The Ugrinsky rotor was developed by the Russian engineer K.A.Ugrinsky in 1946. https://vawt.ro/2016/09/08/ugrinsky/ (Romanian). It may be used in a Vertical Axis Wind Turbine, VAWT. The rotor looks like a variation of the Savonius rotor, and it is said to be a little more efficient. The rotor vanes, or buckets may be straight, or "twisted" in a spiral. The rotor may also be 3D printed.

https://www.youtube.com/watch?v=tCETDwUQrqk&t=27s
https://www.youtube.com/watch?v=0rPtwoAb5oY

Cross section dimensions:
https://www.kleinwindanlagen.de/Forum/cf3/topic.php?t=6125

The patent version seems to have retractable portions.
https://patents.google.com/patent/RU2246634C2/en

There are STL files for several versions on thingiverse.

https://mdpi-res.com/d_attachment/energies/energies-15-02478/article_deploy/energies-15-02478.pdf?version=1648462064

This model: ( https://www.thingiverse.com/thing:2238394 )
Blade thickness 1.5 mm
Radius at blade center 60.0 mm
Outer diameter 121.5 mm
cBucket center distance 36.0 mm
cBucket radius r = 0.4*60 = 24.0 mm
RBucket center distance b = 0.8*60 = 48.0 mm
RBucket radius 60.0 mm
For helical version:
One 60 degree section height = 70.0 mm
Six stacked sections = 360 degres.
Curve centerline cross section is scalable.
This file shows only the cross section, not a complete model.

- Brian