Wow! This is great stuff! As to steel wheels vs. rubber, I had always assumed that the v-shaped lugs would rob some power as they penetrated the soil (in effect, trying to lift the tractor). My engineering is confined to the armchair day-dreaming variety, so I could be all wet in my theories. I used to read the Nebraska tests when I had access to them at a state university library. They are marvels of concise information in tabular form. They even include the percentage of slip! The other day, I looked at an old photocopy of one of the tests, which showed the Farmall H with a slippage of 17% in first gear! Too much torque for the traction available with the narrow tires of the day, and possibly no weights/water added. The DB horsepower was correspondingly lower than it was in the other gears, where there is less torque and less slip. One of these days, I am going to try to look at a bunch of Nebraska tests of tractors on steel and rubber and see if I can come up with an average for power losses with both types of wheels. When I do, I'll post them here for the likes of us. Thanks for making my day, as Clint Eastwood might have put it (I think he paralyzed the punks with his stare, so they never really made his 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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