Re: \"why must I always explain\" Van Morrison
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Dan,
They have talked about the risks, barber chair, kick back, hinge peal, and the like. Have you been reading this thread? Or just trying to pick fights. The question is how are you managing those risks. I dont think you have answered that yet. I dont think this should be used to the extent that you use it. But thats not my problem. Ive taken a bit of heat from this, because people think I am trying to defend you... I AM NOT.
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I have read this entire thread carefully... This is the first time that someone has asked how to manage those risks..
There is a lot to think about here..
Barber chair is avoided by using a plunge cut, with a back release.. I also like to plunge if there is any defect in the base, so that the hinge can be made relatively thin, so that it breaks very easily after the face closes. If the hinge is too wide it, and holds when the face closes, as the climber continues to cut, until until the hinge is small enough and there is enough force to break the hinge. That is a bad scenario as this could put a lot of force on the defect at the base of the tree, with the top of the tree acting as a giant lever pulling on the base. So presetting the hinge is mandatory in many cases.. also I keep stump shot to a max of 1" in most cases for the same reason.. in certain species, stump shot will require a lot more pull force to get the piece moving, which loads the base. The plunge cut allows the faller to precisely set the height of the backcut...
In cases where I used a regular backcut, there was no pull until the hinge was exactly where I wanted it.. It takes some experience to know just how much cutting to do in either case (plunge or standard), and you have to know your different species and how the hinge acts. If you have a species that will rip at the corners you need to undercut the corners.
So you have to be able to plunge from the saddle, not easy when you first start trying, especially if not tied in above the cut.. standing on the hooks on a lanyard makes it difficult to plunge, so for example, on that first tulip, I plunged from both sides with a 16" bar, which is evident in the still pics of the stump... That is a lot easier than trying to plunge with a 20-24" bar..
The other thing that helps with a plunge is it allows the climber to finish the cut from a comfortable position on the back side of the spar... so the but can't come back on him.. which is just added security. THIS SHOULD NOT happen if a good cut is made..
Notch placement and width are important to control the piece to get it to land flat, when cutting low enough so that the but could bounce back if the piece over rotates and tips come down early. I AM OK with cutting a notch less than 1/3 depth, which can have some advantages...
Wide notch no good unless you want the tips down first as used on that pine. Tips came down first protecting the sidewalk.. Also no need for a humboldt unless the piece is going to catch another tree on the way down.. In which case its probably better to find another method. Top can be thrown forward by cutting the notch narrow enough so that the top is still moving forward more than downward at the release. This is often good, as the top will still be far enough forward so that even if the tips over-rotate and come down a little early and throw the butt back, it will still land well in front of the tree.
Last thing would be reliable control of pull line.. The pull line needs to be set up right and there needs to be good communication and trust with the ground crew. That pull has to be reliabe and really important that they don't pull early.. So you need to trust the ground crew and have the proper equipment to do the pulling.
That is all that comes to mind right now..
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Or you could climb a littler higher, have half the problems and risk and get the job done 5 min later than your original plan without having two drops of pee in your pants.
At least this is what I'm gathering from it all big guy