Falcon™ Mach 3 Blade & Hub Features:    Smooth, fast, and well balanced. Advanced design for GM Delco alternators.  All parts are laser cut to exact tolerances for high quality operation and appearance.  All high tensile strength aluminum and 1018 steel construction will withstand severe weather conditions!  Tested to 95 MPH winds.  Extremely large pitches on aluminum blades act like an anchor, and don’t allow the blades to cut through the wind. Ours are low pitched for best performance.  The gull wing design has eliminated noise and cascade failure that all other aluminum blades suffer from.  The more wind, the higher the RPM keeps increasing non-stop.  These extra large blades are designed for high torque.    Blades:    .125″ thick aircraft aluminum with manganese for added strength  Each blade measures 29.5 inches (59.69 cm) long  Each blade is 6.5 inches (16.51 cm) wide  Assembled diameter: 62 inches  Made in the USA