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Air curtains are a relatively new thing, used by many manufacturers now. Not mentioned in version two of the seemingly all knowing Hucho book, not mentioned from what I remember of version four either.
The point is though that modern cars all use compromises, like air curtains over wheel covers or spoilers over tapering to a point. If you want to modify your car, you need to make similar compromises, you probably can't remake your car to look like some "optimal" shape, you work with what you have.
Why are new innovations and new ways of reducing drag not celebrated?
Seemingly every post goes like this: "I added a diffuser and undertray and got a 10% drag reduction" and aerohead replies "too much pressure drag, to solve this just remake the entire car into a different shape from the 1920s". And then the post never gets back on topic
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