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Calculations executed for the rotor of the VIRYA-3.1 wind Calculations executed for the rotor of the VIRYA-3.1 windmill KD 511

Already in 1977 I have designed and built a very light 2-bladed windmill rotor with a diameter D = 3.2 m and a design tip speed ratio λd = 8 which was manufactured from the isolation material Roofmate covered with glass fibre and epoxy. A photo of this rotor is given in appendix 1. This rotor was damaged in a strong storm because the windmill for which it was used, was not provided with a safety system which limits the thrust and because the rotor was not strong enough. However, the manufacturing procedure was rather simple and a large rotor can be manufactured with the used procedure at a rather low price. So it is investigated how a rather large rotor looks like if it is manufactured from Roofmate material.




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