Report KD 732 about the VIRYA-14 is replaced by report KD 783 about the VIRYA-13. The title of KD 783 is: “Calculations executed for the 3-bladed rotor of the VIRYA-13 windmill (lambda design = 6) with the hinged side vane saftey system connected to the generator type PMG900-I-30KW-100R for grid connection”. The hinged side vane safety system of the VIRYA-13 seems simpler to build as the pendulum safety system of the VIRYA-14.