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If your application benefits from turbulent flow (say the turbulence diminishes downwind vortices) then it will reduce drag. If the aft boundary layer is mostly attached, then the turbulence will increase drag. It works on golfballs because there's this huge drag vortex behind the golfball that gets dramatically reduced. Aerohead has pointed out that there is an approach angle and a bunch of other criteria involved
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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