Ordering new Axle - Help with Angles - Page 2 - Fiberglass RV


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Old 08-02-2016, 09:12 AM   #15
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Name: Mike
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James,

I don't know what angle Scamp used, but this link might help you review the options. It indicates the resulting "heights" for different start angles based on no load, full load and shock load.

http://dexteraxle.com/i/u/6149609/f/...nformation.pdf


Over time, particularly if you don't take the weight off the axle in storage, the internal rubber will get compressed.
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Old 08-02-2016, 10:33 AM   #16
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Have you downloaded and read the Dexter Applications Manual from their site? You said you spoke to a Dexter guy. Was he at a dealer or Dexter?

I would suggest that you read the manual and make a list of questions. Then, speak to someone at Dexter. Ask the right questions; get the right answers.

I don't mean to cast aspersions on any of the previous answers. They are all good. But they are based on personal experience and opinions.

You are going to be living with this thing for quite some time, so it behooves you to benefit from Dexter expertise.

I say all of this because, in rereading the posts, there are a number of exchanges regarding trailer height, ground clearance and such. Per paragraph 4 on the second page of "Trailer Design Considerations" begins, " Torflex axles ride performance is at it's best when the torsion arm is at or nearest the horizontal when the vehicle is loaded at it's rated load.....". It then goes on to explain the how the geometry of the system is effected as the down angle changes.

From this, I'm gathering that down angle should not be used to determine trailer height, ground clearance, etc. Leave that to the wheels and tires.

The real key here seems to be getting a realistic picture of your expected loaded weight. "Trailer Weights In the Real World" is a good starting point. Ideally, you would have the trailer weighed and then weigh all the items you plan to add and to pack. This seem like a lot but, as said, you will be living with this one for a while.

Lastly, you may want to consider larger brakes. In several recent threads, Scamp owners have mentioned that 7 1/2 inch brakes can't be locked up on the highest controller setting. This means you have no leeway in controller adjustment. The normal procedure for proportional controller adjustment is to set the power at about mid-way and then, driving 20-25 mph on a dry roadway, push the manual control to max. If you get lockup, reduce the power setting to just before lockup. If you don't get lockup, raise the setting. When you achieve lockup, back the power setting back, just short of lockup. Recent comments indicate that with 7 1/2 inch brakes you can't achieve lockup, so in an emergency situation.............?
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Old 08-02-2016, 10:49 AM   #17
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Name: James
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I'd like to say I'm over thinking this, but in reality I have learned a ton.

I am speaking with a Dexter Application Engineer who is helping me run the numbers.
I have also download and read all their manuals several times.

I have also drawn up the configuration in AutoCAD to simulate what the ride height will look like, and how the axle pre-load will be affected (Yes. Mechanical Engineer here).

Going for "torsion arm is at or nearest the horizontal"
I believe I get that with the 10 degree down option It states a start angle of 10 deg will have a H = -0.1". This would raise my camper up 2.2". This would make it looks correct in my opinion. It would also leave the arm just slightly up from horizontal.

As for the brakes, I have been towing the unit with the 7.5's on it now with great success. Just finished 2500 miles, and no complains. I can say I tested them "once" when someone pulled out in front of me. I never felt like I couldn't stop in time. Good thought though. Hate to go through all this and find my brakes don't work
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Old 08-02-2016, 12:49 PM   #18
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Name: James
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At this point, he is recommending a 3" bracket over the 1" high profile.
This would allow me to keep the 10 degree UP angle.

I see his concerns with having any negative angle on a axle with it's trailing arm forward.
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Old 08-02-2016, 01:09 PM   #19
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Name: John
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I called Dexter to get a price on a new axle for my '71 Boelr 13'er and speced out with Ian G.'s recommendations it was $243. I called another Dexter location to speak with an engineer to get recommendations based on an estimated dry trailer weight of 1200 lbs and loaded at approx. 1350 to 1400. She said she could not for liability reasons give me her recommendations that it was up to me as to how I was "designing or engineering the trailer". I explained I was doing a restoration and all she could say is I need to get the trailer weighed and take the tongue weight and subtract it from the trailer weight to get the recommended axle weight and take into consideration the fully loaded weight... She did mention that on my thinner metal gauge frame whether it was square/rectangle, c channel or I beam type that their bolt on design could compromise the frame when torqued if not reinforced and that the bolt on bracket kit would probably be needed for my frame.
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Old 08-02-2016, 01:36 PM   #20
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Trailer: Scamp 13
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It is my understanding when your axle was built the square insert going into the axle tube was set with the points of the square running straight up and down. First level the frame. With a protractor measure the angle that will turn the insert back so its points are back to vertical. Remember your looking for the angle that moves your spindle back down to its original location. You can add that amount to the angle that the spindle arm currently sits to calculate what the factory angle was. You can see the square of the axle insert by its weld on the axle arm.
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Old 08-02-2016, 02:17 PM   #21
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Name: James
Trailer: Scamp
Wisconsin
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Well, after a lot of playing around, We ended up with the following:

10 Degrees UP but installed with a 3.0" High Profile Bracket.
This will give 2.0" to my current ride, and also allow us to keep an upward angle. I've happy with the physics, and the appearance.

Thanks everyone for their input. Attached is the drawing I ended up with using the Dexter build sheets and drawings.
Attached Files
File Type: pdf Scamp Axle - 10Deg Up 3in Bracket.pdf (11.8 KB, 19 views)
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Old 08-02-2016, 02:35 PM   #22
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Name: Steve
Trailer: Scamp 13
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Nice drawing looks like your good to go.
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