The Swedish 3MW wind turbine, at Maglarp, from the early wind energy research program, has been scrutinized with the intent to tap valuable aerodynamic information from recorded campaigns as well as continuous measurements. Similarly the National Renewable Energy Laboratory (NREL) data from wind tunnel tests in the world´s biggest wind tunnel at Ames, California have been studied. Part of the study was to find out if data were at all available for the purpose of predicting performance and/or loads from dynamic events. Conclusions were that data from both databases are available. The Maglarp data contain no information about aerodynamic coefficicients in stall. But,for continuous operation the unstalled data used functioned reasonably well to propose continued use of the two-dimensional aerodynamic coefficients that were used in 1980 to predict the performance of the turbine. These data, valid for the NACA 23xxx series of airfoils, were taken from the well known Abbots&Doenhoff "Theory of Wing Sections" book. For modern requirements of performance prediction the Maglarp data are questionable. The NREL data includes data from the full operational envelope including linear and separated blade flows. It is very useful for dynamic events in both of these kinds of flows.