Report KD 485 describes five safety systems for which the rotor is turned out of the wind. For all systems it is assumed that the rotor has a certain eccentricity e. In stead of an eccentrically placed rotor, one may also use an auxiliary vane. This use is explained in chapter 4 of KD 584 for a flat vane blade with an aspect ratio of 2 : 1. The use of a new vane type which is made out of a vertical cylinder is added to chapter 4. A vertical cylinder has almost the same characteristics as an eccentrically placed rotor and is therefore a better alternative than a flat vane blade.
The new report KD 616 has as tittle:”Translation of parts of report R 343 D of June 1978 from Dutch into English. R 343 D gives wind tunnel measurements for a rotor with tapered blades made out of a cylinder”. Report R 343 D is one of the earliest reports which I wrote when I was working at the Wind Energy Group of the University of Technology Eindhoven. It is probably the only report in which wind tunnel measurements are given for a fast running 2-bladed rotor for which the curved sheet airfoil is used with increasing chord and camber at decreasing radius. All my VIRYA windmills with blades with curved sheet airfoils have a constant chord because such blades are easier to manufacture. But tapered blades have a higher maximum Cp and look better and it might be worth the effort to design a more complicated blade press if the rotor is made in larg series.
Report KD 582 has been made public. This report describes an alternative tubular tower for the VIRYA-4.2 and the VIRYA-4.6B2. It contains strength calculations and calculations of the natural frequencies. Chapter 10 has been added to report KD 614. In this chapter the head geometry of the VIRYA-5 windmill is checked.
At the menu KD-reports, a note with the title “Sequence of KD-reports for self-study” is added just below the list in which all public KD-reports are specified. If someone wants to design a windmill and if he wants to gain the knowledge which is required to do so, it is advised to read the reports in the sequence as given in this note.