14 















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/ 















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• 



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/ + 



+ 















• / 

















+ 1 

















1 



L 













< 



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D' 



/a 











D 



..^-^^ 



^fcx ^ 





















"• Suction Side iBraslow and Viscon1i,Ref. (26), i 









Low-Turbulence 



+ Pressure SideJ NACA Airfoil 65,215,-114 









Wind Tunnel 



X Von Doenhoff,Ref.(25),NACA Airfoil 0012 



O '^rhcihniipr nnH ^krnm-ilnrt Rpf fl ■^^ Pint PIntP 









rn Jones, Ref.(20), Wing Section ISpercent Thick 









Flight -< A Zalovcik and Skoog, (24), Low-Drag 









L Wing Section 14.7 percent Thick 

 1 1 1 1 



, Average Pressure Gradient from Neutral Stability Point to Transition Point 



V dT 



Figure 4 - Position of Self-Excited Transition as Function of Average Pressure Gradient 



