Report KD 651 has been added to the menu KD-reports. The title of this report is: “Calculations executed for the 4-bladed rotor of the VIRYA-3.6L2 windmill (lambda design = 2, galvanised steel blades) with a Polycord transmission in between the rotor shaft and the vertical shaft to drive a rotating positive displacement pump”. The VIRYA-3.6L2 makes use of the same Polycord transmission as used for the VIRYA-3.6 with lambda design = 3.5 and which is meant to drive a centrifugal pump. Report KD 490 in which many options for water pumping are described, has also been reviewed.