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This will get you killed and your heirs will sue me, but here goes.... Insert every possible disclaimer here. As a matter of fact, the person typing this is not even Roger Carlson, but some scoundrel who got his password through judicious use of a crowbar and a blowtorch, which is what should happen to anyone who even thinks of building the device discussed in this post, which is here merely to spur theoretical discussion, certainly not to ever actually get built. But if you know enough to build this thing and use it right, there's more than enough info here. If you don't, and you build one anyway, well, Darwin had a saying. Go ahead and sue him, why don't you. This is something I thought of at tek. If you only want to breathe oxygen on the surface, and you are fully conscious and able to manually control life support equipment, it's not hard to build a simple 100% O2 rebreather. I first thought of a system with a really simple loop, but then I came up with an even simpler system. I later did some research, and found that anesthesiologists once used this exact system to conserve their expensive gasses, and called it a push-pull system. It's just a breathing bag in between an O2 delivery system (simple valve, or if you're clever and make a bag that won't fully collapse, a demand valve) and a cannister of scubber with a mouthpiece on it. You fill the bag, and your lungs pull the O2 through the scrubber, then push O2, CO2, and N2 back through the scrubber into the bag. You must be careful to flush out any N2 initially in your lungs or being offgassed while you are using the system, and you must get the cannister as close to the mouthpiece as possible to avoid dead air space. I'm not sure how high breathing resistance will be, or the liklihood of pulling scrubber dust into your lungs. Some kinds of scrubber do turn color when they're saturated with CO2; it might be interesting to use a that stuff and a clear cannister. I have not built one of these. Silly of you to even ask; this is not for building. It's just for discussion. I have no idea how big a bag to use, how much scrubber, where to get scrubber, or anything like that. This should make your surface O2 last a long longer, which is nice for those marginal cases when you might not use O2 if you are stingy with it. It also keeps you from filling your boat with O2 and increasing the risk of fire. On the down side, and don't ask me how, it will get you killed and me sued. #----------------------------------------------------# Roger "GravyBoy" Carlson H 310-frogger Somewhere off Hermosa Beach, CA W 310-813-0858 Roger_Carlson@at*.sp*.tr*.co* F 310-812-1363 New and improved: http://darkside.sp.trw.com:21 #----------------------------------------------------#
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