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Full Scale Drag Tests on Various Parts of Sperry Messenger Airplane (1928)
NASA Technical Reports Server (NTRS) · leaf 12
N.A.O.A. Technical Note No.271 Fig. 7 … Fig.7 Drag due to various parts of Sperry Messenger airplane without wings at an airspeed of 80 M.P.H.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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