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Originally Posted by freebeard
at some point you have to start making mistakes in CAD (Cardboard Aided Design)
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I see you are a fan of Project Binky too.
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It would reshape the flow but not add or remove energy. But it would have skin friction.
What happens to the air flow if the floor of the diverter is deleted? What would be left would be two retractable skegs.
Two skegs and a simple curved roof is still an exponential [half-]horn, as at D below.
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I still need the 30 degree floor to clear any dip up to and including bumper scrapers (or in my case, receiver scrapers. 30 degrees is way out of laminar flow territory, so I designed the 3 sided movable diverter to restore that lower flow. Do you believe the added skin friction of the floor would be worse than the uncorrected 30 degree tail turbulence?
How does the AroCivic get by with the steeper tail flow?
(If I sound confrontational, I'm not trying to be. Text doesn't give itself easily to inflection )