Wow, that thing was a disaster waiting to happen. Good thing nobody sneezed on it!
i had known for some time that cherry was in trouble. the woodpeckers were at it pretty good last fall, and they don't hammer on hardwood because they are bored. there were quite a few branches though that had fair amount of green leaves, and that led to some overconfidence on my part.
i started in on a conventional notch, pretty high i might add because there was a good size "check" right where i was going to make the back cut -- i didn't want that to split off and possibly barber chair a nasty chunk at me. so i tapped the chain on the back side above where the check was (you can see the mark in one of my pics above) and first cut the notch angle above that. the saw went into the cherry WAY too easy and that was my first clue. i cut the horizontal part of the notch next and by then big black carpenter ants were streaming out of the kerf. my cuts met and i pushed the wedge out of the tree. AHAHHHHHAHAHAHAH was my first thought -- there was at best 1.5" to 2" of solid wood around the perimeter, the rest was mushy dust.
i knew at this point it was a hazardous situation, since the tree could go any direction it wanted at any time and i had just cut a third of the wood away on one side. fortunately there was already a lean and most of the weight was headed the direction i wanted it to go. but all the warning signs were there and i told my on-location staff photographer aka my wife that this whole situation was dicey as heck so keep a wide berth from what i'm doing.
i carefully started the backside cut and only went in about the depth of the bar plus a bit. all that was really coming from the chain out was mushy garbage along with a smattering of actual wood chips. there was some noise from the tree and i yanked the saw out, shoving a 8" wedge into the backside kerf. at this point this was far from an ideal, controlled fell, and i didn't like it one bit. i took the hammer and whacked the wedge a few times, soliciting more noise from the cherry. there were ants everywhere now, just streaming out from all my entry points. in my mind i could visualize that there was in fact no holding wood at the hinge (what hinge?) -- all that was keeping this tree vertical was a bit of perimeter wood, as if i had plunge cut the backside. so i decided to treat it like that, gently and carefully cutting into a little bit more of the perimeter. more unwanted noise.
i set the saw aside, took another wedge, placed it about 30 degrees from the other, hit it 4 or 5 times, and the tree creaked, groaned, and then fell over pretty much where i had wanted it to in the first place. not a really fun fell though -- more that a few times i stepped back and re-warned myself that this was not a good situation.