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What is the weight difference between the two?? I suspect that the H weighs more thus it will have the ability to pull harder since physics is the same for both tractors. That is, the maximum frictional force is directly proportional to the force perpendicular to the surface creating the friction. In the case of a tractor, the frictional force that propels the tractor forward, is the shear strength of the soil - OR the frictional force created when the rear wheels try to make the soil surface slid over the lower layer. NOW, the design of the N series hitch, by Ferguson, was such that the suction of the plow (the force pulling the polw deeper into the ground) was transfered to the rear wheels. This gave the lighter N's the same ability to pull a plow as it's heavier contemporary tractors made by other companies. They all used plows that were pretty much simple pull type, not unlike that pulled by a horse or mule. So these polws could not transfer the suction load to the rear wheels of their tractors. In the case of your disk, you didn't say, but I suspect that it is a pull type. And even a TPH Dearborn disk will not add as much load to the rear wheels as a plow will, since the disk is riding on top of the ground to break up the dirt clods. Rather than trying to pull it's self into the ground Finally, remember that HP is a measure of how FAST you can do work not a measure of the force that can be applied. I could take a 1HP motor and move a battleship, BUT it would be VERY slow! And it would take something like millions of HP to move an N at Mach 10. :-) Regards,
Larry
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