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”.

Report KD 750 about the VIRYA-5R with a 2-bladed rotor made out of Roofmate is cancelled because it is doubted if the rotor can be made strong enough. The new report KD 791 is added titled: “Calculations executed for the 3-bladed rotor of the VIRYA-5B3S windmill (lambda design = 6.5, Gö 711 airfoil, stainless steel blades) meant for connection to the axial flux generator of Hefei Top Grand type TGET450-5KW-300R for grid connection or water pumping”.

At 16-3-2026, chapter 7 of KD 791 about water pumping with the VIRYA-5B3S was completely reviewed.

At 27-3-2026 a new chapter 7 is added to KD 791. The title of this chapter is: “Use of the VIRYA-5B3S for 144 V battery charging”. Water pumping is now described in chapter 8.

Report KD 377 about the pendulum safety system has been reviewed. The design wind speed Vd has been reduced from 7 m/s up to 6 m/s. Chapter 6.3 describes now an alternative with two rotors. At 26-2-2026 a new chapter 7 has been added to KD 377. The title of this chapter is: “The delta-V curve for whole numbers of V”.