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At 04:28 =F0=EC 23/9/1996 -0700, you wrote: > > Jess, to make it easy, use this shortcut: compare tables on the dive you= are=20 >doing ( I do not know your gasses). Notice the relationship between the= stops=20 >and between the bottom times - you will see that, like most decay curves ,= the=20 >points , or stops , are related very much like a Fibonnacci sequence. Take= the=20 >relationship of your bottom time to your 20 foot stop - this will depend on= =20 >depth and intermediate gases ( if you are using 130 aed and 1.4 ppo2, with= 1.6=20 >max ppo2 for each deco switch ) and use that ratio to determine your 20= foot=20 >stop. You then take the next Fib number up for your ten foot stop and= reverse=20 >the sequence from 20 feet for the other stops. At 1, do that for the next= four=20 >stops. This is a riot , as it looks like a Bulmann model with deep stops.= =20 > > Or, since you will have lots of time on your hands, do the rough=20 >approximations of the calculations - see Decompression, Decompression Sickness,=20 >and translate it from the German, or just look at the formulas (they are in= =20 >math).=20 > > When I went to Central Florida to take my cave divin', the goobers taught me=20 >this, including the German and the math. =20 > > Here is an example of a Wakulla dive : 285 for 60 (air form 190, 35= from=20 >120, 50 from 70 , and oxy from 20. 14X47 bottom mix: > > 60 bottom time equates to about 55 at 20, so the ten foot stop is 89= =20 >minutes. The 30 is therefor 34, the 40 is 21, the 50 is 13, the 60 is 8, the 70=20 >is 5, the 80 is 3, the 90 is 2, the 100 is 1, 110 for 1, 120 for 1, 130 for 1. I=20 >would then pad them to what I know is correct, which is to pick up the air= at=20 >190 at start breathing that up in one minute increments to the 120 stop, where I=20 >wold spend a few minutes before resuming. I would also do all of the 10 and= 20=20 >at 20, or all three at 30 if there is a way to get out of the water. > > At any rate, you can take this sequence and pad it up after finding= the=20 >basic numbers, and it will be so close to the actual calculation that you= may=20 >never need tables again., or at least not be worrying about overstaying= your=20 >bottom time, or understaying it. You just have to know what the basic deco= =20 >looks like for different depths and mixes, or what you like to do for deco.= =20 > > If I know that an hour at 300 is basicly a five hour deco, I can= also=20 >work out a schedule. In our case, as we approach the flat part of the ongassing=20 >curve, incremental additions to bottom time no longer translate into equal= =20 >chunks of addditional deco, but bvery little more at all, and almost no= change=20 >in the oxygen portion. > > Where you must be accurate to a degree is where you go from dives= that=20 >really require no deco, like 300 for 10 minutes, to dives that mandate it, like=20 >300 for 27 minutes , for example. There is a huge difference between 300= for=20 >15-18 minutes and 300 for 22-30 minutes. From 30 to 60 is pretty linear,= and=20 >then above that it shrinks progressively per bottom time increment.=20 > > I have done every bottom time in this range repeatedly, and am sure= of=20 >these facts in practice. It is amazing what the human body can tolerate. Deco is=20 >your friend if you shape it right, it will hurt you if do not. If you do= too=20 >much, you are hurting yourself. If you need to do too much, don't dive. > > >George M. Irvine III >DIR WKPP >1400 SE 11 ST Ft Lauderdale, FL 33316 >954-493-6655 FAX 6698 >Email gmiiii@in*.co* George, although this answer was not for me, I'd like to thank you for the valuable information you shared with all of us. Friendly, NICK
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