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With the log hooked to the 3 point, even if it is only 1 inch off the ground, no, make that even if it is flat on the ground, if it hooks on something like a rock, root or stump, the tractor front end will come up and over unless the operator can react fast enough to stop forward motion.
Loads should be towed attached to the drawbar, which is mounted below the centerline of the rear axle. This prevents backflips, even if the log hangs up on something.
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I guess this might be true if you have a very small tractor, but in reality striking a root or rock when pulling from a 3ph will just make the chain and log swing back in an arc thereby raising the front end of the log enough to clear the obstruction. On the other hand, pulling horizontally from the drawbar provides no lift whatsoever to the front end of the log and encourages it to dig into the dirt and find the roots and rocks to hang up on.
I've drug logs every which way, and the only way I will do it now is with a boom pole and tongs, but I make sure the tractor has lots more beef than the log.
Gabby
p.s. What the heck is a logging arch?