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> > I agree. Air is not useful for ANY of these deco's where the PPO2 is high enough > > to do any good > > High PO2 is not specifically what you're after on deco (although it may > help in a variety of subtle ways). What you're really after is low PP > inert. More to the point, what you're after is a gas mixture that has a > low partial pressure of the gas that's dissolved in large quantities in > your body. People tend to think in terms of highPO2 = good deco gas > because of the O2 per se, but this is just because O2 is regarded as a > "freebie" gas from a decompression point of view. I guess my point is > that air at your deep decompression stops is just as good as an "ideal" > nitrox, if you're coming off a very high helium-content dive (like > heliox). > Whoooaaa. This is getting circular. I was labouring under the impression that counterintuitively, high ppO2 was exactly what you wanted - not because of the high O2, but because of the low diluent. The point being that shifting from one diluent to another doesn't work; by a number of theoretivcal observations, and more significantly by observation. Just because the flushing route (basically the blood) is emptying of He, does not mean that it can now carry far more He, because now it's full of N. If you fill it with O2, the O2 then metabolises away and lets more He out - high O2, not low He, is what you want. So running two separate algorithms, one keyed to He, one to N2, and ignoring the effect that each has, whilst groovy by that cat Billy of Occam, doesn't quite mix the pickle . Why do the pros no longer shift to Nx? > Sorry for the nit-pick, but I just wanted to respond to the notion that > the PO2 must be high before a decompression gas will "do any good". > How common do you think your preHPNS symptoms are? This is an oddity, and there are several things about Narcs that might apply - i) some old manuals state Narcs is a problem below 50m. Nothing about the lab reports measuring it at 15m. Hence if you get a figure of 500 feet and you find it at 250, don't be surprised. Secondly, Cousteau, ever a genius for stating the blindingly obvious and claiming it for his own, noted that 'intellectuals' suffer more from 'rapture' than others. A higher self awareness and dependance on higher functions is likely to detect any impairment earlier - this *is* observed in divers. Anyone who says he isn't narced at 40m is either i) lying, ii) brain dead, iii) on the Y. What would be interesting to know is if your symptoms are exacerbated by cold, dark, stress, tiredness, physical condition or drug use; as narcosis is. Is it my imagination or is TD a more pleasant place to be these days? Jason > Aloha, > Rich > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'.
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