Create a windmill using 3 water bottle. This windmill base has 3 screw in sockets to put common water bottle in. Screw in the bottle, see which direction it ends up in and cut the bottle to create a wing.
Designed for a 4mm steel rod.

The windmill seems to pick up a small breeze but for now it quickly stops, due to too much friction.

https://www.youtube.com/watch?v=giOfWCM8xGs&feature=youtu.be

• Get 3 plastic bottles
• Screw them on first to see in which position they will end
• Cut half of the bottle to create a wing
• Screw them back on