Water and gravity: look at this video

[MT]

If we take two divers in one aquarium. And connect them mechanically with the necessary interaction.
When one sinks and contracts, the other will rise and expand. The water level at the top will not change.

Nice try    but not sure you can easily workaround it. If solenoid is engaged in one aquarium then both of them will be sinking.

[kolbacict]

And how do German "rosсh" installations known work?
Or they don't work?

[Willy]

The capacity for compression, of the Cartesian diver, can be limited to a maximum by its design.

Even so, the amount of energy required to re- expand the diver increases with any increase
in the depth of its dive. This is because at greater depths, greater pressure exists outside the
diver.

Nice try    but not sure you can easily workaround it. If solenoid is engaged in one aquarium
then both of them will be sinking.

Two tanks would then be required and instead, a pressure sealed axle passes through and between
the two tanks. Two mechanically linked, insert able pistons and cylinders (one for each aquarium),
would then be required.

[kolbacict]

Two tanks would then be required and instead, a pressure sealed axle passes through and between
the two tanks. Two mechanically linked, insert able pistons and cylinders (one for each aquarium),
would then be required.

Yes, there are maybe many options.
But It seems to me that if such serious people as Rosch did not succeed, if this is a fake, then there is nothing to look for in this direction.

[sm0ky2]

Hi sm0ky2
like your idea, have even believed in it for a while but I see a problem with retrieving back energy inputted in solenoid. As diver sinks deeper, air cap is further compressed by water pressure. At the bottom acts on air cap not only pressure exerted by solenoid but also whole water column above diver. This means air cap has smaller volume than it had at the top. Smaller air cap volume means water level is lower than it was when diver was at the top. And lower water level means less pressure which means less energy pushing solenoid back to initial position.

Yes you are correct. The ratio at which this changes is (approx) 880 milligrams per cubic centimeter
of air volume differential between the upper and lower maximum.
Therefore, there is a maximum height at which the weight of the water column begins to affect
the ability to decompress the air volume. This is one of the maximum system parameters.
And is defined by the elasticity of the flexible part of the bobber. (spring constant)


The compression method must match the decompression capacity.