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When asked about how a car with a flat front end, or flat windshield can still have good aero, he replied that you can have good aero if you curve the edges on a "barn door" at 80% flat to 10% curved.
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My go-to example is always the Beetle. If you compare the contour around the windshled's changes from the 1950s through the 60s, you can see this. The windshield grew but the bootom edge didn't move. The contour radius in the upper corners did.