M-B CLA roofline flow separation
At about 26-seconds into the video, the CLA will rotate to reveal that the single smoke filament flowing 'over' the car 'IN' the boundary-layer, has 'separated' over the steep backlight, and never reattaches. Something which can be compared to smoke-flow video offered with the Mercedes-Benz IAA concept.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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