other source
I've got a small book published by SAE entitled:Aerodynamics:Recent Developments,published maybe late 1980s/early 90s.
In the book,another marque,maybe Fiat ( I'll look) had a 2/3rd scale composite car model which could be assembled to create a myriad of car configurations.
What I remember off the top of my head ( and my memory is dubious ),is that they found no hard and fast rules,and air directed up or down or around could play havoc with the Cd,say lowering upper body drag while increasing under body drag.
I'll dig that out for tomorrow.
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