Homemade ion engine

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One thing that you can try with your tesla coil is putting a z-shaped piece of tinfoil like the one in the video on top and mount it in such a way that it can spin freely. When you turn your TC on the tinfoil will start spinning rapidly. I am not sure what physical principle is at work there. Some people call it an ion engine. One weird thing is that it is actually spinning in the opposite direction than the sharp ends of the tin foil are pointing.
You can read more about this here:
https://easterneuropeanbarbarian.wordpress.com/2015/11/01/homemade-ion-engine/
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