A machine to convert gravity to mechanical energy # 2

[AB Hammer]

Nice drawings and well displayed.

[AB Hammer]

I think I will have draw up a buoyancy device or wheel. Just to see how close I may be able to get, knowing what I know about effects.

[mondrasek]

And at the bottom you will have to supply air at pressure equal or greater to the pressure of the surrounding water if it is to enter the cylinders as they expand
NOT TRUE

Right now when your cylinders reach the bottom they will have a hefty internal vacuum with regards to the surrounding external water pressure. That will need to be equalized with equally high pressure air before taking on the additional high pressure air to allow for expansion.
NOT TRUE

Brian, I think your cylinder mechanicals are very ingenious!

If we assume a cylinder that, when collapsed, has equal diameter and length and one square foot volume, then the diameter (and length) would be ~1.0839 feet.  The surface area of one of the circular ends is then ~.9226 square feet or 132.86 square inches.  If the bottom of the system loop where the cylinder is stopped to expand is at 33 feet deep, then the outside pressure on the tank is two atmospheres, or 2 x 14.7psi = 29.4psi.  Distributed across the circular lower surface of the cylinder that is 29.4psi x 132.86 in = 3906 lbs of force pushing up on it from the outside.  If it came down with only one atmosphere of pressure inside there would be 14.7psi x 132.86 = 1953 lbs of force pushing down on the same surface from the inside.  That's a difference of 3906 - 1953 = 1953 lbs of force pushing up on the bottom surface!  Or you can consider it as 1953 lbs of force pulling up from the inside due to the apparent vacuum inside relative to the outside pressure.

Compressed air must be supplied to divers underwater for this reason.  Take the simple "Diving Bell" http://en.wikipedia.org/wiki/Diving_bell for example.

If you do not equalize the apparent vacuum created inside as the cylinders fall, and then introduce compressed air (equalized with the outside pressure at that depth) to fill the volume as the cylinder expands, you must be overcoming the 1953 lbs of force resisting the expansion as well as overcoming the drag of drawing in even more lower pressure air.  I have trouble seeing how this can happen without your cylinders having reached speeds much greater than I can imagine due to gravity while sinking in water before being suddenly stopped.

Thanks,

M.

[brian334]

Mondrasek,
The distance the tanks fall is about 10 ft.
The diameter of the piston is adjustable , it can be made smaller.
Remember the falling tank only weights 3 lbs more than the liquid it displaces. The tank does not half to expand very much to be lighter than the liquid it displaces.

[brian334]

Mondrasek,
A second breather tube could be added.