Quote:
Originally Posted by JulianEdgar
My aero mods on the Insight are all to improve driving performance, not to reduce drag. So my undertray and diffuser are to give downforce, my rear spoiler is to give downforce - and my rear fins are to provide better straight-line stability.
That said, I have also tried to do aero modifications that are likely to reduce drag - and in the case of the rear spoiler / fins, they measurably do so (at least in light winds).
I haven't tested the rear fins / spoiler for drag in strong winds, so I can't answer the question about drag in these conditions.
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I must have missed the above mentioned mods being analysed originally for handling/DF improvements, and not for drag reduction. I'll have to go back and review.
I would also like to research the detailed explanation for the use of slanted fins for mainly drag reduction for effectively a ground based vehicle.