I hope Gerry might offer his opinion. If I read his book correctly, the heavy limb cut with the undercut or small face he calls, “improved jump cut.” I don’t think he called it a coos bay. I sometimes have lumped the two together in my mind incorrectly.
Just saw a recent August Hunicke video that included a nice discussion and demonstration of a coos bay or improved jump cut used on a heavy limb. I thought how well this fits the Treehouse discussion. He starts explaining the risks and the plan to mitigate 14:00-15:23. Then we have a brief...
Lot of comments on the Instagram about the inexperience of the chainsaw operator, the retreat almost straight back, lack of face cut, should have bore cut. (Not sure this tree was big enough to bore?) No commenter said Coos Bay cut or chain the trunk.
I think you need an Instagram account to watch this. It gives me the chills because the tree looks small enough to seem harmless to an inexperienced person like me. My brother-in-law was going to cut down a heavy leaner this size and I talked him into hiring an arborist based on Jerry’s book.
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