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Photo
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Utility Trailer from Brat rear-end <Updated Pics 9/4/05>


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9 replies to this topic

#1 DPDISXR4Ti

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Posted 12 August 2005 - 04:03 PM

I'm finally making headway on this project, and have cut the angle and box iron for the perimeter of the trailer. The bed will be 46" x 72", with a 42" length tongue. (Yes, I would have preferred to go with a 48" width, but that won't fit between the tires without modifying things)

Here's my dilema... Where do I locate the "axle" assembly on the 72" (6') front-to-back length? I can locate it anywhere, as I'm not using any of the Brat sheet metal. The weight will be carried just like the stock Brat setup utilizing the 4 mounting locations (two on each side), front and rear of the torsion bar. Note that I'll need spacers here of different thickness to level things out, and overall, to provide clearance over the torsion bar/swing arm junction flange.

Since the wheels trail behind the mounting location by 15", I'm thinking of making the mounting location dead center on the 6' run of the bed, which would locate the wheel center at the point 7/10's of the way through the bed length.

Anyone have any thoughts on the topic?

#2 Mantonite

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Posted 12 August 2005 - 05:03 PM

The rule of thumb on trailers (that I know of) is to shoot for a 10% tongue weight when fully loaded. If you could get the (estimated) weights of everything you could determine where the axle should go to match the "rule."

Just an idea...

#3 DPDISXR4Ti

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Posted 12 August 2005 - 05:27 PM

The rule of thumb on trailers (that I know of) is to shoot for a 10% tongue weight when fully loaded. If you could get the (estimated) weights of everything you could determine where the axle should go to match the "rule."

Just an idea...


Thanks, that's more than what I had to go on other than looking at other trailers to see where they located the wheels. Typically, that seems to be about 60/40, strictly from a length of bed standpoint.

I'm just struggling a bit with how the trailing arm suspension factors in. Is the pivot point considering the mounting location or the wheel location? The wheel is what I'm thinking.

#4 Scoobywagon

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Posted 12 August 2005 - 05:30 PM

Its gonna be the wheels, as the trailer's center of gravity will be directly over them.

#5 Mantonite

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Posted 12 August 2005 - 09:38 PM

Be careful putting the CG directly above the wheels... any weight in the back will give you a negative tongue weight. Not very good for towing, and really bad when it's time to unhook the trailer. That would be one helluvan uppercut!

And yes, the wheels are the pivot point. The trailing arm just moves the CG forward a bit.

Lemme know how it goes!

#6 DPDISXR4Ti

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Posted 13 August 2005 - 10:35 AM

Thanks for the input - it's kept the brain cells firing. No question, I'll keep a front weight-bias with this setup, but I think I'm going to move the mount location forward 8", now that we've confirmed that the WHEELS are the pivot point, not the mounting location. That will locate the wheels at a 60/40 split (towards the rear) on the bed, still keeping a forward weight basis.

#7 Mantonite

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Posted 16 August 2005 - 11:50 AM

Take a look at this thread:

http://www.ultimates...ead.php?t=41383
The offer for the spreadsheet is good for you too. Let me know if you want it, and how to get it to you.

#8 DPDISXR4Ti

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Posted 16 August 2005 - 11:58 AM

Hey, there's two of us with this nutty idea!Appreciate anything that will help me to do this right (or at least "better"). Feel free to send anything along to brad.anesi AT netiq.com

Thanks!

#9 DPDISXR4Ti

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Posted 16 August 2005 - 12:11 PM

I didn't want to disappoint Mr. Moose, so here's a pic of the basic layout.
Posted Image

#10 DPDISXR4Ti

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Posted 04 September 2005 - 10:51 AM

Time for an update with pics. A couple comments - looking for any thoughts, suggestions, etc...

1) Unloaded as it is, there's obvious positive camber in the wheels (I'm going to guess about 2-3 degrees. Do we think this
will move closer to neutral or somewhat negative with a load on the trailer?

2) Will the way I've got the rear assembly mounted to the frame effect the change in camber at all? The geometry is somewhat
different than when attached to the Brat body - the attachment point sits higher. As a result, I need to space the forward
mounting points down about 1.5" compared to the rear. On the stock setup, the two vary in height by only about 1/2".

3) Can someone help me out with the operation of the center adjustment bolt? I assume this stiffens/loosens the
spring mechanism, which might be helpful depending on the weight of the load. Unloaded, I think I'd want it full
soft, right? Is that fully counter-clockwise?

Okay, enough talk....

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