No, not a crash vid.
Reading the draft IVA manual (and assume it was the same in SVA), the seatbelt mounts need to be able to withstand a force of 20x your body weight.
I am planning to make my top anchor points on my rollbar tomorrow but am a bit concerned about the fact that there is 8 bolts holding my rollbar to
the chassis (4 each side).
Is this likely to be a fail point due to not being strong enough?
Cool, cheers
Go up a bolt size if there's enough meat in the plates and you're worried.
I'd agree you should use 8.8 absolute minimum anyway for a roll bar.
Go for cap head bolts, they are usually 12.9 grade and not expensive. They also look nicer in my opinion.
Cheers,
Craig.
My original Tiger one is only two 8mm bolts each side.
Does your roll bar have back stays ? If not some testers argue that it's not strong enough to be used for the seat belt mountings.
Roger
quote:
Originally posted by HOL
My original Tiger one is only two 8mm bolts each side.
Yesterday i was fitting the roll hoop to Surtees TA14, and that was a simple two legged hoop afair, with one 7/16 bolt through each leg and through a chassis tube inside the leg. Not sure if that makes sence, and they are in double shear, not tension, but it might give an idea.
quote:20x what weight? I was always told that some of the strange but definitive measurements in the SVA were down to the fact that it wasn't only "you" that might drive the car. Get a jockey to present your car for the IVA?
Originally posted by speedyxjs
No, not a crash vid.
Reading the draft IVA manual (and assume it was the same in SVA), the seatbelt mounts need to be able to withstand a force of 20x your body weight.
I am planning to make my top anchor points on my rollbar tomorrow but am a bit concerned about the fact that there is 8 bolts holding my rollbar to the chassis (4 each side).
Is this likely to be a fail point due to not being strong enough?
quote:
Originally posted by Richard Quinn
quote:20x what weight? I was always told that some of the strange but definitive measurements in the SVA were down to the fact that it wasn't only "you" that might drive the car. Get a jockey to present your car for the IVA?
Originally posted by speedyxjs
No, not a crash vid.
Reading the draft IVA manual (and assume it was the same in SVA), the seatbelt mounts need to be able to withstand a force of 20x your body weight.
I am planning to make my top anchor points on my rollbar tomorrow but am a bit concerned about the fact that there is 8 bolts holding my rollbar to the chassis (4 each side).
Is this likely to be a fail point due to not being strong enough?
Its quite interesting that most other body protection is designed to give progressively i.e. crash boxes and side impact protection but seat belts
seem to have very little give in then. I thought about this when struggling to decide how to mount my crotch straps. I took the view that I would
rather have the crotch straps pull through about 4 mm of alley than pull through my goolies! javascript:icon('
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I would worry less about bolts snapping and more about what they are attached to. A big bolt through a small sheet is a waste of space. Many small
bolts may spread the load better than 1 big bolt.
I think it was Colin Chapman that used to quote, you can hang a double decker bus on a 1/4" bolt when people queried his fragile looking F1 cars.