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Re: WIDE narrow
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Posted by Stability: Kim (NY) on December 05, 1999 at 09:20:01 from (137.142.50.10):
In Reply to: WIDE narrow posted by T'other Fred on December 04, 1999 at 19:02:17:
It is correct that the majority of the stability in a tractor comes from the width of the rear axle, but it is not correct that the front end does not effect this stability. It works like this. On a tricycle front end the "roll" line, the line upon which the tractor's cg is calculated is a line from the rear tire to the center front of the tractor, in other words a diagonal line. This can cause a less than intuitive manner in which a rollover can happen because the height above the ground that the cg is placed is not parrallel to the ground but increases in height from very low at the front of the tractor to quite high at the back, this is one of the reasons why loaders on narrow front ends are especially dangerous. I believe that a major advantage of the narrow front end however was the triangle's ability to keep all 3 points in contact with the ground therefore increasing traction. A wide front end tractor can easily lift a rear wheel off the ground well before it reaches a point close to rollover, however a narrow front end tractor will keep all tires in contact with the ground....until it goes over....and then it will do it very quickly. In other words a narrow front end will roll over almost immediately after a rear tire leaves the ground. This is the safety factor in the rocker on the front of a wide front end. The operator has the margin between when a rear tire leaves the ground through the motion of the rocker until the front tire leaves the ground to correct a rollover potential. Once you lose two wheels on the same side however you'd better have your seat belt on and your ROPS installed. Good Luck Kim
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