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The Center Of Gravity is very relevant to pull the tree over. At least in your wording, Robert, you don't seem to have it right about that: No, you don't push the tree past the COG. It's the tree's COG you have to push/pull past the equilibrium point of the hinge (combined with the folding...

That isn't a MA here. If you judge your rope not strong enough to be in the safety margin for the intended task, an easy way is to fold the rope in 2 and use this doubled rope as if it was one plain rope. Two times stronger, but also two times shorter. An important point is to rig that with the...

Thanks for the new pics Robert.

The metal hinge should be really beefy to sustain the giant load when the notch closes. It seems to me that some metal bits would fly around !

Now, I'm confused. I don't recognize all the story and explanations in the stump's pics. In the two first pics of the stump (before fall and with the wedges already in place), on both sides the notch seems pretty clean. I can't see any evidence of a dutchman at the corners. The back cut is...

The nipping leaded to the failure as you cut nearly all the holding fibers. Before nipping the hinge, you should have figured out why it was still standing. The main point. Pulling by hand, even with a 3/1 MA, doesn't give you much force (not to say nearly zero force), but the truck should have...