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Old 01-29-2014, 12:09 PM   #1
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Load balance

So is the math as simple as I think it is?


If I put 100lbs 1/2 way between the coupler and the closest axle of the trailer do I end up with 50lbs of the weight on each and so on?
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Old 01-29-2014, 01:35 PM   #2
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So is the math as simple as I think it is?


If I put 100lbs 1/2 way between the coupler and the closest axle of the trailer do I end up with 50lbs of the weight on each and so on?
Hmmm......I think it works that way.

50 lbs to the coupler, and 25 lbs. to each of the axles.
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Old 01-29-2014, 01:55 PM   #3
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Hmmm......I think it works that way.

50 lbs to the coupler, and 25 lbs. to each of the axles.
I don't think it equals out the load on the axles at 25# exactly. It does however put 50# on the suspension.
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Old 01-29-2014, 03:09 PM   #4
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I don't think it equals out the load on the axles at 25# exactly. It does however put 50# on the suspension.
Probably not exactly 25 lbs. on each axle, but pretty close.
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Old 01-29-2014, 04:02 PM   #5
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Considering that he has a popup, listed in his signature, and only has one axle then you would get an even distribution between hitch and axle.
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Old 01-29-2014, 04:09 PM   #6
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You are correct in that with the current trailer, I was thinking along the lines of the new 23RS or 210TRS I hope to get.

It has the nice storage area at the front and I am trying to figure out if I will even be able to use it.
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Old 01-29-2014, 05:40 PM   #7
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Basically, yes, weight will distribute evenly...... at a standstill. I wouldn't rely on those same weights when moving. Acceleration/deceleration are going to affect them as inertia is applied. It's been multiple decades since I last took a physics course, so I don't remember the formula to figure out by how much, just that it will.

I assume you're asking the question because you're concerned about some kind of weight limit?
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Old 01-29-2014, 06:09 PM   #8
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Ya tongue weight is going to be close and I am now over thinking it lol

BMW rated it for 600lbs but I can't see the factory not giving this like a 2:1 safety factor or more so if I end up at like 600 or just over I don't think the world will end, I'm all worried but I bet most people could jack the back of the car up with the hitch and not even think about it.
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Old 01-29-2014, 06:33 PM   #9
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If you put 100lb directly over the axle, you'd add 100lbs to the axle. If you put 100lbs directly over the hitch, you'd add 100lbs to the hitch. If you put 100lbs exactly between them, you'd add 50lbs to each. Let's say the distance between the hitch and the axle is 10 ft.

If it's not 50/50, you need to pick a reference point. Let's call it the hitch. If you add 100lbs 25% of the way back from the hitch (2.5 ft), you'll put 25lbs on the axles, leaving 75lbs on the hitch. Conversely, if you put 100lbs 75% of the way back from the hitch (7.5 ft), you'll put 75lbs on the axles, leaving 25lbs on the hitch. So the axle weight would be directly proportional to the percentage of the distance from the hitch (and the load on the hitch is inversely proportional to the percentage of the distance from the hitch.)
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Old 01-31-2014, 09:20 AM   #10
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When i raced circle track dirt cars, (hence the 'cowracer' name) I had this argument more than once. Weight distribution is critical, enough so that I spent $1300 on scales to be able to weigh the wheels individually and at the same time. In our class, we had a minimum weight of 3300#. You build them light, then add weight where you wanted to get up to minimum. I usually had 300-400 lbs of lead ballast bolted onto the car at various points.

The standard way of doing it was to hand load 45 to 70 pound lead bars onto the car and then put the car on the scale. This could make for a tiring evening going back and forth trying to trim the car up. As I had 7 or 8 hard points where I could mount lead, I figured I ought to be able to do this mathematically. I wrote a down and dirty program that factored in wheelbase, track width, and the x and y coordinates of the mounts, coupled with the weights of the bars.

Some of the 'old hands' told me there was no way that it would work because of spring rates and shock rates and etc. I said, "If i put 50# on the car, I should see a net increase of the sum of wheel weights of 50# no matter what shocks or springs. Once I got the runtime bugs out of the program, I found out that the mathematically calculated weights were within a percent or so of the actual weights. It even accounted for the fact that if you hang weight behind the rear axle (like on the bumper) you actually wind up reducing front weight and transferring it back to the rear axle. Think teeter totter.

So yes, if you put 100# exactly between two points, they will split the weight evenly.

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