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"This pseudo-tail [used on the Tatra 87, VW Beetle, Volvo PV544, etc.] wasn't that fast [i.e. low drag]! On the contrary, it was characterized by a particularly high air resistance. And that met with incredulous amazement.
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Are you sure? Compare the Beetle and the Tatra. The Tatra has elephant ear-sized scoops on the rear quarters to capture engine-cooling air. The Beetle has surface vents below the rear window.
Somebody knew about those vortexii.