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Old 01-16-2022, 01:55 PM   #177 (permalink)
freebeard
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Have you looked at the GTI W12-650?



Flying butresses and an internal duct for downforce.

I made this design for a VW Beetle.



The dashed line inside the leading edge is a Dyson/Jetoptera type Coanda duct using engine cooling air to generate thrust. I have the Beetle but no way to fabricate one.

For sheet plastic I would look for a polymerized coating of some sort, possibly hydrophobic.
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