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No numbers version: The CofG offset from centered x weight of the tree is a torque. The wedge/jack at the edge of the trunk x distance from the wedge/jack to the hinge is the equal, opposing torque. (Big) Wedge/jack force is opposed by pull force on the hinge fibers. Big wedge/jack force is...

I seemed to read in Burnham's thread reference that you net gain by shifting hinge location towards the back. There was reference to 5 or 10 degrees as maximum trunk lean angle to tackle. On a 50 foot tree at 5 degrees the top is over center by 0.087 x 50 = 4.3 feet. Placing the CofG at less...

Here's some geometry to ponder for a back leaner hinge. Put the hinge dead centre and you have 50% (minus a tad) of the trunk diameter as the lever arm for the wedge/jack to apply up force x distance to make torque on the trunk. Put the hinge at the 25% location nearer the back (of the back...

Stig, I've pondered hinge physics(?) for a while trying to visualize the action. Best research I've turned up is mixtures of some degree/progression of compression failure - folks usually say, before - some sort of progression of tension failure on the back side of the hinge. Ending with a...

I remember watching Daniel videos all those years ago. Learned what I could with an open but objective mind. Sometimes tree technique is like Holmes on Homes with an artistic or familiar technique opinion. Ask guys who build decks to critique each others work. It's like a best oil debate. I...