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Wind-tunnel investigation of NACA 23012 airfoil with various arrangements of slotted flaps (1939)
NASA Technical Reports Server (NTRS) · leaf 9
(e) ci-2.0; S,-20°. (f) ci=2.6H/-30«. Fiqxjbb 10.—Contours of flapjocatlon for «r Slotted flap I-b,NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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