The small experiences my excompany had attempting to make the nasa flush duct for aerospatial tells me it's really fussy in the original configuration. We met the drawing tolerances, modded it even more to meet the original nasa specs and were told it never went low drag. Come to find out NASA had the same issues. Does work well for a flush duct, but not what Nasa promised.
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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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