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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 15
I.A.O.i. TeohnloaJ. Iota Ho. 728 … 10 8 6 4 8 0 Parceat wing ohord o) 6f - 80° Figux* 4.- Contours ot fl»p looation. for Oi,^. The 0.40o •lotted flap l-».NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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