G'day Mates,
This is one project I have ben pursuing and will get back to. It's potential to work can be calculated as torque an work or conservation or angular momentum.
I will be posting more information on this as time goes by. It is based on the work that Johann Bessler left behind.
https://en.wikipedia.org/wiki/Johann_Bessler
I do have a basic buoyancy design I will be working on until I can return this. With Bessler, 6 rpm's is claimed an I think possible.
Jim from up top :-)
an animation;
https://goo.gl/photos/aL55pPihbpFy34U96
it's the pictures on the left and right, the picture in the center needs to be deleted.