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> Reply to: Rebreather toys... >On of the things that I wonder about the advent of rebreathers (and I admit >that _I_ want a rebreather too) is the question of, "I'm at 100 feet and, for >some reason, my unit stops working. My buddy, being another toy afficiando >like myself, also has a rebreather." Now comes the million dollar question: Depends - if you're running a high enough pp02 and don't have any required deco stops (or not very long deco stops) it seems that a 30 or 40 cu ft pony would be the right thing to have. I would worry much more about being inside a ship at 250 feet and have a failure. A previous generation of the CIS Lunar unit was completely redundant (as someone already pointed out), but that has since been dropped. >Can one rebreather sustain two divers for the ascent and decompression hang?? >How is buddy breathing off of one of those? The unit has to work not quite >twice as well as required for one diver. It's more than this. There isn't an "octopus" unit as far as I can see. It seems as though you'd be forced into a buddy breathing scenario. I'm not sure exactly how they would teach this. Since it's a closed circuit system - if you were buddy breathing you'd have to hold your breath until you got the mouthpiece again otherwise I think you'd run out of gas pretty quickly. >Anyone have any thoughts on this? Sure, you can always have a pony bottle down >with you, but from what I saw of CIS-Lunar, the unit is heavy enough without >adding an additional pony bottle. 65 pounds total for the CIS Lunar unit is what was quoted by Rich Nordstrom. I think that a bailout bottle is always a good idea. From some of the pictures that we saw in the technical seminars at the Sea Rovers - 65 lbs plus an additional bottle is *nothing*. There were pictures of people entering the water with up to *8* bottles - twins on the back plus a nitrox for deco plus a small o2 for shallow deco, plus two bottles on each side! Now, admittedly, this is pretty extreme, but when diving deep, it's not unusual to have twins plus a nitrox bottle for deco plus a small pure o2 for shallow deco. >Now, I know that the rebreathers have an additional air/O2/something bottle >because there's no rebreather that doesn't have some loss, but is that bottle >sufficient? Virtually the only time you actually loose air is when you ascend (the resulting expansion of gas leaves the system). This means that you do not consume very much gas. The CIS Lunar system does run on two separate bottles - a pure O2 and a diluent. This diluent can be virtually any gas that you choose. From what I understand, you must tell the computer what the composition of this gas is so it knows how to mix it for you to give you the desired pp02. -Carl-
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