Any interest in a Shock absorber kit for Scamps? - Page 3 - Fiberglass RV


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Old 09-26-2014, 11:20 AM   #29
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Name: JD
Trailer: Scamp 16 Modified (BIGLY)
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In any case the shock needs to match the spring rate and the weight of the trailer for the maximum benefit. Too little damping and the extra oscillation will still be there, too much and the ride will be too harsh.
The AL-KO have four shocks available for less than 900 KG (green), 901 - 1300 Kg (blue), 1300 - 1800 KG (red), and 1801 - 4000 Kg (Black).
I understand that AL-KO may have a bad reputation (I don't know why) but there is a difference in design. The Dexter has four rubber cords for suspension and the AL-KO have three larger diameter cords.
I think the weight range is sel by the length od the cords in the axle.
If the AL-KO have three larger cords they may be more compliant, but there is so much that depends on the compound and the durometer rating of the rubber.
I think it is worth the cost, but I would like to have some idea that the shocks were matched to the spring and weight class fo the trailer for best benefit.
If the design of the aftermarket parts could be made as I suggested that would involve a bracket tying to the arm with the shock in extension like the AL-KO then those shocks could be fitted for a better match.
All that would be rewuired is the bracket that would attach to the arm instead of the brake mounting plate and then the rest of the AL-ko system would work. This would be easier and cheaper to fabricate than the mounting to the brake hhub aand give better ground clearance.
Just a thought.
If these axles had that darned slot then Easy-Peasy, but they don't.
Neither the AL-KO nor the Dexer have the mounting slot, but one bracket could be made for both, pprobably out of 3.8" plate bent to fit the arm with proper extension for the AL-KO geometry.
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Old 09-26-2014, 11:48 AM   #30
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I think that single axle trailers (of any ilk) would benefit from shock absorbers. There is a lot going on that is not dampened by another axle. Just my humble opinion, I am not an Engineer nor did I stay at a Holiday Inn Express last night. As I move toward more use of my Scamp in general and particularly more boondocking over potentially rough terrain I will carefully consider the addition of shocks and probably do so.

I equate the shock issue to balancing trailer wheels/tires. A lot of people do not bother to balance them on a trailer. Hmmm, they are going down the same road as the tug and itsí wheels/tires are balanced arenít they? I donít want my egg beat, or shook to death any more than the tug!
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Old 09-26-2014, 01:26 PM   #31
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Originally Posted by redbarron55 View Post
In any case the shock needs to match the spring rate and the weight of the trailer for the maximum benefit. Too little damping and the extra oscillation will still be there, too much and the ride will be too harsh.
The AL-KO have four shocks available for less than 900 KG (green), 901 - 1300 Kg (blue), 1300 - 1800 KG (red), and 1801 - 4000 Kg (Black).
I understand that AL-KO may have a bad reputation (I don't know why) but there is a difference in design. The Dexter has four rubber cords for suspension and the AL-KO have three larger diameter cords.
I think the weight range is sel by the length od the cords in the axle.
If the AL-KO have three larger cords they may be more compliant, but there is so much that depends on the compound and the durometer rating of the rubber.
I think it is worth the cost, but I would like to have some idea that the shocks were matched to the spring and weight class fo the trailer for best benefit.
If the design of the aftermarket parts could be made as I suggested that would involve a bracket tying to the arm with the shock in extension like the AL-KO then those shocks could be fitted for a better match.
All that would be rewuired is the bracket that would attach to the arm instead of the brake mounting plate and then the rest of the AL-ko system would work. This would be easier and cheaper to fabricate than the mounting to the brake hhub aand give better ground clearance.
Just a thought.
If these axles had that darned slot then Easy-Peasy, but they don't.
Neither the AL-KO nor the Dexer have the mounting slot, but one bracket could be made for both, pprobably out of 3.8" plate bent to fit the arm with proper extension for the AL-KO geometry.
I think you're on the right track. I wonder if it's even possible to design a shock with the required compression forces to fit on the short rubber torsion axle arm. If you look at an automobile shock they take all the vertical space possible. That is from the A-frame to near the bottom of the hood. They're also in direct line with spindle so there's no side load. Now you look at the small travel of the arm of rubber torsion axles and small amount of space to avoid side loading and get the right amount of air compression you've got a real engineering problem. I suspect that this is why Dexter doesn't offer shocks for their Torflex axles.

