Acoustic measurement of rpm: around 13000.
And from that other video (youtube.com): ~33000.
Acoustic measurement of rpm: around 13000.
And from [that other video](https://www.youtube.com/watch?v=zs7x1Hu29Wc): ~33000.
Acoustic measurement of rpm: around 13000.
And from that other video (youtube.com): ~33000.
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