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-   -   Wishbone made of box section? (http://www.haynes.co.uk/forums/showthread.php?t=14149)

jason 82 2nd February 2018 01:13 PM

Wishbone made of box section?
Hi, I have just noticed that Rally design do box section wishbones for the locost & they are really cheap. Is there any reason why I can't make one's from 20mm seamless box section with a 2mm wall ? I am mainly concerned about clearance issues as the area is a little bigger. Assembly should be easier as well. I hope !

Ricky 4th February 2018 07:04 AM

Hi are you on the Facebook group if not you should join maybe you can get more answers there . But to answer your question I'm not entirely sure but think seamless tubing I think is a bit over kill cause here in south africa they race them and they use normal 1.6 mm round tube and they happy with it

jason 82 4th February 2018 10:28 AM

Thanks for that, it's appreciated.

jason 82 4th February 2018 10:58 AM

I have put a request up on the group now Thanks, I just need someone to accept my request if that's possible?

Ricky 4th February 2018 11:45 AM

Ok it's the haynes roadster group I think just give it some time the admins will add you

voucht 4th February 2018 06:12 PM


Originally Posted by jason 82 (Post 105839)
Hi, I have just noticed that Rally design do box section wishbones for the locost & they are really cheap.

Hi Jason,

Sorry but no, Rally design's wishbones are not made of box section tubes, but "Flat Oval Section" tubes, which is completely different.

DAR002prod by Sylvain ROIG, sur Flickr

ERW_Welded_FS_Oval by Sylvain ROIG, sur Flickr

A lot of wishbones are made of flat oval section tubes tubes, as they are more aerodynamic (I know, not a major issue for our seven-like car!), and also, look neater than round tubes.

Honestly, I have never seen box section wishbones, I'm not sure it exists, so perhaps there is a good reason for that. And, if it has any importance, it will not look good either (imho :) ).

And I as said above, seamless tubes might be a bit overkill, but I would use at least ERW steel tubes for my wishbones.

Hope this will help :)

jason 82 4th February 2018 06:19 PM

Thank you Sylvian, that's spit on thankyou. I may try the oval tube to be a little different.

voucht 4th February 2018 06:23 PM

Thank Jason,
If I has to redo my wishbone (or build another Roadster :rolleyes: ), flat oval section tubes would definitely be my choice too :) .

Ricky 4th February 2018 07:07 PM

What is the size used on that over pipes is all the wishbones the same or what

voucht 5th February 2018 07:50 AM

I'm sorry Ricky, it should be my bad English, but I don't understand your last question. Could you please reformulate? (some comas and dots might help as well :) )

Ricky 6th February 2018 06:10 PM

Sorry auto correct is a problem . Here is the question the ovel tubes you use on the wishbones what size is it outside diameter and thickness and is this same size use on all the wish bones ?

voucht 6th February 2018 10:29 PM

Hi Ricky,

Thanks for having taken the time to re-write your question.

Actually, my wishbones were not made with flat-oval section tubes, but with round tubes as per the book (they come from Talonmotorsport)

The pictures I published above are the wishbones for Locost sold by Rally Design (not suitable for Haynes Roadster), to show Jason that they were not made of square section tube, but of flat-oval section tubes.

I have no idea what are the dimensions of the tube they use.

If I had to made a new set of wishbones for me, with flat-oval section tube, I will try to find what is the strength equivalence of the round tube used for the book wishbones in flat-oval section tube, like in a simulator such as you can find on internet.

Hope that answer your question :)

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