$30 DIY Kilowatt Wind Turbine - Build Tutorial

The turbine can be made almost entirely from recycled materials with basic tools in six hours for $20-35. It is tested at 35-40% mechanically efficient, generates 130 watts mechanical in a 30 km/h wind, 1 kilowatt at 60 km/h, and can survive 100 km/h gusts.

The full step by step build tutorial can be found here:
https://opensourcelowtech.org/wind_turbine.html