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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 23
.A..G.A. Teohnical ttote No. 715 Fig. 13 … Flap chord, percent cw Figure 13.~ Variation of increment of Bection maximum lift coefficient with flap chord. Slotted flaps on U.A..C.A. 23012 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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