Ordering new Axle - Help with Angles - Fiberglass RV


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Old 08-01-2016, 03:10 PM   #1
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Name: James
Trailer: Scamp
Wisconsin
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Ordering new Axle - Help with Angles

OK. I have made a lot of calls, learned a lot on axle specs and info.
I finally have everything together except one piece of info.

What I have about to be ordered:
Axle Capacity: 2200 lbs.
Hub Face: 63.00"
Outside of Frame: 48.25"
Bolt Pattern: 4 on 4”
Brake Option: 7” x 1 1/4” – Electric
Lubrication: E-Z Lube®
Tubing: 2.17” OD Square (#9 Dexter spec)
Bracket Profile: High
Bracket Orientation: Reverse
Side Mount Hanger Kit: Yes
I am running ST175/80R13 tires.

OK. Last But not least.
Start Angle Degree.

My current arm measures 10 degrees up, but it's toast. I have found other threads reporting this angle on a dead axle.

If I go with 10 degrees down (and I believe that was what scamp used back in 1977), that would give me 2" of lift from my current state. The axle is 8" off the ground now. If I go with 22.5 deg down, I gain 3.5" or so.

I have seen some pictures of 22.5 degrees and it looks high!
Although I'm low now. 3.5" doesn't seem like a lot.
Am I over thinking the extra inch?
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Old 08-01-2016, 04:15 PM   #2
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Name: Eddie
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What is the square tubing used for?
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Old 08-01-2016, 04:21 PM   #3
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That's just the size that Dexter quotes.
Here's a picture of what I have in currently.
Attached Files
File Type: pdf Original Axle Dims.pdf (67.0 KB, 29 views)
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Old 08-01-2016, 04:32 PM   #4
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Name: Jack L
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You can also specify what you want the torqueflex tension to be. The #9 is a 2200 pound axle but the suspension can be set to whatever works best in your trailer.


For example, you might want the suspension set at 1800 pounds. It's the same axle with less tension on the rubber torqueflex system. The max is 2200 pounds but might be too much for your trailer.
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Old 08-01-2016, 04:46 PM   #5
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When I called scamp they mentioned 2000. Although, I know they've moved away from Dexter.
Most other swaps I've seen, most people seem to be going with the 2200..... ?
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Old 08-01-2016, 04:50 PM   #6
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Pictures always help.
Here is what is currently there...
Attached Thumbnails
IMG_20160726_180818_1600x1197.jpg   IMG_20160726_180759_1600x1197.jpg  

IMG_20160726_180748.jpg   IMG_20160726_191540.jpg  

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Old 08-01-2016, 05:16 PM   #7
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Quote:
Originally Posted by jdconnel View Post
When I called scamp they mentioned 2000. Although, I know they've moved away from Dexter.
Most other swaps I've seen, most people seem to be going with the 2200..... ?
The #9 is a 2200# axle, which means it has a maximum capacity of 2200 pounds. The Torqueflex system uses rubber inserts in the axle tube and they are what provides the suspension springiness Think of this as the springs on your car. Heavier springs might not be necessary, or they could be very helpful. Depends on the application. The Torqueflex can be ordered with what ever springiness you need. It will be a #9 with a suspension fine tuned to match the trailer. It's just how much tension they pyt on the rubber inserts.
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Old 08-01-2016, 10:16 PM   #8
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Any recommendation on what to set the tension to for a 1977 13ft Scamp?
No idea what the weight is. I would think targeting 1500 when fully loaded up.
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Old 08-01-2016, 10:29 PM   #9
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I found this advice from a Dexter guy:

If you put a 1,000# trailer on a 2,000# rated axle, you're not going to get much "squish" and/or "settle". Only spec your Load Rating at about 30-40% more than your spec'd or estimated NET weight.

I expect loaded up my camper will be about 1500# with gear.
+30-40% puts me at 1950 - 2100.

Not much tuning it would seem if that all holds true.
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Old 08-02-2016, 12:01 AM   #10
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Quote:
Originally Posted by jdconnel View Post
Any recommendation on what to set the tension to for a 1977 13ft Scamp?
No idea what the weight is. I would think targeting 1500 when fully loaded up.
I checked the "trailer weights in the real world" thread and 15-1600# loaded looks like your target weight.
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Old 08-02-2016, 07:14 AM   #11
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Ordering new Axle - Help with Angles

New Scamp 13s use a full-rated 2200# axle, probably because they can be heavy if fully equipped. The options list is a lot longer today than in 1977. Seems like 1800# or 2000# would be about right for yours, unless you are planning some significant remodeling.

As to the start angle, you have to ask yourself what you are trying to accomplish. Raising the trailer comes at a cost in wind resistance, stability, and step-in height. Just the new axle alone, same start angle, will probably give you an inch or two. 22.5-degrees down angle sounds pretty extreme to me.
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Old 08-02-2016, 07:37 AM   #12
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I am leaning towards my original 10 degree down.
That will raise my camper 2.5" from its current state. (22.5 will raise is 3.5")
I think this looks correct and I like the smaller angle for travel.
That means my step in height will be 12.5. Most than fine.

My axle is leading currently. It is also stuck in the UP position. Measured 10 degrees perfectly, so I have a good baseline measurement comparing dexters +10 to it's -10.

When I called scamp they said all they do now is 22.5. Internet searching said they used different angles back int the day, but the young guy (I think) I talked to stated he only knew of the 22.5.
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Old 08-02-2016, 07:44 AM   #13
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The current 22.5 is 22.5 UP. The axle tube is lower on current trailing arm installations because of the drop-floor.
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Old 08-02-2016, 07:51 AM   #14
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JD,

It’s easy to reach the weight ratings with some large coolers, canned food and other stored goods, water tank filled, double propane tanks and larger or double batteries, solar panels, kids toys, and on and on. It doesn't take long for it to just happen.

I installed the 2,200# rated, 23.5 degree down axle. The weld-on bracket will raise it a little more also. It raised the trailer, but also gives longer torsion life before it sags that low again. As Jon said, check with Scamp to see what they installed back then and why.

The new height will have a different feel regardless of what angle you go with so will probably use a step-stool to make it easier to enter and exit anyway.

I would consider going to the 5-bolt pattern. It is the newer style and wheels will be easier to find.
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