Report KD 805 can be copied for free from my website at the menu KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-3.5B3 windmill (lambda design = 6, wooden blades, Gö 711 airfoil) with the hinged side vane safety system using the generator of Hefei Top Grand model TGET320-1KW-350R for 24 V battery charging”. KD 805 replaces KD 705 about the VIRYA-3B3 using the same generator.

Report KD 797 about the VIRYA-4.1S is replaced by report KD 801 about the VIRYA-4.5. The title of KD 801 is: “Calculations executed for the 3-bladed rotor of the VIRYA-4.5 windmill (lambda design = 5, galvanised steel blades) driving the PM-generator of Magnetic Innovations type 260-75-LS for water pumping or grid connection or the type 260-75-HS for 48 V battery charging”.

Report KD 802 can be copied for free from my website at the menu KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-1.99 windmill (lambda design = 4.5, stainless steel blades) with the hinged side vane safety system using the generator of Hefei Top Grand type TGET260-0.5KW-350R for 24 V battery charging”. The advantage of this wind turbine is that no building permit is required in The Netherlands because the rotor diameter is smaller than 2 m.

Report KD 797 can be copied for free from my website at the menu KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-4.1S windmill (lambda design = 4.5, stainless steel blades) driving the PM-generator of Magnetic Innovations type 260-75 LS for water pumping or grid connection or the type 260-75 HS for 48 V battery charging”.

Chapter 7 of report KD 749 about water pumping with the VIRYA-5S has been completely reviewed. Figure 7 has been added.

Report KD 796 can be copied for free from my website at the menu KD-reports. The title of this report is: “Ideas about a 20-pole radial flux permanent magnet generator with a 3-phase, 1-layer winding with no iron in the coils”. Report KD 645 about a 10-pole generator is cancelled.

Report KD 437 about the VIRYA-15 has been reviewed. The curve e = 0.75 L has been added in figure 8.

Report KD 793 about the VIRYA-3.2 is replaced by report KD 794 about the VIRYA-3.6. The title of KD 794 is: “Calculations executed for the 3-bladed rotor of the VIRYA-3.6 windmill (lambda design = 4.75, stainless steel blades) driving the PM-generator of Magnetic Innovations type 260-25 HS for 48 V battery charging” or water pumping. The reason is that it was expected that the torque level of the chosen generator allows a larger windmill rotor resulting in a maximum electrical power of about 1 kW at V = 10 m/s.

Report KD 792 about the VIRYA-4S is replaced by report KD 793 about the VIRYA-3.2. The title of KD 793 is: “Calculations executed for the 3-bladed rotor of the VIRYA-3.2 windmill (lambda design = 4.5, stainless steel blades) driving the PM-generator of Magnetic Innovations type 260-25 HS for 48 V battery charging”. The reason is that I could borrow a generator with the frame size which is used for the VIRYA-3.2 and that I have performed some measurements at this generator. The measurements are given in chapter 9 of KD 793.

At 11-3-2026, report KD 793 was completely reviewed. The rated wind speed was increased from 9 m/s up to 10 m/s. The Q-n curves for short-circuit and for 52 V star are now derived from the measurents for short-circuit as given in chapter 9.

At 12-3-2026, chapter 8 of KD 793 was extended. Apart from a winding with six coil bundles of five coils now also the option of three coil bundles of ten coils is described. This appears to be the configuration of the real winding which is shown in the photo of figure 7.

At 13-3-2026, the estimated peak torque of the generator was reduced from 95 Nm up to 75 Nm.

Report KD 792 can be copied for free from my website at the menu KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-4S windmill (lambda design = 5, stainless steel blades) driving the PM-generator of Magnetic Innovations type 260-75 HS for 48 V battery charging”. The compact radial flux generator of this wind turbine is originally used as a fan motor. At 25-2-2026, a new chapter 7 has been added to KD 792. The title of this chapter is: “Simplification of the spoke assembly”. The triangular sheet is now cancelled. At 27-2-2026 a new chapter 8 has been added to KD 792. The title of this chapter is: “Description of the generator winding”.