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Wind-tunnel Investigation of the NACA 654-421 Airfoil Section with a Double Slotted Flap and Boundary Layer Control by Suction (1947)
NASA Technical Reports Server (NTRS) · leaf 19
NACA TN Nc. 1395 Fig. 2b Flgiire 2.- Concluded.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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