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 - A Farmall Story - by Ed Meadors. The year was 1978. Our young family had recently moved to rural Chesapeake, Virginia to a plot of land which would finally allow us to realize our dreams of a huge garden, critters and more lawn and pasture than we would ever use! We needed a TRACTOR; not a riding mower or tractor wannabe, but a real TRACTOR. The answer to our needs materialized in the form of a '44 Farmall A, complete with cultivators, discs, single plow, a 5ft.Woods belly mower and one, mounted spare 9.00x24 rear wheel.
... [Read Article]
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