The older tractors all had the horsepower measured at the PTO and the drawbar. PTO horsepower was always greater than at the drawbar, but those figures gave a very REAL representation of the tractors capabilities.
Todays tractors have the horsepower measured at the flywheel which is much more impressive, but not very realistic because of the losses encountered while transferring that power through the transmission, hydraulic system, and other parasitic losses. I'm not sure what the percentage is, but I'll guess that any of todays 150 horsepower rated tractors actually lose somewhere around 30% to 40% of the engine power before it can be put to the ground and actually put to work.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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