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Tractor Talk Discussion Board

Re: Narrow front vs wide front


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Posted by Brendon-KS on January 26, 2015 at 20:27:00 from (63.245.147.52):

In Reply to: Re: Narrow front vs wide front posted by oldtanker on January 26, 2015 at 18:29:11:

University studies obviously can vary. The one
I did myself as an ag engineering undergrad
(meaning nothing was published) showed a
measurable difference in favor of the wide
front. The model for both narrow and wide
front tractors had the machine setting on a
three-point base - the two back wheels and a
single point at the front. However, on the
wide front the single point was elevated to the
height of the axle oscillation point whereas on
the narrow front it was on the ground plane. A
line from this point to either rear tire
defines the "tipping axis" of the tractor. A
"stability index" of 100 was defined as when
the loads on the rear wheels were equal
(assuming the CG is located on the centerline
plane) and an index of 0 was when either rear
wheel became completely unloaded.

Having this front point elevated means that
when turning the centrifugal force acting on
the center of gravity has a shorter "lever arm"
to work with about the tipping axis which
results in less weight being transferred off of
the inner wheel. Likewise, when the tractor is
operating on an incline the CG point will cross
over this tipping axis sooner if it is along
the ground vs. being elevated. The farther
forward the CG is the more stability benefit
you get from a wide front.

Although it wasn't considered in the study the
wide front also gives you a "last chance" to
stop tipping when the axle pivot bottoms out.
I personally experienced this once with a
Kubota when backing up with the loader bucket
full of rocks. One rear tire started climbing
up a six inch high ledge and kept on heading up
until the front axle bottomed out. Dumped the
bucket and the tire came back to earth. In a
higher speed situation, however, you may have
enough momentum to flip the tractor on over
anyway which is why this wasn't factored into
the stability index equation.


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