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Author: Subject: back bone chassis
smart51

posted on 29/11/09 at 07:07 PM Reply With Quote
back bone chassis

I know back bone chassies can be very stiff in torsion but isn't there a risk that they'll bend so that the wheels on one side are closer together than the other?

This particular car has a metal frame in the body tub for crash / rollover / side impact protection. Rescued attachment F16 chassis front.jpg
Rescued attachment F16 chassis front.jpg







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speedyxjs

posted on 29/11/09 at 07:13 PM Reply With Quote
Nice pic but i wouldnt be too happy having a crash in that, even if the body is 'safe'





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iank

posted on 29/11/09 at 07:29 PM Reply With Quote
I wouldn't even call that one a backbone. More two subframes connected by a small tube. A real backbone is much larger in cross section and often triangulated.

Like this:



or:



So in answer to your question, it depends on the strength of the backbone, but it's unlikely in a properly designed one while still being more likely than in a decent spaceframe/monocoque. In the one you show the body is going to have to be a decent monocoque to avoid it.

[Edited on 29/11/09 by iank]





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britishtrident

posted on 29/11/09 at 09:08 PM Reply With Quote
Nearly all backbone chassis are really only part of the structure the body stiffens them a lot.

The only backbone chassis I can think of that didn't transfer any chassis loads the body was the Triumph Herald.





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blakep82

posted on 30/11/09 at 01:09 AM Reply With Quote
here's aproper backbone chassis


that other one looks like it'll twist all over the place. i wouldn't go near it





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t.j.

posted on 30/11/09 at 07:01 AM Reply With Quote
quote:
Originally posted by smart51
I know back bone chassies can be very stiff in torsion but isn't there a risk that they'll bend so that the wheels on one side are closer together than the other?

This particular car has a metal frame in the body tub for crash / rollover / side impact protection.


The upper ball-joint mounting - wishbone looks tiny to me!





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MikeRJ

posted on 30/11/09 at 12:16 PM Reply With Quote
quote:
Originally posted by t.j.
The upper ball-joint mounting - wishbone looks tiny to me!


Stupendously under-engineered, much like the chassis IMO. I can't believe that is a finished design?

Perhaps the designer is planning for any slight wheel loadings to simply tear off the wheel before the entire chassis folds in half like a book?

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Benonymous

posted on 1/12/09 at 09:50 AM Reply With Quote
The front and rear sub-frames are going to be able to apply a huge amount of torsion to that wimpy "backbone". As it stands, I wouldn't even call that a chassis either. If the body is substantial and rigidly bolted to the sub-frames it might be OK but here in Australia the finished chassis would be subjected to a torsion test and the metalwork we see here would fail that miserably. I like the Lotus Europa backbone, even though they rusted like bastards!
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Daddylonglegs

posted on 1/12/09 at 10:03 AM Reply With Quote
No way would I even consider getting in that!

I reckon a few miles around where I live and the potholes would destroy it in minutes!





It looks like the Midget is winning at the moment......

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