The eyeball trick works if you have a plumb line to help you actually see what's level a loosely held ax does a wonderful job. That way you have a vertical reference point, and trunk lean, hills, etc are easily noticed. You have to supply enough force to torque the tree over, and so the higher...
The wood fibers run vertically, and since you can look straight down and see nothing but saw cut, you can see you completely cut the hinge off. If you use stump shot on anything, you need to take in account of the material being undercut below you. You basically turned your notch into a snap...
Or at least get someone to learn from. There is virtually no room for friggin' up and living to tell the story in this line of work, and being self taught makes it even harder and closer to the edge. Virtually nothing you did there was correct, and you hit powerlines and a propane tank. You were...
The same calculations are used for figuring the cog for critical crane pics and rigging, as apprentices we were taught that stuff and more. That's what rigging is in the construction world.
When you are pulling a tree, or using wedges for that matter, you are applying a force, which is actually called torque. Torque is measured in the us as foot pounds, and the equation is torque = distance x force. If you double the distance the hinge to the pulling point, you double the force...
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