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Pressure distribution over a Clark Y-H airfoil section with a split flap (1937)
NASA Technical Reports Server (NTRS) · leaf 8
Figrure 3,-Pressure distribution on the Clark Y-H airfoil at ; ' J, various angles of attack. 0.15 aplit flap oq deflected 30'. « iNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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