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Scott, I do not know what you guys are asking here, but I consider "air" impossible to decompress from, so ignore any calcs that involve air. On the other hand, the "values" for helium I know to be bogus, so I ignore them as well. For deco intent and purpose, therefore, I use only the inert gas as conceptual, make it low in nitrogen to avoid physical damage, and deal with only the concepts first of offgasing in solution deep via quick deep stops , then by way of the oxygen window and later pressing of the gradient and progressive expansion of the "M" values, which are falsely fixed without regard for relative partial pressure and in order to get offgasing more quickly in bubble form at those graduated gradients shallow. There is a minumum deco and a maximum deco. Knowing what the shapes for those look like for most depths and then applying the concepts mentioned above is adequate. A decay curve is a decay curve, and phssiology is as important as the numbers. Just play with it a bit and see. Scott Gudmundsen wrote: > > Phi, > > Best post I've read for several months! Thank you for sharing! > > I've often wondered how the heck he does that, too. Apparently George's > brain is programmed for numbers and tables anyway, as he's some kind of > financial/stock broker type number cruncher when his hair is drying and his > tanks are filling... maybe he'll tell us what he does to pay for helium once > he reads this post! > > Scott Gudmundsen > Vernal, Utah > > ----- Original Message ----- > From: Phi Le <phi@sk*.be*> > To: List - Technical Diver <techdiver@aquanaut.com> > Sent: Sunday, April 23, 2000 4:50 PM > Subject: Deco in your head ? > > > I am sure a lot of people already done it, but just want to share > something > > for the guys haven't yet... > > > > A while back, George was posting about he had somehow calculated his deco > > schedule in his head *while* decoing in the water. I thought to myself > "How > > the hell do I learn how to do that ?" > > > > And I still haven't a clue until I did a little project over the Easter > > week-end with the GUE Decoplanner. I wanted to create a set of trimix > tables > > so I don't have to fire up the laptop everytime I need to calculate the > deco > > schedule. > > > > So I decided on a fix MOD PPO2 (1.2), a fix END (30m) and fix 2 deco gases > > (50, 100%) to be used independently of MOD. For each increment of 5m from > 50 > > to 100m, I calculated the deco schedule for different BT in increments of > 5 > > min. I also generated alternative schedules for each step if I had lost > one > > of the deco gases. In addition, I generated tables for each BT gas at PPO2 > > of 1.4 (10m more) in case of needing to go deeper for whatever reason. > > > > After a while, I could "guestimate" the deco schedule of the next depth or > > BT increment pretty accurately. > > > > I am not saying that I could calculate my schedule in my head like George, > > but if I had dropped the deco table (done it before) I could whip out > > another table for another depth or time, estimate it accurately and not be > a > > decoweenie. And I feel that I only need to memorize 2 or 3 tables and > could > > inter/extrapolate the rest easily. > > > > I guess the tough part will be when I add a third deco gas for the deeper > > dive. Wonder how that would affect everything so far ? > > > > If you see any flaws, please comment. > > > > -Phi > > > > -- > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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