Sounds like a fun project. But what are you optimising for? Downforce or low drag or a mix? I would experiment with a full boat tail and a half boat tail, with a vertical cutoff, oval shape. Low angle difuser underneath.
A boat tail is like a low drag baseline. I assume you've seen the aero civic?
Im sure you've heard of reynolds numbers right? Your paper wont mean much unless you test with similar reynolds numbers to real conditions. Good luck!
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