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Ian, these decos are so severely overstated that a loss of a gas is insignificant. I did a whole Wakulla deco on my 190 bottle right through 20 feet on a 30 minute bt at 300 and never got hit, using a schedule for switching. I kept screwing up the gas switch and not knowing it. I only found out when I got to 20 feet and my O2 was not there, and I then saw that my 120 and 70 bottle were both untouched, and that I was about out of gas on my 190 bottle. So much for deco. In real life, you are btter off moving up and taking the gradient offgassing as bubbles while still underwater than you are sucking on the wrong gas and lengthening the stops, and in real life if you have anything approaching the deocompression time that you are suggesting here, you not only have support with extra gases available, you have buddies to share with. I just did a dive wher I shared the 70 bottle with my dive partner last Sunday, and it worked fine. Ian PINKSTONE wrote: > George, > QUESTION: How would you modify your example in the case of loss of > access to one or other deco gases? > > This is more out of interest of the deco mechanics rather than > actually planning on encountering these situations <g> > > Using JJ's settings for decoplanner, losing the O2 adds 11 minutes > at 20 feet breathing the 50/50, or, if you stick in an extra 10 foot > stop, just 9 minutes in total are added. > > Loss of the 50/50 adds a total of 36 minutes to JJ's deco, primarily > across the 40,30, and 20 foot stops. > > Just for laughs, loss of both deco gases adds 100 minutes to the deco > if you add the 10 foot stop, and without the 10 foot stop, 247 minutes!! > > Thanks for all this good stuff. However, I'm in serious trouble of > getting the sack/divorced, spending most of the day/night armchair > diving with decoplanner <g> Roll on the weekend for the real stuff... > > >I think the problem is the dive is too short for the algorithm. JJ uses > >helium based deco gas on the longer dives, and has told me that he > >believes it shortens them but that the "formula" lengthes the short > >dives. I don't use any softwware, and so do not know for sure. The > >problem is that while JJ is attempting to get out something that > >approximates the deco that we actually do, he and I really only do dives > >that are pretty much off the scale in bottom time length to start with, > >and the rules change markedly. The story there is that just to do a > >normal cave dive in our systems implies bottom times approaching 100 > >minutes for everything at depths from 150 to 300, with a "norm" being > >200 for 100, so again, what works does not always appear optimal for > >short dives, but look at it this way: the big issue with me and JJ is to > >get out of thes dives , and all dives , with no physical damage, so > >while he and I may look like extreme weenies on a short dive deco-wise, > >we look like crash test dummnies on a long dive, but both get out ready > >to rock . > > >Just remember, phsyiologicly , helium is your friend, oxygen is yrou > >enemy. Try to construct your deco so that the one decreases the need for > >the other. Nitrogen is poison - and you need to be treated with oxygen > >after you use it. > > > >I copied this to techdiver since it is a great post by you , and will be > >a question everyone asks. Thanks. I'd go right to JJ for more info. He > >has put a lot into this, and he not only konws every thign I know, he > >knows how to apply it to people other than the two of us. > > >DeepTrimix@ao*.co* wrote: > >> > >> George, -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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