Report KD 634 has been added to the list of free public KD-reports. The title of this report is: Calculations executed for the 3-bladed rotor of the VIRYA-3.4 windmill (lambda design = 4.5, galvanised steel blades) driving a centrifugal pump through a Polycord transmission with i = 2.5 and a vertical shaft in the tower centre. Report KD 623 has been added to the references of report KD 490: Water pumping with a windmill.