I wonder if you could get a 14" or 15" saucepan, fix or clamp the plexi to the top somehow and boil it so the steam pressure blew the plexi out to a suitable shape...
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
I made some plexiglass potplant holders using the original ceramic plant pot standing in a large saucepan filled with water and the plexiglass disc sitting on top.
After boiling the water the plexi was slid in and another ceramic plant pot was pushed inside the first thus forming the plexi into the desired shape.
This was so a demonstration could be made to show how plants grow. It was aimed at preschoolers so a high quality was not as important as a simple and easy to understand display.
Those caps don't look so bad for air drag and you get some ventilation for the brakes too. My mags were much deeper . . . still may spin them with an electric motor and see the air drag difference later this year just to find out what they cause for drag.
Beef - I didn't know that it would only improve mileage by a few tenths but I really appreciate all the feedback.
I have seen documentation on another site of 1 to 1 1/2% improvement with full moon discs. Again each car is different. I have alloy rims on my Q45 and am looking to do something clear also