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As a former pilot (!) of hopped-up VW Type 1s, the multiplicity of compound curves creates significant lift (i.e., drag) in motion. An old Beetle at speeds over 80mph offers about as much excitement as one can tolerate. I have always wondered how much of the lift on these interwar streamliners could be tamed with a modern aerodynamic undertray. I have noted the Rosemeyer record car appears to have a rear diffuser (for all the good it did him).
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