In our studies we defined a complete loss of stability as when one rear tire became unloaded - at this point the tractor is balanced about its "tipping axis". The width of the front axle never comes into play. The key is the height at which the tractor pivots at the front end. With a narrow front this point is at ground level while on a wide front it is elevated by up to several feet. This raised tipping point means that the WFE tractor has to lean over farther for the center of gravity to cross over the tipping axis. A similar situation occurs when turning a corner at higher speeds. The centrifugal force acting horizontally at the center of gravity is closer to the tipping axis which means it is applying less moment to unload the inside tire. The WFE vs NFE stability differences are more pronounced the farther forward and upward the center of gravity is located, such as with a loader. As you say, the best defense is to lower the tractor's CG and also have the rear tread width set as wide as possible.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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