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 Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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