Chapter 3 of KD 679 has been reviewed. The older version describes the calculation of the flux density in the air gap for a synthetic stator sheet. The reviewed version describes the calculation of the flux density for a steel stator sheet.

A new chapter 7 has been added to report KD 678 about the VIRYA-1.02 and the measurements of the generator. Chapter 7 gives a discussion of the measuring results and it is explained at what places energy is lost if the generator runs at 575 rpm and supplies an electrical power of 27 W.

A new chapter 3 has been added to report KD 416 about drag machines. Chapter 3 gives the Cp-lambda curve for only the cup which is moving in the direction of the wind.