The VIRYA-4.6 with a 3-bladed rotor and a disign tip speed ratio of 7 is replaced by the VIRYA-4.6B2 with a 2-bladed rotor and a design tip speed ratio of 7.75. For the former VIRYA-4.6, a generator with a special 267/460 V winding in star was required for 48 V battery charging. The VIRYA-4.6B2 has a higher rotatinal speed and therefore the standard 400/690 V winding in star can be used for 96 V battery charging. For 48 V battery charging, the standard winding can be modified into a 200/345 V winding by connecting the first and the second layer in parallel in stead of in series. This procedure is described in report KD 341.
This older KD-report describes the Gö 711-12% and the Gö 711-10% airfoils.