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Hi Kach,
I don't know why the smoke in the windtunnel picture is leaving the car at the rear window. I think it's because the smoke is a little heavier then air and that's why it is "thrown" out of trajectory. It could also be that the smoke is getting to thin to see at that point.
My results are consistent with the results of autospeed, so I think it is valid.
I don't think 10 mph would make such a big difference. To tell the truth I was driving a little faster then 100 km/h in the "without spoiler" pictures/video. But it was something like 110 km/h. So, like 9 mph more.
I wonder at what speed the Volkswagen windtunnel picture is taken..
I read a chapter of a book explaining the basic principles of aerodynamics. It's also online available. I recommend that book very highly. As soon as I can post links, I will post a link.
It also covers the angle of the rear of a vehicle, and that it should be cut off like a Kamm rear, or have a certain angle (like the Prius probably).
The beetle rear is somewhere in between.. which is not good.
Greetings,
Gerrelt.
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