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Pressure-distribution investigation of an N.A.C.A. 0009 airfoil with a 50-percent-chord plain flap and three tabs (1939)
NASA Technical Reports Server (NTRS) · leaf 19
N.A.C.A, Technical Note Ho. 734 Fig. 12d,e,fNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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