https://www.youtube.com/watch?v=_tBH9SE-Kw8 https://www.youtube.com/watch?v=_tBH9SE-Kw8 tells us that the Archimedes principle (objects move an amount of water

https://www.youtube.com/watch?v=_tBH9SE-Kw8 https://www.youtube.com/watch?v=_tBH9SE-Kw8 tells us that the Archimedes principle (objects move an amount of water that correspond to their weight) is useful to equilibrate the two arms of the wheel in order to have correct balance. edit: and that the amount of energy to do one rotation is just 1.5kWh (@22.5kW) ... incredible!