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Concerning the kammback I have read different figures about how to design it properly but I´ve got the impression that a slope of maximum 20 degrees on each surface is a good start. In some places I have read that the teardrop-shape should continue for at least 3/4 of the length of a full teardrop. At other places I have read that the area of the flat end should not be more than 50% of the maximum projected frontal area of the entire car.
If this is a good route to follow we can easily look at the streets to se that few car manufacturers follow this recipie. I guess this can be explained by avreage people not knowing what difference it can make and that most people still would find such a shape too extreme to feel comfortable with.
If I look at the Volkswagen L1 concept car instead I find it almost perfectly following the recipies of Kamm with a nice diffuser. Since they have obviously tried hard to get a one litre concept car (1l/100km) I guess they couldn´t afford to cheat with the body shape just to make it look cool. What we see is probably the naked truth and that is what I will try to copy!
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