Quote:
Originally Posted by mpg_numbers_guy
Maybe I'm missing a point that's obvious to you. If the idea of a boattail/kammback on the end of a sedan won't work because the airflow goes over it and doesn't reattach, wouldn't it do the same thing with a spoiler, regardless of it having an aero shape or not?
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It really depends on the spoiler. I see aerodynamics as a black art.
A spoiler won't reattach flow, but it can reduce turbulent wake if it's very carefully placed. It's not nearly as effective as a kamm or boat tail, which can keep laminar flow, but it does affect wake.
Here's an article you might enjoy:
https://tylerlinner1.kinja.com/a-pra...=1437153595522
A good example is a pickup truck bed. It's usually the case that drag is lower with the tailgate up, rather than down.
