Low on actual info, but I guess the wings create some sort of negative pressure that drives the small turbine at the bottom.
I’m no big city doctor, but I can see something moving in the motionless unit.
Wondering if they’re using venturi effect to take laterally moving wind and converting it into a pressure difference between the bottom and the top and run a turbine with that pressure difference.
I’m interested in how these hold up in -40C or blizzard conditions, since solar panels are a non-starter up here but wind isn’t necessarily.
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