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Hi Phi, I purchased Decoplanner about two months ago, just before I did a series of (for me) long, 70m cave dives. I noticed the same thing as you i.e. I could begin to predict pretty accurately what would happen to the deco schedule by varying the bottom time and, for the first time, I realised what George means when he has been talking about the "shape" of the deco curve. I had previously been using Zplan and it never seemed to keep a constant shaped deco curve or, more importantly, a deco curve who's behavior I could begin to predict in my head. Just for kicks, I ran George's recent 18k dive through Decoplanner and, clearly, he clearly still has a few tricks up his sleeve. Simon ----- Original Message ----- From: Phi Le <phi@sk*.be*> To: Scott Gudmundsen <gudmund@si*.co*> Cc: <techdiver@aquanaut.com> Sent: Monday, April 24, 2000 11:32 AM Subject: RE: Deco in your head ? > Scott, > > From the replies I have received, apparently a few people have already been > doing this for a while with no problem. I just wish that I had done this > exercise sooner. > > Another thing I started to work on is plot all of these deco schedule on *1* > single chart. X-axis is "end-of-run-time", and Y-axis is "depth". Depending > how good your eyes are, you could see *all* of the deco schedules in one > shot. You will see some overlaps, trends, etc., and I will leave you guys to > draw your own conclusions. > > The next step is assume a reasonable surface interval period and add curves > to this matrix. There should be some overlapping with the next depth/BT > curve depending on the SI. > > I know it took a few hours of work, but I won't need to calculate each time > any more. In addition, I have included the mixing PP on the table for the BT > trimix, so I could mix the gas as well without whipping out the calculator. > > Lastly, GUE Decoplanner/Decoblender made it so easy to do this exercise with > its super-easy-to-use interface. It is the best planner I have used so far. > > -Phi > > -----Original Message----- > From: Scott Gudmundsen [mailto:gudmund@si*.co*] > Sent: Monday, April 24, 2000 4:17 AM > To: Phi Le > Cc: techdiver@aquanaut.com > Subject: Re: Deco in your head ? > > > 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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