Pigs.13,14 N.A.C.A. Technical Memorandum No. 890 Figure 13.- Normal force coefficient as a function of angle of attack, cn ■■ coefficient of entire wing section, cni= coefficient of main wing section, cn2=coefficient of flap section. … Figure 14.- Tangential force coefficient as function of angle of attack, ct^coefficient of entire wing section, c^ =coefficient of main wing section, c^ - coefficient of flap section.
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