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cutting frame with dump box and turning into pull type wagon
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Big Ben
Posted 2/5/2012 21:14 (#2208265 - in reply to #2205801)
Subject: Re: The longer the frame the more weight on the back axle ... How?


Columbia Basin, Ephrata, WA
Mike SE IL - 2/4/2012 14:25

dt4020 - The longer the frame the more weight on the back axle and less on the tractor.
Umm... I realize it's been 40 years since I studies Geometry, but can you explain that? I may be thinking of it differently than you mean. I am interpretting it as saying the longer hitch will carry less weight.

It looks to me if anything the longer frame will add weight to the hitch because you have the weight of the tongue added to it.  If the axles are moved forward, either by relocating the the bed or the axles, then the balance will change and the axle weight and tongue weight will change.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

               ^                                      

If my axles are at 6 the hitch is carrying the weight of 7,8,9,10,11,12,13,14, and 15  regardless of how long the tongue is.  I think you are confusing it with a lever.  A lever takes less force the longer it is, but the lever doesn't have weight on both sides of the pivot point



In that example, the hitch should only be carrying PART of the weight of 13, 14, and 15. It takes 7-12 to balance 1-6, and 13-15 will be shared between the hitch and rear axles according to the length of the hitch.

If the hitch were at 15 (very short hitch) the hitch would carry all of 15, and maybe 90% of 14 and 80% of 13. Heavy hitch.
Now if you had a hitch long enough to put 14 at the mid point between the axles and hitch, the weight of 13-15 will be divided evenly between the hitch and axles. That would be mutch lighter than the short hitch, even though the hitch itself will add a little weight because of extra iron.

To get a well balanced trailer without having to build a real long hitch, you'd want to start with a cabover truck. They will have the center of the drive axle(s) closer to the center of the box to avoid overloading the front axle.


Edited by Ben in the Basin 2/5/2012 21:22
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