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The Effects of Surface Waviness and of Rib Stitching on Wing Drag (1939)
NASA Technical Reports Server (NTRS) · leaf 14
Fig.5 N.A.C.A. Technical Note No. 724 Figure 5.- Drag due to wavineaa on rear 92 percent of "both surfaces of airfoil. Chord, 5 feet.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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