Stackable Ugrinsky Vertical Wind Turbine VAWT

thingiverse

This VAWT uses a design developed by K.A.Ugrinsky in 1946. It is essentially a Miller rotor with integrated Lenz 2 features. The diameter of the disc is 205 mm. The active rotor diameter is 200 mm. The rotor shape is taken from Ugrinsky's sketch, using dimension R=100. You can either print the bottom part once and use the cover or alternatively print the bottom several times and stack them (twisted by 90 degrees), using the cover only on the uppermost part. I am using two bottoms and the thing spins nicely in my garden at pretty low winds. If you print both, this one and also the C-Rotor in my other design, you can directly benchmark the two designs. I glued all parts together with semi-liquid cyan acrylate glue. It is designed for use with 608 ball bearings (8mm rod, 22 mm outer diameter, 7 mm high). I am only using two bearings and do not install one in the middle to prevent mechanical stress. The bearing covers protect the bearings a bit from rain. I have been running both the C-Rotor and the Ugrinsky in my garden for some time now. I did not make measurements and I did not test them under a load. However, comparing them as free-running rotors over a longer time in many different wind situations, the Ugrinsky provides significantly better performance. It starts spinning at lower wind speeds and produces higher RPM.