Here is a drawing from
Piechna's book. It is based on a paper by Buchheim et al.[1]. It shows how the coefficient of drag (Cx) is influenced by the ratio of the height of the stagnation point (Hsp) to the height of the car (Hnadw).
[1] Buchheim R., Leie B., Luckoff H.J.,
Der neue Audi 100- Ein Beispiel fur Konsequente Aerodynamische Personenwagen-Entwicklung, ATZ 85, 1983, pp.419-425.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread