Two Stage Air Turbine Motor/Generator

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I made this build two years ago https://www.youtube.com/watch?v=yRFZqqDdUqU and i decided to bring it back to life, since it was sitting in a box all this time. Fortunately it survived and it runs really well. It even lit a 10w light bulb which i wasn't expecting at all and using direct drive for the generator on top of that. A well made CNC version of this would really be awesome, although i think the second stage doesn't add much power.
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