Quote:
Originally Posted by aerohead
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.  |
Well Julian Edgar suggests abs for the underbelly with a steel skeleton frame welded into it so it holds shape. So that was the route I was looking into. Not just pure wobbly abs or acrylic by itself