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' 17-degrees '
I just lost all everything I typed for the last 30-minutes, and I'm not going to try it again.
You have a chance at 17-degrees with the VGs. There was a global competition, invited by the US Air Force, to 'fix' the Lockheed C-130 Hercules'( 'highly upswept after-body, high adverse ( pressure ) gradient / fuel consumption.' ) tail section drag by using the same VG approach.
Re: Tobj'o'rn Gustavsson, KTH, Department of Aeronautical and Vehicle Engineering, Royal Institute of Technology, Stockholm, Sweden, 2006.
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