Flight and wind tunnel studies have shown that compressibility will have serious adverse effects on characteristics of usual flap type control surface; tests made to investigate these effects.
High-speed wind-tunnel tests of NACA 0009-64 airfoil having 33.4-percent chord flap with overhang 20.1 percent of flap chord
Nat Advisory Committee Aeronautics -- Tech Note
1947
33 pages
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