Barksavon
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| posted on 29/3/15 at 06:25 PM |
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DIY Roll Cage
Did our first track day yesterday at Blyton....dont think it will be our last. However when i was passengering i felt very exposed in our Tiger Avon
without a roll cage. Also when we looked at the photo's we had taken it was very noticeable that the top of my lads crash helmet is higher than
the height of the standard rollover bar.
Ive read the posts on here about all the rules and regs about roll cages for racing but this car will not be used for racing so i was wondering
whether anyone has any info on DIY roll cages. Ive seen some photo's in dave1888's photo archive where he appears to attach the front hoop
to the chassis by bolting through the body panel . I am reasonably profficient with a mig welder so would like to have a go at building my own if i
can
Any views or advice welcome
Thanks
Ian
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mark chandler
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| posted on 29/3/15 at 07:30 PM |
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This was my front hoop, i subsequently gave it away as not MSA standard
It bolted through to the frame, It was made from 1.5" CDS, I designed it then ordered from a chap on eBay as a flat pack, I think this is him
http://www.ebay.co.uk/usr/tube-bender?_trksid=p2047675.l2559
This was the design I wanted
It cost around £70 delivered, then got welding.
to land on the existing frame easily would have required a lot of work, pulling off the panel etc so I mounted on the outside, cut a 1.5" end of
tube, capped it with 1/4" to plate then drilled through the plate to bolt to the frame inside.
The bolt a then hidden in the tube.
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coozer
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| posted on 29/3/15 at 07:56 PM |
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Here's mine, two triangular plates welded to the junction of chassis tubes on the floor, two bits of bar fitted into the tubes with an M10
thread down the middle, two 10mm internal diameter tubes welded into the existing cross bar and job done!
If you need any more photos let me know...
http://www.locostbuilders.co.uk/viewthread.php?tid=154122
1972 V8 Jago
1980 Z750
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minitici
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| posted on 29/3/15 at 08:18 PM |
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If you are considering doing any MSA speed events (Hillclimbs or sprints) then from 2016 all "Road going - Specialist Production Cars"
will require a ROPS which complies with the requirements set out in the MSA Blue Book.
A "Locost" type Seven would fall into this category.
If you are making a cage you would be best to follow the blue book requirements.
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Doctor Derek Doctors
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| posted on 30/3/15 at 12:00 PM |
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The thing is that all of the MSA rules and regs are there to insure that the Roll cage is safe, so if you are making your roll cage to improve the
safety of you car then following the MSA rules and regs is probably the best place to start.
The blue book is availiable to read for free on the internet or as every member gets a new paper copy every year somebody would probably donate a 2014
or older version
This is probably the clearest picture of my cage:
 
Description
This has full FIA homologation and to be honest isn't really any more complicated than the non MSA cages I have seen. Also the small extra cost
to make a proper cage would easily be offset by the increased value when/if ever you came to sell the car by having a proper approved cage.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
Plans and Drawings available, U2U or e-mail for details.
Available Now: The Sports Racer Add-On pack, Build a full bodied Sports Racer for Trackdays, Sprints and Racing.
www.t89.co.uk
www.racecarwings.co.uk
callan@t89.co.uk
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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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DJT
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| posted on 30/3/15 at 12:53 PM |
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I've got the Caged Laser cage on my Avon. Very pleased with it. Tiger did a good price for me, so always worth asking them. If I'm
honest it is a little heavy and could maybe be narrower tube, but it's not a competition car and it feels a lot more rigid and safe now.
Happy to provide any reference measurements, etc. if you go your own way.
http://tigeravonbuilddiary.blogspot.com/
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Barksavon
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| posted on 30/3/15 at 08:38 PM |
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Thanks for the replies. 'Doctor' did you make your cage? I see you're in Derby, I'm in Ripley, would it be an option to come
and have a look. I agree re the regs as I am fitting the cage for safety so I might as well make sure its capable of doing the job. I will try and do
a drawing of what i have in mind and post it on this thread for any opinions as to whether it will comply with regs
Thanks again
Ian
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Barksavon
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| posted on 1/4/15 at 10:52 AM |
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Am I missing something here? I've looked at the regs in the blue book and it talks about mounting feet on the legs of the main and front
rollbars and on the backstays bolted to plates welded to the chassis (section1.3.2 and drawings k13 -18) I then look at the race cages on the Tiger
Racing website and their cages appear to be bolted to the chassis from the outside of the body shell - Do the Tiger cages comply with the regs?
Ta
Ian
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DJT
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| posted on 1/4/15 at 10:58 AM |
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I assume so. You'd may be best to ask some of the Tiger owners that race, perhaps on the ToC forum.
