Airfoil blade

An airfoil blade having along substantially the entire length thereof, a cross-sectional airfoil shape comprising a rounded, generally parabolic leading edge portion fairing into a pressure surface;

• said pressure surface having a leading convex portion fairing into a trailing portion;
• said leading edge portion also fairing into a convex suction surface;
• said pressure and suction surfaces merging into a blunt trailing edge;
• one of said airfoil shapes having a thickness ratio of 0.04, a maximum thickness at approximately 0.35 x/c and a maximum camber at approximately 0.5 x/c;
• another of said airfoil shapes having a thickness ratio of 0.06, a maximum thickness at approximately 0.34 x/c and a maximum camber at approximately 0.50 x/c;
• another of said airfoil shapes having a thickness ratio of 0.08, a maximum thickness at approximately 0.33 x/c and a maximum camber at approximately 0.50 x/c;
• another of said airfoil shapes having a thickness ratio of 0.12, a maximum thickness at approximately 0.32 x/c and a maximum camber at approximately 0.38 x/c;
• another of said airfoil shapes having a thickness ratio of 0.20, a maximum thickness at approximately 0.315 x/c and a maximum camber at approximately 0.30 x/c and another of said airfoil shapes having a thickness ratio of 0.30, a maximum thickness at approximately 0.310 x/c and a maximum camber at approximately 0.29 x/c wherein x/c is the dimensionless chord length of said airfoil shapes;
• all of said airfoil shapes having a trailing edge portion of a thickness equal to approximately 10% of the maximum shape thickness.