Report KD 676 has been added at the menu KD-reports. The tittle of this report is: “Calculations executed for the 2-bladed rotor of the VIRYA-2.22 windmill (lambda design = 5, stainless steel blades) using the axial flux PM-generator of Hefei Top Grand model TGET260-0.5KW-350R”. The VIRYA-2.22 has also been added to the folder of the VIRYA-1.75 W and the VIRYA-1.8W.

Report KD 608 has been reviewed. The thickness of the aluminium rotor blades has been increased from 1.5 up to 2 mm. A new chapter 9 has been added in which the use of a steel stator sheet has been investigated. Some minor changes have been made in the report.

Report KD 672 has been added at the menu KD-reports. The tittle of this report is: “Use of the VIRYA-1 or the VIRYA-1.25AF for pumping of drinking water using a 12 V battery and a pump with a 12 V, DC motor”. Although the VIRYA-1 is a small windmill with a rotor diameter of only 1 m, it is big enough to pump a flow q of 200 litres water per day against a height H = 17 m at a wind speed less than 3 m/s.

Report KD 490 “Water pumping with a windmill” has been reviewed such that report KD 672 is now also mentioned.

Onder het menu “No wind energy” werd de Nederlandstalige notitie “De rechte schuiftrompet in C” toegevoegd. Deze notitie beschrijft een zeer eenvoudig nieuw blaasinstrument zonder ventielen en zonder bochten in de hoofdbuis.

Report KD 671 has been added to the menu KD-reports. The title of this report is: “Translation of parts of report R-668-A “Optimalisering van een windservo” (Optimizing of a wind servo) from Dutch into English. Ideas about the VIRYA-2B8″.

Report R-668-A of the Wind Energy Group of the University of Technology Eindhoven was already written in 1984 by the student J. Swinkels. I was one of his supervisors. As this report is no longer available, I thought that it is useful to translate the most important part of it and make it public again.

Report KD 671 gives the wind tunnel measurements for a wind servo for the most promising blade angle of 30° for seven different yaw angles. Chapter 4 gives correction for wind tunnel blockage for the rotor perpendicular to the wind. Chapter 5 describes the VIRYA-2B8 rotor which is about congruent to the measured wind tunnel model.

Report KD 670, in which the VIRYA-5.2 rotor is described, has been reviewed. Detailed drawings of the rotor have been added in appendix 3.

Report KD 670 has been added to the list of public KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the grid connected VIRYA-5.2 windmill (lambda design = 6, Gö 711 airfoil, wooden blades) provided with the hinged side vane safety system”. An advantage of this windmill is that it uses a standard Chinese axial flux generator and so it isn’t necessary to build the generator.

Report KD 668 is reviewed. This report describes a 24-pole radial flux PM-generator for the VIRYA-4.2 with no iron in the coils. Figure 1 and 2 have been changed such that the two disks are now lying within the sides of the armature. A new chapter 8 has been added in which an alternative stator is described which has 18 separate coils.

My website has been made safer by changing to https://www.kdwindturbines.nl. This has been done by the plugin Really Simple SSL.

A folder about the recently designed VIRYA-1.75W and the VIRYA-1.8W windmills is added at the menu VIRYA-folders.