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”.