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Torsion Axle

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mjlrpod View Drop Down
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Post Options Post Options   Quote mjlrpod Quote  Post ReplyReply Direct Link To This Post Topic: Torsion Axle
    Posted: 10 Aug 2022 at 2:56pm
My new camper, surveyor legend 19rble, has leaf springs. I assume thats a good thing? Is it better, worse, or equal to a torsion axle? Some roads I travel fairly often are pretty bumpy. 
2017.5 Rp-172
2020 R-pod 195
2015 Frontier sv 4.0L 6cyl
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lostagain View Drop Down
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Post Options Post Options   Quote lostagain Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2022 at 5:01pm
My Sonoma also has leaf springs that, as I've mentioned before, are mounted right at each end of the axle so there is no overhang or cantilever issue.  We've never had any issues on rough roads, though always take my time and do my best to avoid jolting impacts.  The biggest impediment to rough roads is the height of the torsion bars on the WDH.  

mjlrpod, what is the chassis configuration on your new trailer?  Is it the box beam type configuration like the rPod or do they use I-beams for the frame rails?  We'll watch for it as we drive through MA this weekend on the way to NH's White Mountain National Forest. Wink
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offgrid View Drop Down
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Post Options Post Options   Quote offgrid Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2022 at 8:58pm
It's not that either leaf springs or torsion axles are better or worse, it's just that the engineering considerations and objectives are different.

Torsion axles are light, compliant and are self dampening, but inherently create stress points that leaf springs don't.

So it depends on what the designers objectives and specs were. In the case of rpods the designers were looking for low cost, light weight, and a compliant suspension. They weren't looking for high clearance or to take high g forces from running rough roads at speed. So the design objectives favored the use of torsion axles. High ground clerances and better ability to handle g forces would favor selection of leaf springs.

It's not that torsion axles can't be designed to be more robust and have higher clearance, they can. Its just more costly to do those things than   thanif the designers chose to use leaf springs. You can even reinforce the frame and axle on your rpod to address those weak points if you want to.

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mjlrpod View Drop Down
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Post Options Post Options   Quote mjlrpod Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2022 at 10:52am
Originally posted by lostagain

 
mjlrpod, what is the chassis configuration on your new trailer?  Is it the box beam type configuration like the rPod or do they use I-beams for the frame rails?  We'll watch for it as we drive through MA this weekend on the way to NH's White Mountain National Forest. Wink

My leafs are also mounted on the exact end of the axle as well, I'm very happy about that. I'm always so afraid of bending my axle. 
I really don't know the frame config at this moment. I think it's the same as the pod. It won't be delivered until sometime in September, so I won't know till then. It's a 2023 and so far there is no documentation on 2023's, I believe none have built yet, to know what the new model year will be.
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2020 R-pod 195
2015 Frontier sv 4.0L 6cyl
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David and Danette View Drop Down
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Post Options Post Options   Quote David and Danette Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2022 at 1:41pm
Our previous two campers the r-pod and Vibe had torsion axles so when we bought the Vista Cruiser with a leaf spring axle I was concerned it having a rough ride. But I can't tell the difference between the torsion axle and the leaf spring axle. We have a thirty year old aluminum utility trailer with a torsion axle and it has worked very well though when towing empty it bounces a little. When we had our r-pod we drove over a railroad crossing which was a bigger bump than I had expected and I think the r-pod went airborne for a few feet and it handled very well. So by my experience a torsion axle may have more of a bounce than a leaf spring axle.
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