Rigging Whole Trees With the GRCS

Great video Nick and what a contribution it is to put that out. Had been intending to lift a limb on a take down tree with a remotely installed XRR but ran into a hiccup installing it. As a result of seeing this vid. I used a block on a line. Saved 20 or 30 min. of fighting with that in the tree - thanks.

Used my pick up this time but my interest in a GRCS is greatly renewed.

Previously you had encouraged questions about your video. I have a ques. about 4x the rigging force. Would you like that on YouTube or here? Thanks again, I love learning more and working smarter.
 
Ok...I'm gonna play the part of the xman here. 'You could have installed blocks from the ground using an X-rigging sling and block; bringing the compound force on the rigging point from 4x to 2x. Also retrievable AND you would be helping Treestuff sell a new product. Your killin me Smalls!'
 
tennarbor you made me laugh.

Nick do you mind telling me what makes the rigging forces pop up to 4x in your video set. (What would I be able to look at and count it out on my fingers what it goes up to?)
And now I’m wondering what about an XRR/block combo set would drop it back down to 2x? I’ll go back and look at that video again.
 
Merle, I'm not either of those guys, however I can answer your question.

When you hang a block say tied directly to a tree with a sling, and run a rope through it each leg of the rope sees 100% of the load. Ie. If you have a 100 lb log on one end it would take 100 lbs of force to lift it. The rigging point sees both those forces, 200 lbs or 2x the load.

When you hang a block as Nick displayed in the video the branch he had the rope over with the block and bowling acts like a pulley. Now since the block itself is seeing 200 lbs and it takes 200lbs to hold it from the other end of the rope the branch union and rigging point tree see 400lbs or 4x load.

Does that make sense? I'm sorry that I have no fancy diagrams I'm writing from a phone..
 
Thanks so much Evan, that makes sense and I should be able to understand it (I do kind of) but I can’t see it. I Googled “rigging forces” (an amazing amount comes up in connection with arb stuff). Looked at the HSC(?) info listed in a knot breaking strength thread. And then went and re-looked at the TCIA Best Rigging booklet.

I think I finally see it in the TCIA info.. If I counted the legs of rope that are carrying load, thats the no. to multiply by right? (Nicks set up 4 lines holding load and lifting load.)

Thanks again for taking the time to answer.
 
Your welcome Merle,

I get to a certain point like compound mechanical advantage systems(block and tackle) and I have trouble counting mechanical advantage too. I haven't really applied myself to understanding them yet.

Its a pleasure Merle.
 
A few years ago (with the help of a few buzzers) I developed a short video of a way to calculate rigging forces on a diagram. It is based on a method shown to me by Bruce Smith of On Rope 1

Here is a link to a preview of it on Prezi:
http://prezi.com/rf_aj86grcgs/?utm_campaign=share&utm_medium=copy

If you want the see the whole thing, go to The Gravitational Anarchy Blog, fill out the contact form and I will send you a link.

If you are already following the blog, you should have received an e mail with the link already.

Tony
 
I have used a leather tube cambium saver with good success hanging trees. Easy to install, easy to uninstall. No damage to rope or tree. Haven't burned through one yet.
 
Tony, that was a great clip. It moves along slow enough for me to catch everything (since I advance it one thought added at a time). Ha! Am following the blog, or had signed up, but have never seen the link. Will go and check again.

Many thanks, Merle
 
[ QUOTE ]
I have used a leather tube cambium saver with good success hanging trees. Easy to install, easy to uninstall. No damage to rope or tree. Haven't burned through one yet.

[/ QUOTE ]

I have!

jomoco
grin.gif
 
[ QUOTE ]
A few years ago (with the help of a few buzzers) I developed a short video of a way to calculate rigging forces on a diagram. It is based on a method shown to me by Bruce Smith of On Rope 1

Here is a link to a preview of it on Prezi:
http://prezi.com/rf_aj86grcgs/?utm_campaign=share&utm_medium=copy

If you want the see the whole thing, go to The Gravitational Anarchy Blog, fill out the contact form and I will send you a link.

If you are already following the blog, you should have received an e mail with the link already.

Tony

[/ QUOTE ]

Tony, your blog just keeps getting better and better. Thanks for all your work bro!
 
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