Remember, today's tractors are also turning more hydraulic pumps for the powershift, bigger pumps for the hydraulics, with more parasitic losses at the motor end for AC and the alternator due to higher electrical loads. The new MX Magnums are actually comparable to the 89 series Magnums they replaced, but you can't really compare the drivetrain power losses in them to the older tractors because of the powershift vs gear transmissions, and the hydraulic capacities and such.
I have no idea what the flywheel power on something like an SM or 1066 would be. Did they even bother to advertise that back in the day?
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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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