Report KD 772 about the VIRYA-10S with a 3-bladed rotor with stainless steel blades is replaced by report KD 787 about the VIRYA-10B2 with a 2-bladed rotor with wooden blades. The title of KD 787 is: “Calculations for the 2-bladed rotor of the VIRYA-10B2 windmill (lambda design = 7, Gö 711 airfoil, wooden blades) using the hinged side vane safety system and a generator type TGET770-H-10KW-100R for grid connection”. It is expected that manufacture of hollow stainless steel blades is too difficult for most companies and that manufacture of two wooden blades is easier.