Opinions please: Roll-over protection for a Marcos


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Ian Mantula
Ian Mantula
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Hello,
Be gentle I'm new here!

I have just started to consider some carbon fibre parts for my Marcos Mantula. The car needs various parts before it's finished. One of those was to be a steel roll-over bar. However, my recent discovery of the possibilities of carbon fibre composites got me thinking. Is it possible for an enthusiastic amateur to build a lightweight integrated crash structure that was genuinely capable of helping with protection? What I'm thinking of is a structure that was not obvious once the interior had been trimmed. When working with steel roll-over structures there is plenty of prior knowledge as to what works and what would fail. Can this be true with Carbon fibre composites, or is this a black art known only to a few? How would I learn?

In case you are wondering the Marcos is a GRP bodied two seater sports car with a steel chassis and in mine a 4.6 litre V8... The top of the chassis structure is at shoulder height.

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FLD
FLD
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Hi,

Firstly nice waggon!  My friend has a mantits (deliberate typo) which has just been supercharged.  With respect to your roll over bar I'd say it is possible in carbon BUT you'd need to test it to determine structure.  Even then it would only be known for the situation of the test.  This would be very costly.  As you say, steel is a known quantity which is why its used so heavily.  IMO you're best sticking with a steel roll over bar (yes I know its heavy) but your life may depend on it.  If you intend to race at all then it will have to be steel to pass scrutineering.

If you are trying to save weight the best option is to remove it from the body panels.  IIRC marcos jsut use GRP for panels so weight can be saved there.  There are other options if you need more weight savings.
Ian Mantula
Ian Mantula
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Thanks FLD,
That's what I thought. I don't intend to race, this will be a long distance, high performance touring car. The interior of the Marcos is quite small, so my idea was to add some protection without compromising too much on the space. Maybe something is better than nothing? 

Yes the Marcos does use very heavy GRP panels of rather poor fit so I've had to do a huge amount of cutting and filling to get them to look good. Carbon fibre panels are a definite future modification. 



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