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You have to engineer such a structure from 2 perspectives. IN the roll over situation, deformation needs to be limited to protect the occupants. An element of energy absorption is also needed.
THe crash structure on an elise is mostly bothered with the later. It works by absorbing energy through its own destruction. It is entirely outside of the "safety cell" so it doesnt really matter if the structure is destroyed in the process.
A roll structure has the difficult job of both roles. Primarily energy absorbtion is sacrificed for sheer strength to protect the safety cell, but some absorption is necessary.
There is no reason why a composite roll over protection system isn't doable. As proven in F1 and certain other high level motorsport, it is possible with the research and development.
Problem of that is the cost and man hours to get it right.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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