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Hi Dave.
I think I understand what you are saying and how it
would work. Please tell me if my understanding described below is accurate to
what you are saying.
I am thinking of
stainless steel tubing sized to perhaps an aluminum automotive piston head with
its old steel "O" ring grooves now filled with large rubber "O" rings. Am I
correct that your method would seal both ends with screw on caps and
let the piston
freefloat with the threaded oil line located behind
the piston so the piston would compress the air in front of it in the tube, and
the pressurized oil would fill the tube behind the piston and this would be less
buoyant and then you release the oil pressure
and the compressed air would then push the oil back
into the reservoir? Is this accurate to what you meant? If it is, I can't
use it. Remember, I have a wetsub. No pressure vessel. One of the ends of
my ballast tube as I call it, has to be
open to the water so the water can fill in behind
the piston and also be pushed out again in my idea. No oil filling up my
tube volume with attendant oil reservoir. Just a one end open tube, a piston
within it, somehow forcing the piston forward,
compressing the air and letting water in behind the
piston, decreasing air volume to descend, then letting the now compressed
air in the tube force the piston back again,
forcing the water out and increasing air volume to accend. This is what I need
but your idea should work in a pressure vessel but
not for me. What I need to figure out is how to force that piston forward to
compress the tube's air while allowing water in behind the piston into the tube.
I would like to do this with an electric motor that
operated a plunger of some type that would push the
piston inwards but would leave the backside of the piston open to the water. See
what I mean? Any ideas?
Bill Akins.
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