504-2 said: (quoted from post at 19:10:05 12/04/09) I have thought about this before, PTO speed is 540 rpm, if the rear end of the truck was still in the truck the motor runs at one to one so the input speed would about 2500 to 3000 RPM at 60 MPH but the tractor it is only 540 so speed would only be 25 to 30 MPH. Yes 30 is very fast on an old tractor but not any faster than an 8-N with overdrive. 540RPM would only be an idle on a truck.
Your math is al -a -skew. If the original truck turned 3000 at 60, this is a factor of 3000/60== 50
So if we have a PTO running 540, that's 540/50 or only about 11 mph
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