Rule of the thumb is 10 hp per shank on the chisel.
I've proved this by pulling an 11 shank chisel with a 100 hp tractor and a 13 shank with 130 hp. Both were a good load. I chiseled some ground that had never been chiseled before with a 1086 Farmall and a 13 shank chisel, and it was full throttle, 1st gear all the way, sometimes with the TA pulled back and the front wheels riding about 4" off the ground.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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