... .Patented Blades with twisted aerodynamic design made with high-strength Nylon-fiberglass materialEasy installation, no welding needed. Pole ... . 480Working Temp. rangefrom -40°C to 60°CSurvival Max. wind50m/s or 110mphOverspeed controlElectromagnetic brake & blade aerodynamic ... wind generator, windmill, wind energy, wind power home system, wind energy home system, wind solar hybrid power, grid-tie wind ...