Mr Whippy
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| posted on 23/5/08 at 01:53 PM |
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Roll cage requirements.
I’m going this weekend to start measuring up and drawing the roll cage in CAD as I need it fitted to install the steering column and doors (both are
to be mounted on it). I want it to be suitable to be used in sprints and hill climbs but am not sure on things like minimum radiuses harness
requirements, cage bolt down requirements etc etc
Would anyone have a computer document of the regulations handy?
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garage19
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| posted on 23/5/08 at 02:01 PM |
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From memory material for main hoop has to be either 45 x 2.5 mm CDS or 50 x 2 mm CDS to comply to MSA regs.
Cost is about £12 meter for the 50mm.
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Mr Whippy
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| posted on 23/5/08 at 02:25 PM |
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cheers 
One thing that is bothering me is the tight radius around the windscreen area and I don’t know how tight I can get away with. Plus I want to mount the
cage to the body shell (which is glassfiber) with bolt through plates rather than cut huge holes in the side. I was going to have plates and internal
cage down to the chassis rails inside, the front internal frame basically a hoop and the steering column and mounted to the top tube. Any ideas on how
best to go about this would be helpful.
Current working ‘technical drawing  ’ badly photographed below -
 
Rescued attachment falcon bodywork.jpg
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blakep82
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| posted on 23/5/08 at 02:33 PM |
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mmm, bolted to the chassis will be a noooo. even if its bolted to another frame underneat i think. pretty sure it has to go the the chassis rails
directly. i used to have a copy of the blue book as well, think it got thrown out ages ago. it was well out of date even then.
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Mr Whippy
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| posted on 23/5/08 at 02:41 PM |
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well I don't have any head room inside for a cage, I can barely get in at all with the hood up so was wanting to put the cage outside, but not
wanting to have some huge monstrosity dominating the whole car.
[Edited on 23/5/08 by Mr Whippy]
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Richd
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| posted on 23/5/08 at 02:59 PM |
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The main strength of the cage (and for that matter the driver protection) is in the main hoop over the drivers head. So that one needs to be down to
the main chassis rails. as i understand it the rear bars are already down to the chassis rails at the back.
The front cage is, I think, optional for sprints but if fitted would need to be somewhere substantial, ie chassis leg.
If the main hoop isnt down to the chassis rails the whole cage will tend to fold on a heavy impact.
All this is without looking at the blue book so may in fact be total bo11ox.
Cheers
Rich
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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mr henderson
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| posted on 23/5/08 at 04:37 PM |
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quote:
Originally posted by Mr Whippy
One thing that is bothering me is the tight radius around the windscreen area and I don’t know how tight I can get away with.
How are you going to do the bends, surely the radius achievable will depend on the bending device?
John
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neilj37
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| posted on 23/5/08 at 04:45 PM |
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if you are worried about the tight radius at the windscreen, instead of having a hoop at the front, why not take the cage from the back down to the
sides at the front and then brace across at the windscreen.
Hope that makes sense ??
[Edited on 23/5/08 by neilj37]
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hughpinder
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| posted on 23/5/08 at 04:48 PM |
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Isn't there a minimum bend radius thats allowed? IIRC 20 cm- looks like your screen front bend is too tight. The top of the cage must be 5 cm
above the top of your helmet, and less than 16cm behind the back of the helmet. The tube to be 50*2 or 45*2.5 CDS. (1.5" schedule 10 = 48*2.11
is this ok?). I think there is a spec on the amount of ovality that you can have after the tube is bent (90%??). All IIRC.
Hugh
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Mr Whippy
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| posted on 23/5/08 at 05:29 PM |
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quote:
Originally posted by neilj37
if you are worried about the tight radius at the windscreen, instead of having a hoop at the front, why not take the cage from the back down to the
sides at the front and then brace across at the windscreen.
Hope that makes sense ??
[Edited on 23/5/08 by neilj37]
actually that makes a damn sight more sense that my daft idea
Good thinking batman
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matt_claydon
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| posted on 23/5/08 at 05:50 PM |
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Try this link for the relevant part of the blue book: http://www.msauk.org/uploadedfiles/msa_forms/bluebooks/152-184%20Competitors%20Safety.pdf
Might not work for you as I have a login, but worth a try
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Mr Whippy
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| posted on 26/5/08 at 11:08 AM |
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quote:
Originally posted by matt_claydon
Try this link for the relevant part of the blue book: http://www.msauk.org/uploadedfiles/msa_forms/bluebooks/152-184%20Competitors%20Safety.pdf
Might not work for you as I have a login, but worth a try
Got in without a password, thanks
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