I know I’m late to the game. My understanding of a Coosbay is simply cutting the back cut in a semi circular manner leaving the holding wood to one side till last.
Modifications can include a Dutchman on one side of the hinge, or both sides (remember this is for head leaners going with the lean more or less). Or leaving a strap of holding wood so the curf cross section is looks like a T. Another is leaving a triangle, of holding wood that can be blasted through. One can also cut out the center gutting the hinge as show in the old stihl manuals.
The goal is to leave the least amount of holding wood to cut though BEFORE the tree has a chance to barber chair.
Cutting with a short bar, waiting standing around with a camera until the tree barber chairs IS not a coosbay, if it were the sawyer would be sure to gut enough out there wouldn’t be slow creaking nor need to nibble.
Your understanding is lacking... It's a pretty simple cut, unconventional, but simple. On a coos bay there is holding wood, but no actual hinge. "Dutchman on one or both sides of the hinge"... That's bad terminology at best...
My understanding of a Coosbay is simply cutting the back cut in a semi circular manner leaving the holding wood to one side till last.
That is not a coos bay... you must be thinking of another cut. Given that you don't seem to understand what a coos bay is, and I do: maybe... just maybe... when I say that I used a modified coos bay on that tree, you could take my word for it... Instead you spout complete nonsense... While I AM used to dealing with a bunch of dumbasses (there you go Sean) on these forums, you are typically not one of them.
Another is leaving a triangle, of holding wood that can be blasted through.
The goal is to leave the least amount of holding wood to cut though BEFORE the tree has a chance to barber chair.
If you are implying that the reason a coos bay works is becasue the speed of the final cut allows the faller to blow through the final cut before the tree can BC, you don't have a clue. That common mispercption is completely false... The guys over at the treehouse, who like to pat each other on the back for being the best fallers to ever walk the planet, got that one wrong too. They were none too happy when I pointed out they didn't know what they were talking about either.
ANd this video demonstrates just that.. it took 55 seconds from the time I stopped cutting until the the trunk split. When I stopped cutting that tree was ready to go.. would have taken no more than 5 seconds of cutting to trip the holding wood, without the BC. Might have have only taken one or two seconds more. So why did this one take 55 seconds to split? The way this cut performs is not about speed..
For those of you that aren't familair with the species, the white ash is by far the species most prone to BC in the mid-atlantic region. You can see that this one was a monster... but it's harder to tell from the video just how much lean she had. I would call that an extreme front leaner. If this was any other species, it would not have BCed: it would have taken the tree to the lay, before it BCed.
There are a lot of BCs on youtube. I have never seen another one that took more than a few seconds to split. Find one if you can. I'd bet my house that you can't find one that took 55 seconds.
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