You do realize your “Smooth as a teardrop” example is a perfect wing cross section.
But very little drag. The teardrop shape (with a particular length-to-width ratio!) produces the lowest drag.
So the question is, what are you aiming for? Maximum downforce? Minimum drag? Some compromise between the two?
BTW, the stock-type engines really do need the forward air-flow along the rear deck; that is how cooling air get to the engine!
--DD
I understand Dave, but I'm running a Subaru setup. I'd like to run a Porsche 6 cyl. but the dollar sign is way too high for my budget. It's cool if you can do it - it doesn't make dollars/sense to me but I admire those who make it work. Very cool!
And speaking of cool and aero, presently I have the radiator designed to flow out the bottom of the car but rethinking a cleaner topside exit to, again, clean up the airflow as to minimize drag. Directing the air to negate lift is the object of this exercise- if we achieve that, we don't need much downforce to keep the car planted. I'm not trying to have the tires bite so hard that they'll out corner a gazelle, just keep the car cruising smoothly with as little upset from angry air as possible. And no Veeks, I'm not gonna design a teardrop no matter what the cD says!