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Originally Posted by JulianEdgar
One of the misconceptions that has developed on this group is that there are plenty of old, low drag cars eg from the 1930s.
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I don't recall seeing anything like that, but I hadn't been here for years. Links for a thread or three?
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In fact, when they are tested in modern wind tunnels, I don't know of any at all. (The claims of the time are notoriously optimistic.)
There are old low-drag shapes - but not cars
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Someone in this thread claimed the 1922 Rumpler yielded a 0.28 cD when tested in a modern wind tunnel!
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Modern cars are the ones to look at if you want to gain lessons in low-drag design - today's cars are lower in drag and lift than any production cars that have come before.
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You mention "production" cars quite a bit- I don't know why.
Do you consider the 1954 Fiat Turbina, with its claimed 0.14 cD, to be a modern and/or production car?