Comparing Airfoils

EPPLER 639 AIRFOIL

AH 80-140

EPPLER 639 AIRFOIL AH 80-140
Thickness (%) 12.529 13.949
Camber (%) 4.789 4.349
Trailing Edge Angle (%) 15.036 13.195
Lower Surface Flatness 21.443 13.298
Leading Edge Radius (%) 2.598 2.925
Maximum Lift (CL) 1.375 1.433
Maximum Lift Angle-of-Attack (deg) 14.500 14.000
Maximum Lift-to-drag (L/D) 43.114 28.169
Lift at Maximum Lift-to-drag 0.679 0.962
Angle-of-Attack for Maximum Lift-to-drag (L/D) 2.500 8.000