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Peter, i have all the software you can get on deco, i use proplanner for a couple of reasons.. always have.. if you have more questions call me or email me privately and i'll try to help. it's a great program... dp On Wed, 26 Jun 1996, Tom Mount wrote: > Peter > If you want to generate custom closed circuit (not semi) proplanner will do > that. It is available as well as other deco siftware abbyssis, voyager etc > thro IANTD. In addition IANTD is publishing several sets of waterproof > tables with po2 set points of 1.0 and 1.2 these will allow deco on a set > point of 1.4 for various mixes > > Tom Mount > > At 05:44 PM 6/26/96 +0000, you wrote: > >T.J. > > > >On Wed, 26 Jun 1996 tjm@ea*.ne* wrote: > > > >> Besides, I will have to modify mine for tech-stuff - > >> computer, O.C. bailout, gas switches, etc... Will drive the cost up > >> considerably. > > > >The issue of a computer is an interesting one. All the computers, that > >this slack-jawed "prosumer" has seen, use variations of the standard > >algorithms where the inspired concentration of gas is constant and the > >partial pressure of the gas varies. To get the max out of your CCR, you > >need a computer that takes into account the variation throughout the > >dive of your FiN2 as well as depth. > > > >Now the Pg = Fg x depth equation would indicate that all you need to do is > >substitute the computer algorithm. But the laws of physics, while constant > >sometimes have hidden variables in physiologic systems. What if the > >absorption of nitrogen is dependent not only on the FiN2, but also on the > >ratio of FiN2/FiO2? As the CCR varies the FiO2, this ratio will change. > >e.g., you want to keep your pPO2 at about 1.2 At 50 fsw your > >FiO2:FiN2 is 48:52, at 100 fsw the ratio is 30:70, about half. Why do I > >think this might make a difference? Murphy's Law of Medicine and the fact > >that the solubilities of the two gasses (O2 and N2) are not the same. > >Basically I'm asking if all that matters is the pPN2 or if the relative > >concentrations of other gasses, have an effect on the absorption of > >nitrogen (..like the oxygen window effect). > > > >> Let's do get a couple (of CCRs) and go diving! > > > >Absolutely, but before I plunge to depths where time at decompression > >stops is important, I would like to be sure that the assumptions I make > >about nitrogen absorption when the FiN2 is constant remain true when it > >varies. > > > >I'm hoping that some of the mavens on the net can show this bu(r)bbling > >diver the light. > > > >Peter > > > > > >-- > >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > >Send subscription/archive requests to `techdiver-request@terra.net'. > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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