Posted by scotc on January 23, 2011 at 09:16:39 from (75.221.128.198):
In Reply to: Re: C.G. of an M? posted by CenTex Farmall on January 22, 2011 at 13:20:34:
Will this be a gooseneck, or a semi-trailer? If it's a semi-trailer, to be pulled by a heavy truck and not a pick-up, just put the axle in the back. If it'll be a gooseneck, I'd want more than one axle.
I think you would want the two tractor's centers of gravity centered on the point where you would have the center of gravity if you only had one tractor on.
Sorry in advance for the hi-jack. About it being impossible to roll a tractor over backward because of where the front of the swinging drawbar hooks, that's BS. It's how high and how far behind the axle the hitch point is. The Fords and Fergusons roll easier because the hitch point is up high and close to the rear axle. If you moved the hitch point back and down a little, or even just down, they wouldn't flip as easily. If you doing something like dragging logs, you can get the same effect by using a longer chain. You want the drawbar to point at the draft center (the center of the load, on a log it would be the stump, on a trailer, where the tires meet the ground, on a plow the center of the middle bottom, or halfway between the middle bottoms) before the COG comes up over the rear tires. Ideally, for traction, it would be just as the front wheels are coming off the ground. Once the drawbar points below the draft center, the load will actually pull up on the drawbar. If it starts bucking, it can still go over, but it gives you a few seconds to hit the clutch first, at least.
There is a section in the old JD book "Operation, Care, and Repair of Farm Machinery" about finding and adjusting plows to the draft center.
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