we wonder whether fibreglass or GRP or AL with carbon fibers is most suitable to be ued as material of bodywork of a formula student race car?

We used just fiberglass last year and had no problems with it. (except that it wouldn't release from our moulds) It is pretty lightweight, and plenty strong, and left us a nice surface to put on our sponsors logos.

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UVIC Formula SAE Team

http://www.engr.uvic.ca/~fsae