History going on here. Back around '85 I think, Jerry topped a redwood in a big way. Theres a poster you may have seen titled "150' up, still 7' diameter". You may need to buy his other book too;)
Absolutely. Any time one side of the hinge lets go before the other, intentional or otherwise, the forces of gravity, wind, other trees, wood fiber and many other forces of nature take control.
Use it on the tension side of the hinge, isn't that clear? If you felling a tree 90 degrees to the head, one side of the hinge has tension, the other is under compression. The side with the German cut will hold longer.
I used it the other day to swing a small, leaning ash away from a pond, guys were scratching their head a bit but it went off perfectly. Just one side in this case
Some times. Usually the top and sides are done while bucking and anything else is caught by the knot bumper at the landing. Tree length will usually be done mechanically at the landing. I was suprised to see that first buck slab out and be left, pretty big top to just leave. Wonder what the cut...
The higher you are above it the better. I usually make a slightly deeper and narrow face to get the face to close early, this seems to carry the tree away from the stump a bit. And no gap, just tight corners
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