Wikipedia says: > Savonius turbines are used whenever cost or reliability is much more important than efficiency. The German article is a bit more detailed an

Wikipedia says: > Savonius turbines are used whenever cost or reliability is much more important than efficiency. The German article is a bit more detailed and claims that Savonius tubines are effective at speeds as low as 2m/s and produce high torque even then. Maybe the high pressure on Venus increases this effect?