Kent, we have found that they change slightly from issue to issue. We
end up having to actually weigh the tanks in a batch before deciding to
buy. For aluminum 80's we are shooting for the old Luxfer style. Mine
will go neutral at 2000 psi of trimix with the reg and gear on it, which
is what I want so if floats in front of me when I am changing stages.
This is not what the specs call for. Some of the Catalina's issued in
the late 80's are bricks, and the old Walter Kidde's (neutrabuoys) are
so heavy that they make great doubles, as do the old Catalinas. A
reasonalbe Luxfer will be -3 to +3 empty to full, but the idea is -4 to
plus 2, if you can find it for a stage bottle. You wqould not belive the
degree to which the wrong stage bottle slows you down.

 On 104's I have one set that is minus 9 empty with all of the manifold,
bands, etc, and another that is minus 7. 


Kent Lind wrote:
> 
> Jammer Six wrote:
> 
> > What I had hoped to do was to weigh the tanks, full and empty, and work
> > backwards, and determine how much air they REALLY hold (as opposed to how
> > much air the manufacturers and dive store wizards CLAIM they hold).
> >
> > It now appears that that is impossible, given the equipment and finances
> > available to me.
> 
> Now here's something useful that one of the techie magazines could do.
> Measure and publish the actual weights, buoyancy and capacity of all the
> tanks out there (at least the common ones) as well as the weight and
> buoyancy of the commonly used manifolds and valves.  In the same
> article, also dig out all the other tanks questions I hear posted here
> from time to time.  e.g., are the new 104s the same as the old 104s, is
> the Faber-made ScubaPro 95 the same as the Faber-made OMS 98 etc. etc.
> Are you listening Immersed?...SubAqua?
> 
> -Kent-
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