Report KD 664 has been added to the list of public KD-reports. The title of this report is: “Calculations executed for the 2-bladed rotor of the VIRYA-1.8W windmill (lambda design = 6.25, wooden blades) used in combination with an 8-pole permanent magnet generator frame size 71 with a stator with no iron in the coils”. Report KD 664 contains detailed drawings of the rotor and the hub. This rotor is meant for the generator as described in report KD 644.