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I suppose a couple options would of been making the notch deeper or above the split. Not saying that would of fixed it as it was a severe side load.
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I agree with you. From where I sit the barberchair at that height was predictable because the sps Red Maple with a failed lead shows at the notch you where cutting into two beams of wood and not one.
A deeeper notch probabley wood of worked as well.
Also hard to read the lines and the angles of pull but potentially the pull line and retension line where off or imparted a twist to the tree. I think it always best to have the anchor as high as possible with the knot at that point rather than running it down to within reach. The reason being the compounding of forces at the crown TiP.
I am not perfect either and had something very similar many years ago with a large Sugar maple it was over 100' and I ahd two pull lines and wwedged centre of mass well over to the lay but missed an internal crack. I cut out the hinge.
Lines and wood rained down on me with two Snapped hydro poles and primaries,secondaries and home and biz feed lines and a major communction line all stretched and/or snapped.
No one or no equipment was hurt or damaged. Every one was safely out of the way, hydro was up and running by dark(awesome Hydro men to the rescue) and the tree actually fell perpenidicular to the intended lay between two homes with minor damage to an eavestrough and shrubbery.
How I survived is beyond me, totally unexpected but in hindsight it was a rookie mistake and mb have only been remedied if I had paid closer attention to the backcut saw chips and angle of the bar and not overestimated the wow in the rubber/spring vibration dampeners?
There is potential in tree of that nature the tree butt can kick out as well as barberchair and tree could be on top of the house.
Mb a good plan but unexpected is potentially a bad plan.
Cheers
Thanks to all the Veterans.