Big brain exercise! Vector based bouyancy wheel

[Low-Q]

I have been thinking of a bouyancy wheel which isn't harnessing a weight based inbalance, but rather a vector based inbalance.

If you see the picture, there are two objects inside a tank of water. Both objects are placed on the bottom, so no water can access the very bottom of each object. This example are for reference only - and hard to achieve in real life (However theoretically possible)

One of these objects have no horizontal surface which the water can press upwards, but that has the other object due to the scewed "boxes". So this last object appears as lighter than the other object even if the mass and volume are identical.

Can these two objects be applied to a wheel so it can run under water, but not above water?

There is no weight of water we have to move upwards, there are no forces that prevents the "boxes" to move perfectly inline with eachother in order to loose its bouyancy effect. This actions will change the bouyancy force without applying energy - we have to find out a way to do this in practice.

[broli]

There's always the same amount of surface area that is seeing the same pressure in opposite direction.

[Low-Q]

OK. I see the problem. Now to a more complicated thing. Which of these two objects have the most bouyancy?

I can rotate elements to increase bouyancy?

They both have the same weight and volume, and are under the same conditions as in the previous picture. The gap between the elements are big for better visuality.

Vidar

[broli]

Good one  . So far have no objections.

[spinn_MP]

Think about the "center of gravity" as the "center of buoyancy". And the losses while rotating that floats (friction, water drag,..)