... :1. Optimum aerodynamic shape design: high efficiency, low noise.2. Centrifugal pitch controlled mechanism: 2m/s low wind speed startup ... 5. Sealed slip ring, no cable twist;6. Streamline design.7. Long acting anticorrosive treats, no corrosion in 15years. Pitch ... start mechanical brake to stop wind turbine.Rotor Diameter (m)7.2Material and number of the bladeFiber-glass Reinforced * 3Rated power ...