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I do take that in consideration RB.. and I will also use a supporting tie to the stem (backguy) from else where when I feel it is a must. That is my biggest fear in a tree, the damn thing falling over with me tied to it. When Carl asked me about heavier loads, I neglected to figure in the side...

If our company keeps expanding in the tree work dept. as progressively as we have been, I would definitely consider dropping the money on a GRCS. I would also have to see I would need it for the trees we do here. More often than not, I can say a GRCS was not needed on the job thus far. I would...

Se far we have only used the base of a tree nearby for the porty at (A). But we figure we could rig something else if necessary. Loop runners and biners set this up fast, yes it is a quick shortcut. I have only dropped probably close to 300# at present on this and would have to look at getting...

It actually is a simplification to a problem. If you look close, you can actually save a line. On a zip line, often you would run a second line to the pulley for a controlled lowering down the zip line. This is actually using the existing zip line for both... It does however change the zip line...

OK.. Rob has drawn a better picture with explanation of this concept... See if I can get this posted....

Rob and I are estimating, that if you ( as the groundie) pull the piece cut over as it is hinging, it should fall less to the rope and thus reduce the shock. Then it is lowered down the tensioned line only away from the tree and then down at the same time. I really think the shock load is...

Rock on brother ;)

:lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol: You implying something MB? LMAO

Also I would add that at the base of the zip anchor (A) is your lowering/friction devise. Thus you would feed the line out at that point to the entire rig. The anchor point on the lowered object would then not only follow the downward line, but also lower the other point (c) on the lowered...

Guess pics are in order on the next job we use it.. Would make for a better run of it. :)

Rob understands more working physics than I do... He really helps get the job done when I am up in the wood... I would be lost with out him. :) Give that man a lever and a fulcrum and I bet he could move anything with just tenacity. :D

You should have hear this conversation when he first came up with it while I was up the tree... YOU WANT ME TO WHAT?????!!!! HUH!??? Was funny!

TY Rob .. heck he came up with this.. Welcome to the Tree house Brother :)

You use blocks and appropriate rated bull line as you would with a straight drop and lower.. And like I said .. let the line run a bit to lessen the shock load. And no I don't often use this on 1000# loads. More like 3-500#... But with the right line and groundie I think you could.

Like I said simple is better if you don't have something right below the tree... And like I said ... the groundsman can pull the wood away from the cut.

It also allows the grounds man to pull the wood towards him... And he can let the line run with the porty or gcrs to lower the shock load.

I guess I could also explain that you are using the zip line for the actual lowering if you look at the points... Eliminating a lowering/retrieval line in the process...

No.. cause you rerouted the free to zip using the same line to lower... Thus lowering at a declined angle... Not to the actual anchor. Make sense... ???

Same here...When some thing at the base of the tree prevents it etc. I have had to do this over flag stone walks.. Very brittle shat. Rob has drawn it some .. let me know how it comes out :) Also if you can't zip it.. have to stop it part way but don't need the running line on the pulley for...