SIBAP

[BasementExperiments]

No, it works in the opposite direction.
When the airtank falls then the weight has no leverage to keep it up. The weight will fall and push air into the submerged airtank. When this is happening, there is slack on the line.
Once the airtank fills to a certain bouyancy it will pull away from the magnets holding it in place (the bouyancy is greater than the pull of the field) and rise to the top lifting the weight with it.

Once the tank hits the surface or a certain area it is deflated, perhaps simply by the connecting line pulling open a valve at the top. Once it looses air again it drops to the bottom, again giving slack on the line where the weight drops again, repeating the cycle.

[hartiberlin]

Hi,
just
try to calculate from these formulars:

http://en.wikipedia.org/wiki/Hydrostatics#Hydrostatic_pressure

how much air pressure you need to overcome the hydrostatic water pressure,
e.g. in 10 Meter deepth of water.
Then compare it with the weight generation of air pressure.

I guess the buoyancy force is always smaller than the gravity force to
generate the needed air pressure to overcome the
hydrostatic water pressure.

Just do a few examples and post the calculations.

Regards, Stefan.

[hartiberlin]

that would entirely depend on the inner diameter of the air line. The air line isn't needed to be very wide, actually the smaller the better.

No,
actually not.
This is the hydrostatic paradoxon..

It does not depend on the diameter size of the hose,
it does only depend on the height (or deepness in water ) of the hose...
unfortunately....

[dirt diggler]

that would entirely depend on the inner diameter of the air line. The air line isn't needed to be very wide, actually the smaller the better.

No,
actually not.
This is the hydrostatic paradoxon..

It does not depend on the diameter size of the hose,
it does only depend on the height (or deepness in water ) of the hose...
unfortunately....

I'm not sure this is entirely true as there is air friction that may be more noticable in a smaller hose(say 1/4 inch) compared to a hose that is 1 inch. just try blowing thru a piece of  automotive brake line then thru a garden hose.  big difference.

[hartiberlin]

P.S. See it this way:
If you open the valve at the bottom of the air valve going into the
water, the water pressure is so strong, it wants to move the water there into the air container and
as high as the other water is in the water container.

Regards, Stefan.