DONNA.... Could you provide a link to the Casita with/without shock video? I'd like to see if what I the video shows is true or not.
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Old 09-26-2014, 01:45 PM   #32
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Another thread ruined by thread drift.

This is my final plea to stay on topic.
If this plea doesn't work then I don't know what to say.
8 posts from 1 person that completely ignore the request in the original post seems a bit rude to me. If you want to start your own thread about "Shocks dont work on torflex axles and I can prove it" please use the new thread button and dont pollute this thread.

For those of you that have difficulty understanding English here is the pertinent part of the original post

"Please reply if you might be interested in adding shocks to your Scamp."
I was going to ask if you had a set up for a Dexter 2200# axle,(Scamp13) but I DON'T have any difficulty understanding English, and I wouldn't have any difficulty building my own if I get a notion.
Now back to the regularly scheduled commercial.
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Old 09-26-2014, 02:29 PM   #33
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Name: JD
Trailer: Scamp 16 Modified (BIGLY)
Florida
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I am interested in adding shocks to my trailer!
There
Shock absorber should more accurately be called dampers like the Brits do. They so not absorb shocks, the springs do. The dampers dampen the oscillations caused by flexing the springs. The damping is necessarially dependent on the spring rate and suspended weight. This determines the resonant frequency of the system.
The dampers serve to dampen these oscillations and keep them within some limits.
The more important thing from our towing point of view is the damping in the side to side motion which is 180 degreesa apart. This translated into the swaying motion under the worst conditions and when braking and the trailer is coupled higher than the roll center of the TV causes upset in its stability. If the braking or turning forces exceed the limits od approximately .3G and the resuling forces put the TV in an oversteer condition a jack knife will occur.
Controlling these forces is why I want properly calibrated shocks for my trailer.
I tow with a 2009 VW TDI Sportwagen and when fitted with the OEM trailer wiring harness the cars stability system will activated the European mandated T-ESP control which will act to enhance stability of the system under this condition. The car will brake an individual wheel or wheels, accellerate, and give electronic assist in the proper direction to cancel the oscilations.
This is why I want to install the factory Westfalia kit in my JSW. ALso add the shocks as well.
Any car in Europe or the UK is required to have T-ESP to be approved to tow a trailer. Most do. I assume that this would include at least euro spec Subarus etc.
The european regulations and trailers are advanced compared to what is available in the US.
The key is properly calibrated shocks for the spring rate and weight. This is why I am leaning towards adapting the AL-KO axel and shocks to my 16' Scamp. The shocks are calibrated to the AL-OK axles and weights as I called them out earlier.
The shocks are valved and the lever arms and shock length are also engineered for the axles. How this would work when adapted to the Dexter I wouldn'r know, but the starting degree is the same and the ride heigth is the same so the rate must be similar.
The size of the shock other than the stroke length would not matter since overheating of the shock would be unlikley.
If you have looked at the pictures and video I have posted you will see that they are ( as the Brits would say) a pretty piece of kit.
The other adaption from the Casita setup from Orbital would also work, but as far as I knoe it would be a one size fits all and I don't know about calibration of damping.
Sorry for the long post, but sometimes it takes more electrons to say what I mean.
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Old 10-01-2014, 07:44 AM   #34
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Originally Posted by Byron Kinnaman View Post
DONNA.... Could you provide a link to the Casita with/without shock video? I'd like to see if what I the video shows is true or not.
Casita Bolt on Shock Kit Demo - YouTube
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Old 10-01-2014, 08:00 AM   #35
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Donna's vid pretty much tells the story. With hard, high pressure ST tires it is important (and difficult) to keep the rubber on the road and as the vid shows the shocks help do that.
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Old 10-01-2014, 10:39 AM   #36
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Thanks Donna.
What I see is just exactly what I expected to see. The tires bouncing up and down with reference to the trailer. It's hard to tell but I don't see any difference between the two when watching the about of bounce with reference to stuff the trailer is driven past.
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Old 10-01-2014, 11:41 AM   #37
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Originally Posted by Byron Kinnaman View Post
Thanks Donna.
What I see is just exactly what I expected to see. The tires bouncing up and down with reference to the trailer. It's hard to tell but I don't see any difference between the two when watching the about of bounce with reference to stuff the trailer is driven past.
To me it appears that both trailers bounce, but the trailer with the shock absorbers stops bouncing sooner than the one without.

I don't really have a need for shocks on my Escape at this time, but have no objections to others considering them for their own trailers.
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