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0.8c Figure 1.08 L1ft coeffic1ents 319 Reference 365 AERODYNAMIC CHARACTERISTICS A1r Corps absolute coefficient airfoils at speeds Angle of attack arc sections ax1s Bureau of Aeronautics Ch1ef CHARACTERISTICS OF CIRCULAR-ARC characteristics very little Charles F Charles G chord length circular-arc section Cl above table Cl Vic Cl Vlc 20 Clark Y families Clark Y section COMMITTEE FOR AERONAUTICS cont1n corresponding R. A. F. D. C. Charles efficient at high efficient than airfoils eight circular-arc airfoils extremely inefficient Fechet high lift coefficients HIGH SPEEDS high tip speeds J. H. Towers leading and trailing lift and drag Marv1n moderate rounding N. A. C. A. Technical Report NATIONAL ADVISORY COMMITTEE number Orv1lle Wr1ght R. A. F. and Clark R. A. F. or Clark S. W. Stratton speed of 0.5 speed of 1.08c speed of sound stream 2 inches table cont1nued TABLE I—Continued AIRFOIL thickness ratio trailing edges Un1ted States Army W1ll1am Wash1ngton