hard to say without seeing it but I would only rig if I absolutely had no alternative in your situation. I can fit stuff into some pretty tight spaces when needs must!