SAVONIUS ROTOR PUMPING WATER
Power from Wind
May 13, 1931
The new S-shaped rotor invented by S. J. Savonius of Helsingfors, Finland.
This is the most efficient means known of getting power from moving air and has been used as a ventilator.
A similar rotor can also be used as a tidal motor in which case it always turns in the same direction regardless of whether the tide is ebbing or flooding. Savonius rotor pumping water.