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This technique has been used for supporting a climber as well as removing trees. You will need to have two other strong trees near the take down. By using a tie-in in each of the other trees and a horizontal highline you use this as a false crotch. One time I strung a doubled line from tree to tree. On the double line I hung a double sheave pulley for a sliding crotch. Use two locking gate biners to crotch your rope, this gives a larger radius and good friction.
If you rig the horizontal line taught and hang a load in the middle you can double the load on the anchors. Be careful!
You could substitute a crane for one or more of the trees. If you can rig from a crane you can probably use the crane to remove the tree.
When I bid on trees this difficult I jack up the price for the risk and skill. Most times I don't get the job. So it goes...There seems to be no lack of chest thumpers who do jobs just to brag about doing them. On Friday I came back to one of these jobs. Last summer a huge elm broke and layed into two other trees. I bid on the removal but couldn't do the job for a few days. The lady hired someone to do the job for $3,500. They ended up with two truck loads of debris, someone getting hurt, and LOTS of work. The job we did on Friday took two of us until just after lunch. Except for the butt cut on an arborvitae clump we used only pruning saws (Poulan25s!!!). The chipping only took half an hour. I got $560 for the job. I wonder who made more net $$$ at the end of the day? Less machinery, less manpower, less debris equals more money to me.
How much do you guys get for taking down these 120' hazard trees? Around here, Minneapolis, I make more money with my Felco #2s and my Fanno #13 than I do with my Husky 288XP and my old Partner P100. Is there really money in large removals?
Strong limbs and snug ropes,
Merry Brown Christmas!
Tom Dunlap