Report KD 745 about the Sparta Ion front wheel hub motor has been reviewed. Chapter 6 has been modified completely. The 3-bladed VIRYA-1.25B3 rotor has been replaced by the 3-bladed VIRYA-1.38 rotor because the starting wind speed of the VIRYA-1.25B3 rotor was too high. The 3-bladed VIRYA-1.38 rotor has about the same P-n curves as the 4-bladed VIRYA-1.4 rotor as described in chapter 5 but uses less material.

A new chapter 11 has been added to report KD 727 about the VIRYA-12. The title of this chapter is: “Use of a PM-generator of Hefei Top Grand type PMG900-I-30KW-100R”. The same generator is also used in the VIRYA-14 as described in report KD 732.

Report KD 750 has been added at the menu KD-reports. The title of this report is: “Calculations executed for the rotor of the VIRYA-5R windmill (lamda design = 6.5, Gö 711 airfoil) with a 2-bladed rotor made out of Roofmate, glass fibre and epoxy”. This is an alternative rotor if good quality wood which is needed for the 2-bladed rotor of the VIRYA-5 or the 3-bladed rotor of the VIRYA-5B3 isn’t available.

Report KD 670 about the VIRYA-5.2 has been removed. It appeared that the used generator of Hefei Top Grand type TGET450-2KW-180R is too light. The about similar VIRYA-5B3 is described in report KD 710 and this wind turbine uses the stronger generator TGET450-5KW-300R.

Chapter 6.5 of report KD 579 about the VIRYA-6.5 has been reviewed completely. The title of this chapter is now: “Use of the VIRYA-6.5 with a PM-generator type PMG-I-620-10kW-250R”. This axial flux PM-generator is made by the Chinese manufacturer Hefei Top Grand.

Onder het menu KD-reports werd de volgende notitie toegevoegd: “Ideeën over realisatie van 14 bouwpercelen en één VIRYA-14 windturbine in Boskant”. De VIRYA-14 windturbine wordt beschreven in rapport KD 732.

A new chapter 9 has been added to report KD 484 about the VIRYA-3B3 rotor. The title of this chapter is: “Use of a cheaper alternative PM-generator”. This generator is described in chapter 7 of report KD 718.

A new chapter 5 has been added to report KD 745 about the Sparta Ion hub motor. The title of this new chapter is: “Designing a small rotor with a high starting torque coefficient”. The rotor is called the VIRYA-1.4. It has a diameter of 1.4 m, four steel blades and a design tip speed ratio of 2.5.

A new chapter 9 has been added to report KD 718. The title of this chapter is: “Use of a 4-pole motor frame size 160L and a 40-pole armature”. The armature has 40 mechanical poles but four magnetic poles and it can therefore be used in combination with the original 400/690 V, 3-phase winding. The armature has 360 preference positions per revolution and the peak on the cogging torque will therefore bee very low.

Report KD 748 has been added at the menu KD-reports. The title of this report is: “Ideas about a 16-pole radial flux permanent magnet generator with a 3-phase, 1-layer stator winding with no iron in the coils”.