PeterGT4
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| posted on 23/5/04 at 06:18 AM |
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De Dion suspension specific questions...
May someone please provide the dimensions of the De Dion tube (O.D., wall thickness) used in either a Caterham, or other Seven-based kit.
I purchased and assembled the Tamiya 1/12th scale Caterham kit (awesome by-the-way!) and by scaling-up, I came to a rough size of 2"+ O.D., but
would like to know just how light (or heavy) I would go in fabricating the real De Dion tube.
Thanks in advance.
Picture below of the model's suspension.
 
Rescued attachment SSeven11.jpg
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type 907
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| posted on 23/5/04 at 07:25 AM |
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WOW !!!!
Thats the "best finished" Locost I'v ever seen.; 
I like the anti roll bar.
If you can't scale up the car, scale down the driver? LOL
Paul G
Too much is just enough
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britishtrident
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| posted on 23/5/04 at 11:02 AM |
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It can also be built for a lot less than £250 :-)
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Peteff
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| posted on 23/5/04 at 11:19 AM |
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50x3mm wall CDS would be the obvious. A place near me build one off 4x4 chassis in it and they don't break in a hurry. They bent me a roll bar
in it for £30 so it wouldn't break the bank either.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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pbura
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| posted on 23/5/04 at 02:35 PM |
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Found a Caterham newsletter indicating that they increased wall thickness from 2mm to 3mm a couple of years ago:
http://www.caterhamracing.com/downloads/newsletters/superlight240702.pdf
Pete
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PeterGT4
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| posted on 23/5/04 at 09:35 PM |
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Thanks for the replies and providing dimensions, its a big help!
I was thinking to be on the safe side, I was planning on using 2.5 x 0.188", but now, what has been provided here, looks like I'll be way
over-built... Perfect!
Cheers!
By-the-way, here's a picture of the complete model, which ended up costing around the Canadian equivalent of £250!
 
Rescued attachment SSeven23.jpg
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F1 Mini
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| posted on 23/5/04 at 09:47 PM |
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Thats a very straight tube is it not. Are the caterfields like that.
Most of the ones I've seen are bent round the diff.
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blueshift
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| posted on 24/5/04 at 12:09 AM |
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There was a thread on here a while back where cymtriks did his thang on the whole dedion tube material issue. various actual production tube sizes
were quoted I think.
a search for posts containing "dion" by cymtriks might yeild fruit..
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PeterGT4
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| posted on 24/5/04 at 05:27 AM |
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quote:
Originally posted by blueshift
...a search for posts containing "dion" by cymtriks might yeild fruit..
It did, except he spelt it "Deon"... No worries, I found them. Here's one of those threads:
http://www.locostbuilders.co.uk/viewthread.php?tid=5849&page=1
I also noticed a few times mention about lateral location devices. What are people's opinions of "Satchell Links"? Seems like it
would be better.
I have done as a test welding a gusset in the centre of the tube, like the Caterham's, and noticed a fair amount of distortion (as expected).
Would require straightening and I feel it would be alot of work, for nothing considering the Satchell Link pick-up's are at the ends of the tube
(where the trailing links would be and at least one of them still as you need one with a Satchell Link), leaving the rest of the tube un-disturbed.
Granted, Panhard's are still the easiest, but thought this would be different.
???
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PeterGT4
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| posted on 24/5/04 at 05:28 AM |
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quote:
Originally posted by F1 Mini
Thats a very straight tube is it not. Are the caterfields like that.
Most of the ones I've seen are bent round the diff.
All of the Caterhams feature a straight tube like that.
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dannyboy
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| posted on 25/5/04 at 12:49 PM |
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cateringvan de-dion
My seven is outside in the site car park. Rough scaling, using my scale rule gave an OD of approx 60mm.....very very roughly!!! and measured laying on
the ground in the dirt with a plastic scale rule!
However, if you are making a de-dion, the latest Caterham design is quite poor for the shock mounting. Mine is an older version and the shock mount is
through the centre of the de-dion tube. The latest ones have a lug at the base of the de-dion and there have been several failures! And they are
straight..well mine is ATM
Nice model BTW!!!
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PeterGT4
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| posted on 25/5/04 at 08:53 PM |
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quote:
Originally posted by dannyboy
My seven is outside in the site car park. Rough scaling, using my scale rule gave an OD of approx 60mm.....very very roughly!!! and measured laying on
the ground in the dirt with a plastic scale rule!
However, if you are making a de-dion, the latest Caterham design is quite poor for the shock mounting. Mine is an older version and the shock mount is
through the centre of the de-dion tube. The latest ones have a lug at the base of the de-dion and there have been several failures! And they are
straight..well mine is ATM
Nice model BTW!!!
Thanks. I noticed the poor mounting of the Caterham's shocks and was thinking for mine, I'd build a support/gusset off of the De Dion ear.
Should be better.
I built the model as a practice piece to building the real thing. Gave me the opportunity to practice painting. The nose cone and fenders feature five
coats of paint, that were wet-sanded between each coat, with a final hand polish and waxing.
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blueshift
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| posted on 26/5/04 at 01:01 PM |
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Location methods have been discussed too, and the conclusion was that there were better ways that panhard rod, but the difference was so tiny that you
might as well stick with panhard rod as it's simpler and a lot lighter.
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josty
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| posted on 23/6/04 at 02:34 PM |
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Why don't you build a completely independent rearsuspension when using independent rear diff.? Am I overseeing something?
What's the advantage of this methode compared to the double wishbone type like the Caterham or DaxRush?
A lot of questions...
Josty (Holland)
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JoelP
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| posted on 23/6/04 at 03:41 PM |
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quote:
Originally posted by josty
What's the advantage of this methode compared to the double wishbone type like the Caterham or DaxRush?
A lot of questions...
Josty (Holland)
theres a thread about this live at the minute. To summarise, with a dedion you dont get rear camber change under hard acceleration (squat affects IRS
setups). plus its very easy to make, IRS needs more fiddling, thinking and planning.
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