roll bar
Hi 2 all
I have a query regarding the roll bar bracing bars, I was wondering if there is an IVA requirement to have these, personally I would like to leave them off! other builders seem to do without, so if anyone can point me in the right direction............ may the force be with us |
Depends if you have your seat belts mounted to the roll bar or not.
If you mount your seat belts to the horizontal bar at the bottom of the roll bar then you need to have either front or rear roll bar stays. How ever if your seat belts are mounted to some where like SB2 , RS4+5 ect then you don't need front or rear stays. |
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David |
One thing to consider other than iva is if god forbid you roll it I personally think from a safety point of view the more bracing the better as the roll really is the only thing stopping your head hitting the floor
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Mark from billingham passes without rear stays, his harnesses are mounted on the roll bar cross member. I have seen loads of mnr's on the road the same. Mounting to the seat back rail is a pita as its quite low, but a lot of manufacturers do, mk for one. Better to mount on the rollbar to get a bit of height behind the shoulders, harnesses should never be mounted below shoulder height. At the end of the day, its your choice, some iva testers may not like it, i dont know. Better to be on the safe side, or even better to keep it shiny side up:D
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Quote:
Bob |
Quote:
http://www.securon.co.uk/fitting/ext...essfitting.htm FIA requires, conversely, that harnesses are never mounted above shoulder height. |
i stand corrected, i hadnt seen this. Il look tonight but i was sure the iva cotradicted that. If im wrong il keep my mouth shut, not right about much these days.
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http://daliracing.com/v666-5/downloa...eplacement.pdf
. Either your link is way out of date or manufacturer is not bothered what happens to the body during an accident. Im sure iv also seen some proper reseach into this, il keep looking |
Best not to confuse FIA requirements with IVA requirements, they frequently contradict.
D. |
seems daft doesnt it? Obviously FIA spend a lot of money on reseach and see the result of a lot of accidents so does mr vosa have alternative research or is he just making it up as he goes along? Would it not be better to have One rule for harness fitting accross the board?it is a pretty crucial piece of kit afterall
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I think the fia and the associated rules are developed with the view things like track/rally cars stand more of a chance of being the wrong way up:eek: :eek: . Road cars dont have to fulfill this criteria so if you want extra safety build it in yourself.
Bob |
I've seen somewhere that the recommended height is 10° below shoulder height. The rationale is obvious: it's so that if you roll upside down, your body does not sag as much, while the spine compression in the event of a frontal impact is minimal.
IVA does not have a lot to say about the position of seatbelt mounts, just that they have to be 45 cm above the reference brick on the seat (IVA 31.16). The 550 mm high chassis seatback rail is high enough only for very low seats, most seats with runners cannot be so low. |
roll bar
:) thanks everyone for your opinions, i now have options and choices.
I also take your points about safety. |
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