My senior design project in engineering school was developing a model to mathematically determine the relative stability of a tractor during operation. The model took into account the slope, speed, turning radius, tread width, wheelbase, weight, center of gravity location, and other data. Tricycle tractors could be simulated by entering "zero" for the front axle pivot height. Complete instability was defined when the weight on either rear wheel went to zero. (Note that a front wheel did not have to come off the ground to have "no stability". The front axle width was actually not even used in the equations since it doesn't matter by this definition.) Using this model it was easy to determine the conditions that would cause a rollover with a tricycle tractor where a wide front would still have been upright. It is all based on the relationship between the forces acting on the center of gravity and the "tipping axis" which is a line from where the rear wheel contacts the ground to the front axle pivot location. For both slopes and turns the wide front is physically superior when it comes to stability. As others have said, though, both are capable of being rolled over given the right (wrong?) set of circumstances.
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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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