EPPLER 639 AIRFOIL

Thickness: 12.5%
Camber: 4.8%
Trailing edge angle: 15.0o
Lower flatness: 21.4%
Leading edge radius: 2.6%
Efficiency: 35.1
Max CL: 1.375
Max CL angle: 14.5
Max L/D: 43.114
Max L/D angle: 2.5
Max L/D CL: 0.679
Stall angle: 14.5
Zero-lift angle: -3.0