1.5 kilometers Dr. Chris Hanning (UK) - Cape Cod Commission

Pitch versus Stall ControlVestas V-82 vs Nordex N-100• If Nordex had eliminated aerodynamic amplitude modulation noisewith newer controls and blade designs then we would have heardabout it all over the news.• “Whether pitch or stall control, it has not been shown that windturbine blades can maintain correct, optimal angle to the incomingwind with high wind shear and veer shear.” (Robert Rand Letter to Chris Seniedated June 13, 2011)Comparison of Nordex N-100 and Vestas V82 quoted sound power levels.10m wind speed, m/s 80m wind speed, m/s V82 Lw, dBA N‐100 Lw, dBA Difference, dBA3 4.1 101.1 96.8 ‐4.34 5.5 101.4 96.8 ‐2.65 6.8 101.6 101.1 ‐0.56 8.2 101.9 104.4 2.57 9.6 102.5 105.8 3.38 10.9 103.8 106 2.29 12.3 106.1 106 ‐0.110 13.7 108.4 106 ‐2.411 15 109.5 106 ‐3.512 16.4 109.5 106 ‐3.5