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Wind-tunnel investigation of an N.A.C.A. 23021 airfoil with two arrangements of a 40-percent-chord slotted flap (1939)
NASA Technical Reports Server (NTRS) · leaf 13
N.A.C.A. Technical Note No. 726 Fig. 3 … Figure 2.- Section aerodynamic characteristics of N.A.C.A. 23021 plain airfoil.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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