Low-speed investigation of the stalling of a thin, faired, double-wedge airfoil with nose flap

Leonard M. Rose, John M. Altman
naca-tn-2172
Aug 1950

The stalling characteristics of a 4.23-percent-thick faired, double-wedge airfoil section with and without a plain nose flap were investigated. Flap chords equal to 12, 16, 20, and 25 percent of the airfoil chord were tested.

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http://naca.central.cranfield.ac.uk/reports/1950/naca-tn-2172.pdf