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This is all great. The reason I used 50% as the first deco gas is that this dive is so short. If it were more than 30 minutes if it were deeper and longer, we would put in a 35% oxygen gas starting at 120 feet for deco, in addition to the 50% and the 100%. This dive is a starting point of the discussion since it is a common profile used by many divers in many areas. Gliviak, Jozef wrote: > > Hello George, > > I'd like to say thanx for your patience in explanation of this issues > and your will to reveal your findings. > > The sample dive to 220ft/25min was great example. And I'm sure all of us > want to continue this. And at the end we would like to know how to create > deco profile in your way for most of ours dives - which I think can be > limited with gas we (I) usually carry - 30L-24L (200-160cuft) back gas + > deco gas. > It would help if you can explain methods how to adjust Z-plan profile > to be close to your way. > > Here I try to write some basic rules (guidelines) which I figured out from > your > posts (apply to dives which mentioned above): > > - descent rate -> in the 50 fpm range > - bottom gas -> helium- the more the better, ideal mix would be heliox > - bottom gas -> PpO2 , the longer is deco on high PpO2 the lower it should > be in bottom gas (typicaly 1 - 1.2 ???) > - bottom gas -> max END is 100ft, lower is better > - ascent rate in depth -> 30 fpm, or the equivalent of a 20 second stop > every ten feet from the bottom > - deco -> start at 80% of the profile in atmospheres > - deep stops -> usually 40 seconds per "stop" from 80% of the profile. > Longer dive = longer deep stops up to 5 minutes per "deep stop" in anything > approaching saturations > - deep stops -> to move out the gas without seeing bubbles deep > - deco gas -> trimix with high PpO2, (ideal mix would be heliox ???) > - deco gas -> start with 50%O2 is better than 32-35%O2 > - deco gas -> first stop with high PpO2 gas longer to use wide oxygen window > and let blood circulate new gas > - deco stop on oxygen -> 12-13 minute with 6-8 minutes off (???) > - ascent from last stop -> very slow, from 3fpm to 1 fpm for long dives > > Please correct me If I'm wrong. > It would be helpfull to go througt few similar examples (e.g. 260ft/20min, > 200ft/30min) > > Best Regards > > Jozef Gliviak > Slovakia -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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