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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 14

An illustration from Wind-tunnel Investigation of the NACA 654-421 Airfoil Section with a Double Slotted Flap and Boundary Layer Control by Suction, 1947, leaf 14

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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