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Discussion Starter · #1 ·
Very intresting.

I did this in case I or a new owner of my car ever would
like to get a CARS log book since I have 1.5" rather than 1.75" tubing.

I think I should talk to the eng some more about the details
and it might be fun to model other loading than what the rule book
looks at but here are the main points per the loads from the CARS book:

The joints are pelnty strong even with out gusets.

The main hoop is also lightly loaded and the V in the hoop is not
adding much if anyting to the structure.

A bar from the top of the a-pillar to the base of the door hoop is
likely a good idea in most newer cars that have a lot of winshield rake.

In this image, loads are % of code safe working load with 1.00 = 100%

http://www.11tenths.com/graphics/cage-load.jpg
 

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Admittedly, I am not in the know of SCCA versus CARS rules, but what is different about your cage that makes it fit both series?

I am about to embark on an historic rally project that I want to run in whatever US series there is, as well as Canadian CARS rallies. The work will begin in the next few weeks, and any links or help is appriciated.

I do not have the pro rules, nor the CARS rules, but need to understand the specifics that will make running in both countries as easy and painless as possible.

Thanks,
Steve
 

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There are many people here who are more qualified to give an answer than I am, but I think that your best bet might be to build your cage following all FIA specifications and diagrams etc. You can find all the necessary information at the fia website (www.fia.com). I could be wrong though, so wait for other opinions before spending your money. :)
 

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>In this image, loads are % of code safe working load with
>1.00 = 100%


Derek,

Very cool.

Can you clarify what is meant by "code safe"? Which code or rules?
Also, do you know if he used a factor of safety?

Thanks,
Rich Smith

Vive le "Pro-le-Ralliat"
 

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Discussion Starter · #5 ·
Rich he used the typical safty factor of 100% stronger than needed[br]

I am not sure what code he used but it was a standard one for doing [br] things in high carbon steel ie 1030, and also standard for the welds.

I expect some of the more anylitical types will ask questions here and [br] depending on request I may see what happens when we change the [br] model a bit or impact trees in the center of the door bar...

But all that cost money.

For the CARS rules they require a 1.75" main hoop, that is about it for [br] things not the same.

Derek
 

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Discussion Starter · #7 ·
I got a call my web site was down thus the image was not showing, well it is working again.

As to the program, ask the engineer not me.

Derek
 
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