> From:          "Glenn E Goettler" <geg@li*.co*>
>
> one thing that has been bothering me is that looking at buoyancy charts,
> 72s have a very similar rating as Al 80s (-2.0 to +3.5 as opposed to -3 to
> +3 for the 80s, according to the PSI "Inspecting Cylinders" book).  this
> would seem to make them acceptable tanks to use as stages if one doesn't
> need 80cf of gas.  similarly they should make good open water, wetsuit
> doubles.  any thoughts here?

This holds for the old PST 72@24*, which are very common and 
show up for sale from time to time for as little as $20. Scubapro 
sells a Faber-made 72@33* that is *very* negative, at -5.6 pounds 
*empty*. This is the cylinder I used in my OW training. I don't know 
many folks who own this beast, but owing to it's extreme weight in 
the water I suppose that's a good thing.

 
Art Greenberg
artg@ec*.ne*
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