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I concur with Coanda-like. A true Coanda nozzle would be pointed rearward, not upward.The convergent duct is tetrahedronal in shape, shrinking from a vertical slot to horizontal.
But exhausting directly behind the Gurney flap is (iffen it works) pure genius. And I don't see a problem with the ducting. VW Squarebacks have an air intake that goes in, down, back, in to the center, and finally forward through a rubber bellow to the intake fan. The fenders are plenums and the rear apron is a duct. It all sees to work.
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