any one see any major problems with this quick design?

i got the cad of the gts locost build site which i then opened in pro desktop but decided be far simpler to draw the bits on in paint tried my best to make it was done in prodesktop tho



[Edited on 16/3/07 by goodall]
Rescued attachment hardtop chassis.JPG

i see what you mean but i like the seven shape with the long bonnet and the relatively short cabin, its what attracts me to it

tweeked the design a wee bit more
Rescued attachment hardtop chassis.JPG

Have been planning something very similar myself - a-pillars as you've drawn connected to the rollbar with a )( shaped backbone. Having a-pillars rather than just channel to hold the glass would be pretty much a full roll cage - much safer, perhaps a fair bit stiffer too? The detachable lid with doors attached would just be fibreglass and perspex and would then fit over the top if i ever got round to making it.

Looks good to me!

You need to optimise for torsional rigidity and the easiest way to do that is to build a wooden model and twist it in your hands.



What you will quickly realise is that you need to triangulate especially across the engine bay. You will also realise that the windscreen opening is a weak spot and the A pillars at the base of the windscreen.

If you going to do a BEC that doesn't have to look like a 7 then shove the engine in the back and do away with prop shaft live axle rubbish.

Look at this over on the middy section for example there are other people traveling the same road as you.

JB - The frame look the dogs.

I'm planning on bonding the windscreen to 20mm SHS welded inside the the front roll tube - 'A' pillar frame as per modern car methods this'll stiffen up the area nicely. Unless of course I've got the math wrong in which case I'll have a broken windscreen, we shall see.