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Part of the reason I want the fin is the visual link to vintage endurance cars and aircraft (hence also the sliding canopy), part to run a vertical taillight up it as the asymmetry should get more attention (if that will be a problem), and part expense as otherwise, I think it would look dumb as a teardrop with the back half metal and doing the whole thing clear plastic is more money and will need to be replaced due to UV at some point (I can make the simpler form in the center that slides myself). I don't think stability will be much of an issue at all with a Miata with about two-thirds the stock frontal area and a CD easily somewhere in the .20s, but this discussion raised some questions I wanted to look into. I don't mind a little compromise for aesthetics, but not if it's a drastically negative effect on the functionally.
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