Forum Discussion
Ron_Gratz
Sep 10, 2004Explorer
--- With the application of a 2000# load 30" from the ball coupler (as in your example), it does move the center of gravity of the TT forward. ---
Ken, this statement is true if the 2000# LOAD results from placing some MASS weighing 2000# at that location. The statement is not true if the 2000# LOAD results from TENSION in the spring bar tensioners. The CG of the TT can be moved only by adding or removing mass or by moving some of the existing mass.
Such confusion about loads resulting from mass versus loads resulting from other effects is the reason I am trying to avoid the use of the term "weight distribution" and its counterparts. If one is told that a WD hitch "distributes weight", and if one knows that "redistributing weight" can result in a change in location of the CG, then it is not illogical to incorrectly conclude that application of a WD hitch can move the CG. The problem stems from inconsistent definitions.
I must assume that this should help eliminate sway to some degree, since sway is a function of the position of all of the loads on the trailer in front of and behind the TT axle. (The mechanics of sway don't separate the distribution of the trailer weight from any other load applied to the frame.) Is that true?
The mechanics of sway are determined primarily by horizontal forces on the TT. When a mass is accelerated horizontally, a horizontal force results. Weight, per se, is not involved directly because weight is a vertical force (that comment ought to precipitate another 150 posts). Weight on the TT tires indirectly influences TT sway because it, among other things, determines how much horizontal force the tires can generate.
WD hitch forces are not involved directly in TT sway dynamics because they are vertical forces. However, changes in TV axle loads can have a significant effect on TV/TT sway dynamics primarily due to changes in steering response. The vertical load on the tires determines how much horizontal force the tires can generate.
Is this any clearer or have I only added to the confusion?
Ron
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