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Roll hoops V cage SVA help
joolsmi16 - 6/12/08 at 03:14 PM

Hi all, having started to work on the top seat belt anchorage today I'd thought I'll have a read of the manual.

My build is a all tube chassis with 25mm with two main roll hoops of 34mm * 3mm thick fine I thought until I read in the manual steel chassis with anchorage on roll cage which states the roll cage should ideally be manufactured of CDS 45mm x 2.5 or 50mm x 2mm wall!!???

My question .... are my roll hoops considered a roll cage as I will need to replace with larger dia CDS! Rescued attachment HPIM2301.JPG
Rescued attachment HPIM2301.JPG

joolsmi16 - 6/12/08 at 03:15 PM

Rescued attachment HPIM2302.JPG
Rescued attachment HPIM2302.JPG

joolsmi16 - 6/12/08 at 03:16 PM

Rescued attachment HPIM2301.JPG
Rescued attachment HPIM2301.JPG

mark chandler - 6/12/08 at 03:51 PM

The sizes you quote are to meet MSA/RSA spec roll cages, for SVA what you have should be fine.

Regards Mark

joolsmi16 - 6/12/08 at 04:09 PM

Hi Mark, I've never checked the manual before for roll cage spec but it does state the 45 and 50mm diameter.

Iam hoping that because they are roll hoops welded to about 40 different point to my chassis and not a full cage the bolts on I;ll be ok its a lot of work if Iam not!!!.

Cheers

blakep82 - 6/12/08 at 04:39 PM

i think (if you're quoting) the word 'ideally' is the key

joolsmi16 - 6/12/08 at 04:56 PM

I would like to think they'd be okay as they are in integrated part of the chassis structure and not a bolt on item or welding on top of.

The "ideally" in the manual does help at all if a roll cage need to be of a certain spec then print it.

mark chandler - 6/12/08 at 06:01 PM

As there is no requirement for a roll cage in SVA its academic anyway.

The rules are around height and bolt type/bolt fixing.

Building to MSA/RAC spec means that you can enter timed events or race with the car. If you only want to drive on the road/track days and you are happy with the construction you are fine.

Regards Mark

dhutch - 6/12/08 at 06:42 PM

quote:
Originally posted by mark chandler
As there is no requirement for a roll cage in SVA its academic anyway.

The rules are around height and bolt type/bolt fixing.

Building to MSA/RAC spec means that you can enter timed events or race with the car. If you only want to drive on the road/track days and you are happy with the construction you are fine.

Regards Mark

Looks a very interesting car.
- Is there going to be any for/aft bracing on the forward hoop?

joolsmi16 - 6/12/08 at 06:47 PM

Lets hope the "ideally 45 or 50mm" as stated in the manual does'nt mean has to be...

As far as bracing for the front hoop did'nt plan on any, however could run a tube from top of front to top of rear..

Thanks for all your reply, I'll keep my fingers crossed.

Jools

nitram38 - 6/12/08 at 10:54 PM

The F1-2 passed like this, but my seat is narrower and more braces than in your picture:

rollhoop
rollhoop