Quote:
Originally Posted by aerohead
Technically, it's not a box cavity until it has a 'bottom.'
That open underside is polluting the pressure recovery of the top and sides, compromising performance.
If you had access to General Motors' contracted B-Roll video of their land speed record Impact/EV1 land speed record 'Yellow Ferret' box-cavity, you'd have a perfect example of what to build.
Cd 0.137, and 183-mph, in 1993!
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Well the goal before having a full proper boat tail is to do a smoother under tray and work on a permanent rear diffuser
Even though it’s not a perfect box cavity, the roof lije did extend our and go a little lower past the spoiler, and the sides created much harder separation edges. A lot of newer Toyotas use some “ extended” separation edges below their tail lights. No idea how much those effect things since they aren’t the whole rear body. And then the Kia EV 6 uses a weird mid center box cavity shape thing, almost like the Audi a2 box cavity
Either way, I wasn’t going for a box cavity for this test. I was just trying to test out the angles and attachments and extensions for the actual boat tail mod down the line. I “ felt” lower drag and better coasting though with this giant cardboard shape, so it must be doing something versus the stock rear. I got some crazy looks from the 3 total cars that drove near me though