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The smoke gives you an image of a "virtual" boattail.
Some people are using vortex generators to pull the wind down over steeply inclined rear windows in order to have a more effective rear wing.
I've been thinking of an experiment that I'd like to try combining vortex generators before a kammback that would be steeper than ideal in order to shorten the "virtual" boattail effect, and hopefully make a shorter kammback more effective and eliminate the need for a full boattail.
I don't have spreadsheets full of mathematical equations to back up my seat of the pants theory, but cardboard is free and I'm unemployed, so I've got some time...
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