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None of the crane companies here allow it. I've flown once way back when, and I've tied off to the hook once (about 20' off the ground). Later that day I got to fly, I had to hump the 120' up the pine to set the first sling. That was a bitch. They say that either OSHA/owner/insurance doesn't...

They don't let you fly here, seriously blows.

From the charts I made a few years back. Mark C has been using them for a couple years with good accuracy. Diameter, then 2/4/6/8' lengths for Red/White Oak (62.5lbs/cu. ft.)