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You are on the right track but there is much more to it. The Type I Beetle is a high drag shape (Cd 0.48) with lots of lift. Compare it with the Audi 100 (Cd 0.31) back when SCCA started its Show Room Stock Class 40 years ago. The Prius is down to Cd 0.26 last I heard and the Aptera 3 wheeler is based on Dr. Alberto Morelli's Cd 0.05 "ideal" shape. I recommend "Race Car Aerodynamics: Designing for Speed" by Joseph Katz PhD. The math is high school algebra and there are lots of pictures and graphs. Also check the Wikipedia entry for NACA wing shapes.
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