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John Vanderleest <Vandej@de*.ed*.au*> wrote: >When I first started diving the unit, I found similar problems. It was not a >problem with the unit but the way I set it up. > >The BCD design has a set of tear away covers over the counter lung. >When setting up the unit, you have a natural tendency to pull these cover >tight. This in fact causes a slight reduction in the over all shell space for >the counter lung and consequently prevents the counter lung from >expanding fully. For most divers, this does not cause a problem as the >volume is still sufficient. However, like you, I would over breathe the bag. >I found that by increasing the resistance on the dump valve and by not >tightening the tear away flaps over the counter lung the problem was >resolved. Right! I had the same problem with the Atlantis, but the problem was solved as stated here above. After some dives you will also learn the right breathing pattern, and then you can maximize your bottom time. With the 50% inlet wich means a flow of 7.2 liters a minute, you should be able to dive at least 100min: Tank pressure 200 bars - 13.5 bars intermediate pressure, to make the first stage work = 186.5 bars, 4 liters tank times 186.5 = 746 free liters in the tank 746 liters divide by 7.2 liters a min. gives you 103 min! The best I did until now is 101, so I got close to it. One more thing: I keep the dump valve with the maximum resistance, and I do not overfill the canister. Actually the marker line in the scrubber canister is too high, if you put 1 cm/0.4 inches less scrubbing material, you get 2 results: 1) Decreased breathing resistance (less compression of DraegerSorb) and that means less pressure build up in the exale bag, (less gas will be dumped overboard) 2) Again: less compression of DraegerSorb, which also means less pressure stress on the canister itself, the canister will not be deformed at the top, and you obtain a better seal, (less leaking!) It is very important to remove as much dust as possible from the DraegerSorb, it will make gas flow easier trough the canister, and again less pressure buildup. I own 1 Atlantis and had a lot of dives and teaching with the unit. Stay wet... Roberto
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