As the Avon cockpit is quite narrow, I doubt there'd be any room to mount the front cage uprights inboard of the side chassis rails.
http://tigeravonbuilddiary.blogspot.com/
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Doctor Derek Doctors
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| posted on 1/4/15 at 12:36 PM |
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quote:
Originally posted by Barksavon
Thanks for the replies. 'Doctor' did you make your cage? I see you're in Derby, I'm in Ripley, would it be an option to come
and have a look. I agree re the regs as I am fitting the cage for safety so I might as well make sure its capable of doing the job. I will try and do
a drawing of what i have in mind and post it on this thread for any opinions as to whether it will comply with regs
Thanks again
Ian
Hi Mate, no the cage is from Caged but you are welcome to come and have a look at it if you want. Just U2U me and I can let you know if I am about.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
Plans and Drawings available, U2U or e-mail for details.
Available Now: The Sports Racer Add-On pack, Build a full bodied Sports Racer for Trackdays, Sprints and Racing.
www.t89.co.uk
www.racecarwings.co.uk
callan@t89.co.uk
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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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Barksavon
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| posted on 1/4/15 at 09:13 PM |
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OK mate ta.
Just to confuse things (for me) even more I spoke to a very pleasant chap at Mac 1 Motorsport today who told me a cage made in ERW tube (with a welded
seam) is OK if the car is to be used for sprints and hillclimbs and I would only need a cage made from CDS (as per the blue book) if I want to race in
such as the 750 series etc....aaargh my head hurts!!!!
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mark chandler
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| posted on 1/4/15 at 10:18 PM |
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You just need a rear hoop for sprints and hill climbs, mine was signed off last year, because its a little engine it did not even need the diagonal
just stays. Drawing no.1 although I followed drawing no.60
Minimum Material
Cold Drawn Seamless Unalloyed Carbon Steel, containing a maximum of 0.3% of carbon.
The blue book calls for the legs to land on 3mm plates, not what the plates are fixed to. if you wanted to you could land the front hoops on bits of
angle bolted into the frame although you have to consider how safe would I be?
1.3.2. Mounting of ROPS to the Bodyshell. Minimum mountings are:
1 for each leg of the main or lateral rollbar. 1 for each leg of the front rollbar.
1 for each backstay (see 1.3.3).
Each mounting foot of the front, main and lateral rollbars must include a reinforcement plate of a material of at least the same thickness as the wall
of the tube to which it is being welded
(minimum 3mm).
Each mounting foot must be attached by at least three bolts, minimum M8 150 grade 8.8, on a steel reinforcement plate at least 3mm thick and of at
least 120cm2 area which is welded to the bodyshell (see drawings K13 to K18). The mounting feet may alternatively be welded direct to the
reinforcement plate. This does not apply to backstays (see 1.3.3).
1.3.3. Backstays. These are compulsory and must be attached near the roofline and near the top outer bends of the main rollbar on both sides of the
car. They must make an angle of at least 30° with the vertical, must run rearwards and be straight and as close as possible
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Barksavon
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| posted on 2/4/15 at 07:24 AM |
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OK Mark cheers that's helpful. Its contrary to what the guy at mac1 said re the grade of tube so if I go the diy route will play it safe and go
with CDS
Ian
[Edited on 2/4/15 by Barksavon]
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Doctor Derek Doctors
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| posted on 2/4/15 at 08:50 AM |
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If you do decide to pop round I have a couple of old copies of the MSA Blue Book if you want one.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
Plans and Drawings available, U2U or e-mail for details.
Available Now: The Sports Racer Add-On pack, Build a full bodied Sports Racer for Trackdays, Sprints and Racing.
www.t89.co.uk
www.racecarwings.co.uk
callan@t89.co.uk
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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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cliftyhanger
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| posted on 2/4/15 at 09:02 AM |
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I think there is a lot of "that will be fine" talk from some people, but having rolled a convertible (with no bar) I am a bit tetchy about
all this. So if you are taking safety seriously, follow the blue book and don't skimp anywhere. My "new" car (spitfire with a zetec
and dunnell efi) has a heavy rollbar with a diagonal. I am also hoping that lightning doesn't strike twice!
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FuryRebuild
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| posted on 2/4/15 at 09:24 AM |
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you want this beauty (link)
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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Barksavon
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| posted on 3/4/15 at 10:07 AM |
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Thanks Doctor, ive downloaded a PDF of the 2015 book so i'm sorted thanks.
Seems to me that thereare various designs depending on what type of car but to comply with MSA Blue Book the cage has got to be made of CDS (and not
ERW) tube.
I want the cage for the safety of my lad and myself primarily so wont be cutting any corners.
Thanks for the advice
Ian
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