Report KD 727 has been added to the menu KD-reports. The title of this report is: “Calculations executed for the 4-bladed rotor of the VIRYA-12 windmill (lambda design = 5) with the pendulum safety system with a torsion spring connected to a PM-generator made from an asynchronous motor frame size 355.

This rotor has a very low noise level because it has wooden blades and a rather low design tip speed ratio of 5. The visual acceptance might be large because it has four blades, just as a traditional Dutch windmill.

A new chapter 8 “Description of the PM-generator” has been added to KD 727 at 19-10-2021.