Quote:
Originally Posted by Angel And The Wolf
I used the template, both vertically and horizontally to draw an aerodynamic boat tail.
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I'm going to stop you right there: if you put tufts on the rear window and go for a drive, you'll see that there is attached airflow already over the back of the Prius. There's no need to build it up to meet a theoretical template; rather, you should change the angle of the spoiler, which currently sticks out nearly parallel to the ground (to combat rear lift). The tail extension you'll have to test to see if it can continue the same angle as the window (somewhere around 17 degrees from horizontal) or if it needs to relax that to avoid flow separation, like the EV1 LSR tail cone. The cargo carrier I'm building right now relaxes that angle, because I didn't want to mess with the spoiler for now and I want to ensure flow attachment of the air coming off of it. In a future iteration I might try something more aggressive.