[PSUBS-MAILIST] buoyancy

[hank pronk via Personal_Submersibles]

I was thinking about using CNG (compressed natural gas)  tanks for buoyancy.  The type 4 tanks are carbon fibre and rated for 3,600 psi and very light.  My idea was to keep the tanks full of compressed air so they can withstand the sub depth rating plus a safety margin.   I am liking trawl floats may be better now because they are rated high enough and not air filled.  The CNG  tanks are much cheaper and conveniently shaped.   Hmmm not sure now.??Any thoughts or concerns anyone????Hank
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