[PSUBS-MAILIST] compensation issue

[hank pronk via Personal_Submersibles]

Yesterday I dove a ship wreck in the clearest water ever, I could see with lights off at 179 feet, and it was overcast.
I changed the compensation bladder from a small inner tube to an old stiff squeeze ball. The sub still had a very small leak, so there is a big improvement.  My theory is that the compensation bladder mechanism needs to offer resistance to allow the lip seal to have pressure against it.  I noticed at Nuytco that the old DW motors have a very short and small compensation hose.  Also the submersible pump motor has a compensation bladder that is spring loaded. My next experiment will be a small stiffer hose that takes more pressure to  initially compress allowing the lip seal to press against the rotating shaft.  
My next dive is to film small White sturgeon that I found a few days ago.
Hank