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Originally Posted by Sven7
Got a source on that? Interesting.
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Sorry, just my memory of the NASA-Ames "Astrogram" newsletter. They had an article on wind-tunnel testing of trailer designs either in the 40x80 wind tunnel, or at the big Computational Fluid Dynamics center. The illustration that went along with the article showed two "flaps" off the end of the trailer compared to a boat-tail design. The two flaps were about 80% as effective.
-soD