Quote:
Originally Posted by AnalogMan
At a minimum, how about a large removable sunroof, such as used to be available on the Porsche 924? I think that by leaving the perimeter roof channels intact, most of the structural integrity of the body is maintained. I don't think the sheetmetal in the middle contributes much.
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A continuous (i.e. no sun/moonroof-hole) thin, lightweight shear panel contributes a LOT to torsional stiffness, while weighing practically nothing. Putting a big hole in the roof requires a somewhat massive frame around the hole => heavier with less torsional stiffness. Also more $$$.