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Hi Eric, Thanks for the info on the new rebreather stuff...I'll take a look as soon as I get a chance. > 200' on air for 20 minutes. > > With 100% O2, total dive is 44minutes, 26.9% CNS dose. > With 80% O2, total dive is 43minutes, 24.0% CNS dose. > > 200' on air for 20 minutes, 40% O2 in travel bottle > > With 100% O2, total dive is 41minutes, 28.5% CNS dose. > With 80% O2, total dive is 41minutes, 25.2% CNS dose. > > Looks like a definate WIN for 80%. Less deco time, less O2 dose. Lemme get this straight: The profiles compare 80% O2 at 30, 20, and 10 foot stops with 100% O2 at 20 and 10-foot stops. If that's the case, then I see 100% O2 as the winner. My logic is this: it appears as though the Maximum PO2 partial pressure exposure is essentially the same for both (1.6), and the decompression times and CNS "dose" are essentially identical (the differences you list are physiologically meaningless). Oxygen is the winner, then, because you don't have to deal with mixing compressor-air with high-pressure pure Oxygen. (i.e., you don't have the risks and costs associated with blending Nitrox-80). Just my 2cents... Aloha, Rich ******************************************************************* Richard Pyle deepreef@bi*.bi*.ha*.or* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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