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Hi Ian, I'd like to find out a little more about where you got a SS backplate, two regs, wings and a Pro 4 canister light (with a battery I presume,) that only weigh a combined five pounds in the water. That seems a little light to me. Are you using one of the "Cut back" SS backplates? Could the wings have had some air trapped inside? Or could it be attributable to some possible inaccuracy in your measuring technique? Take care and dive safe, Scott Some weeks it's just not worth the effort to gnaw through the restraints and scramble up out of the pit. In a message dated 8/5/01 2:21:30 PM, ian@un*.co* writes: << Ignore the tank specs on the web - they're wrong. When I got my dual 104s I took them into the pool and measured their buoyancy - the bare duals (with manifold and bands) with 200psi in them were -15lbs buoyant. The full rig (SS backplate, wing, regs, Pro-4 canister light) was -20lbs at 200psi. That's in fresh water so they'll be slightly less negative in seawater (multiply the numbers by 62.4 / 64). I measured the buoyancy by hanging them from a lift bag, marking the water line on the bag, and then removing them and hanging a bag of lead in their place and seeing how much lead was needed to bring the water line to the same level. By the way, simple physics means that you're going to be lighter climbing up the ladder in HP tanks because the same amount of gas displaces less water when its compressed more, so your overall weighting will be less. But that's a very minor plus compared to everything else where the 104s win out. Ian >> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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