When craning vertical wood, 95% of the time, I prefer one cut. I start my cut directly below the choke point, as a plumb bobs, and cut straight through. When the crane applies pressure, the kerf will automatically open up. Thus no wedges or opposing cuts are needed. And, as most cranes have a load scale, I'll tell the operator how much pressure to apply, and if my weight estimates are close, the piece will pop off gently. This last fine tune procedure I learned from wiley_p. But we are finding that butt logs can weigh 20-25% more than normal wood weights.
John, you don't want ANY holding wood, wood fibers are too strong to be easily broken in a straight up pull mode. No unexpected strain on the crain!
or noggin..as in cranium!
We're putting together a bid on a 5-6 foot redwood that is 102 feet from where the crane center pin will be. Sounds like we'll need a 210 ton crane, about 130 tons bigger than I've ever used....takes two semis to bring in the counterweights! So min charge about $3000!