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Effect of the Surface Condition of a Wing on the Aerodynamic Characteristics of an Airplane (1934)
NASA Technical Reports Server (NTRS) · leaf 8
N.A.C.A. Technical Note No.495 Pigs. 2,3,4 Figure 4.-Pairchild P-22 airplane mounted in full-scale tunnel.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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