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Originally Posted by MetroMPG
Also, I doubt you're going to see any reversed flow on the end of the hatchback (upper) glass. Did you get a chance to try it (tuft testing)?
The smoke trace shows boundary thickening, but I can't see how there would be separation/reversal/recirculation there.
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There is energized airflow here. The whole length of my rear window stays clear of rain at speed.
Five AirTab vortex generators were placed across the trailing edge of the rear hatch.
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After fitting the vortex generators, the measured trip fuel consumption immediately rose to 3.0 - 3.1 litres/100 km, a 3-7 per cent increase over the 2.9 litres/100km average. No change in the feel of the car could be felt - there was no apparent improvement in stability, reduction in wake noise or any other positives. Simply put, the vortex generators made things worse.
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Julian Edgar
Also a little information about Insight bellypans and rear tire airdams.
autospeed.com
