[alfa] [Non-Alfa] Non-glass transparencies

[Joe Elliott]

Question for the racers out there:  What kind of material do you use 
when making non-glass 'glass' for your race cars?  Is there anything 
out there that's easy to machine, relatively scratch-resistant and 
doesn't require special solvents be used to clean it?  (Aerospace 
industry acrylics are really sensitive to the wrong solvents...)  The 
rear vent windows on my brother's R5 (no, not a Group B R5, this 
one's a period electric drivetrain conversion by a U.S. Electricar 
Corp. of Massachusetts) have come unglued (!) from their hinges, and 
besides trusting rearview mirror adhesive to keep the glass attached 
to the car, machining new ones out of polymer (I have access to 
someone who has access to a CNC router) that can be drilled and 
bolted to the hinges seems like the only robust way to fix it.  And 
saving a few pounds won't hurt either--that thing needs all the help 
it can get to attain 55 mph.

Thanks in advance,
Joe Elliott
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