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Windmill with a Polycord transmission in between the rotor shaft and the vertical shaft to drive a rope Windmill with a Polycord transmission in between the rotor shaft and the vertical shaft to drive a rope pump KD 320

Up to now Kragten Design has developed thirteen electricity generating windmills with rotor diameters in between 1.2 and 4.6 metre. Eight of these windmills are designed especially for manufacture in developing countries. Although the main focus of Kragten Design is on the development of small electricity generating windmills, there is also a lot of know-how available about water pumping windmills because the designer, Adriaan Kragten, has worked from 1975 until 1990 as a designer of mechanically water pumping windmills in the Wind Energy Group of the University of Technology Eindhoven. In that time the main focus was on the development of windmills driving a single acting piston pump by means of a crank mechanism which was mounted to the rotor shaft. Because the windmill was equipped with a rotor with a rather high tip speed ratio of about 2, this resulted in large dynamic problems. So I have decided to spend no more time to this principle for my engineering office Kragten Design. Kragten Design was founded in 1989 and many KD-reports have been written about aspects of water pumping with windmills using other principles than piston pumps




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