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Wind-tunnel investigation of an N.A.C.A. 23012 airfoil with two arrangements of a wide-chord slotted flap (1939)
NASA Technical Reports Server (NTRS) · leaf 19
N.A.C.A. Technical Note No. 715 Fig. a … Section lift coefficient, ci Figure 3.- Section aerodynamic characteristics of N.A.CA. £3012 airfoil with 0.40cu slotted flop l-o.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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