Report KD 797 about the VIRYA-4.1S is replaced by report KD 801 about the VIRYA-4.5. The title of KD 801 is: “Calculations executed for the 3-bladed rotor of the VIRYA-4.5 windmill (lambda design = 5, galvanised steel blades) driving the PM-generator of Magnetic Innovations type 260-75-LS for water pumping or grid connection or the type 260-75-HS for 48 V battery charging”.