6 watt turbine design from Adriaan Kragten

Kragten Design VIRYA-1.04


Diameter                                                                           D = 1.04 m

Number of blades                                                             B = 3

Design tip speed ratio                                                      ld = 3.5

Mass                                                                                 including 1 m tower pipe  m = 4.85 kg

Starting wind speed                                                          Vstart = 2.6 m/s

Survival wind speed                                                         Vsurv = 30 m/s

Cut in wind speed (if started)                                          Vcut in = 2 m/s

Rated wind speed                                                             Vrated = 8 m/s

Nominal voltage                                                                12 V DC

Power at rated wind speed                                               P = 6 W

In this manual the 3-bladed VIRYA-1.04, electricity generating windmill, is described. The generator of this windmill is made of a Shimano Nexus hub dynamo type DH-2R40 or another type with similar flange dimensions. It is expected that, together with the detailed drawings, the windmill can be manufactured in a simple workshop.

For more details see the web page of

Adriaan Kragten, B. Sc.

Kragten Design

Populierenlaan 51, 5492 SG Sint-Oedenrode, The Netherlands

Telephone: + 31 413 475770


and download the pdf file manual_virya-1.04_may_2013.pdf

thanks Adriaan!


About hugh

I live off-grid in NW Scotland and have spent my life playing with wind turbines. I also love small hydros. Hands on renewable energy is my thing and I like to learn and to share my experiences.
This entry was posted in Adriaan Kragten, Books, construction, People. Bookmark the permalink.

One Response to 6 watt turbine design from Adriaan Kragten

  1. admin says:

    adriaan writes:
    Dear friends

    Since yesterday I have my own website: http://www.kdwindturbines.nl . I have designed this website myself using the nice book ”Een website maken voor uw eigen bedrijf” (May 2014, in Dutch). The website gives information in English about my VIRYA-windmills and public KD-reports. From 1 February 2015, this information is no longer available on my page on the website of Bidnetwork because Bidnetwork is cancelled at that time and replaced by Bidx.

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