Report KD 758 about the VIRYA-5T is replaced by report KD 747 about the VIRYA-5S. The title of report KD 747 is: “Calculations executed for the 2-bladed rotor of the VIRYA-5S windmill (lambda design = 7, Gö 711 airfoil, stainless steel blades) meant for connection to the axial flux generator of Hefei Top Grand type TGET450-5KW-300R for grid connection or water pumping”. The hollow blades and the shorter connecting strip make that the VIRYA-5S rotor is a lot lighter than the VIRYA-5T rotor with 4 mm thick tapered blades.