Lego meets rpm meets Physik. Volle Möhre. Am Ende 19.000 Umdrehungen pro Minute in Plastik. Von Hand.
No motors, just muscle power, Lego gears and string. The aim is to get the highest RPM. Enjoy!
https://youtu.be/2xkq0Wp8egM
(Direktlink, via BoingBoing)