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The aerodynamic characteristics of a model wing having a split flap deflected downward and moved to the rear (1932)
NASA Technical Reports Server (NTRS) · leaf 13
rigs. 10 & 11 3.1.0.1. leebnlcal Bote Io.433NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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