[PSUBS-MAILIST] Pneumatic Manipulator

[Alan via Personal_Submersibles]

Have thought a lot about pneumatic manipulators.
Hank has commented several times that they are too "spongy".
If you had pressure relief valves or similar in the system set at something
like 30 psi, so there was always a minimum of 30 psi either side of the piston;
would this make it a lot less "spongey". 
You would now need to put an extra 30psi in to get the same force.
It would mean more air, but it is not likely you would be using the manipulator
every dive, & it would be a small quantity compared with blowing a ballast tank.
Has this been done before?
Cheers Alan



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