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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
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