Quote:
Originally Posted by Phase
i probably wont need THAT much in material for the rear spoilers. im mostly looking at abs for the undertray, unless you have some suggestions
spoilers will probably need to be a bit stiffer since they can only be mounted at the tip of the car
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ABS is just a 'diaphragm.' It has no strength to speak of.
Typically, it's vacuum-thermo-formed over some tooling which either creates 'ribs', or compound-curve 'egging' to resist deformation. Its natural frequency must never be experienced while in service.
Aeroelasticity would be a real thing at 80-mph!
The pieces of car bellies I find laying in intersections with 'dips' all have a fiberglass pre-form embedded within the sheet-plastic matrix. They aren't 'flat.' Always 'curves', or 'fins', 'ribs', or submerged NACA inlets molded in as stiffening 'corrugations.'
Coroplast or sheet metal might be better for underneath. And with a bonded reinforcing structure behind them.
Lots of examples here and elsewhere.
