Report KD 670 has been added to the list of public KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the grid connected VIRYA-5.2 windmill (lambda design = 6, Gö 711 airfoil, wooden blades) provided with the hinged side vane safety system”. An advantage of this windmill is that it uses a standard Chinese axial flux generator and so it isn’t necessary to build the generator.