Air breaks

[RichC]

Originally Posted by Andy Kerslake

Rich

Yes I did mean that fast tissues offgas/ongass very quickly and will start on-gassing during the ascent, so if at 6m using 100% I cannot ongas any inerts and my off-gassing is maximised, due to the O2 Window. But if I use 80% or any gas containing Nitrogeen I wll still on-gas the fast tissues.

If you look at any of the deco programmes that produce a tissue pressre graph, you will see this effect.

Andy

Hmmm. But surely you can only ongas N2 if the ppn2 of what you're breathing is greater than the compartmental ppn2. I agree you'll ongas inerts if you spike the N2 for example, by switching from 15/50 to EANX 36 at 30m for example. However, unless you're diving something like 10/80 I can't see how a switch to EANX 80 causes ongassing....

No matter how fast the tissue is (let's say it's infinitely quick) you still need a higher inspired ppn2 than tissue ppn2 to ongas and I can't see how this happens at a shallow switch to EANX80.

[gobfish1]

pull your o2 stop at 5m and your out with less than 100% cns slide baby slide

you need only 15mins at 6m then slide, half your cns load at 5m .83 or 2.2

[Mark Chase]

Originally Posted by milldog

there is talk that on 100% after leaving the water you feel better than if you were on the 80% until the O2 calming effect happens and wipes you out, but thats another thread.

the sort of run times i would be looking at were in the 124 to 145 minutes with ppo2 of 1.4 bottom and 1.6 deco running on 15/55, 21/35, 50% and 100% funny but the GUE planner doesn't do air breaks? anyway this would be a short exposure.

I'm interested to see who would go straight through the 36 Min's on the 100% without breaks

Graham

I dont worry to much about the time i just keep track of CNS. I did over 30mins yesterday on 100% @ 6m Ill check the profile in a bit. My CNS was arround 105% runtime 120mins. This was mainly due to me making a right hash of the PP02 on the decent after spiking it for a cell check. Task loading and Mccr is an interesting game


If I hit 100% CNS and have any significant deco left at 6m Id go on to 5 and 10 min gas breaks on 18/45 or 21/35 depending on the dive. If not ill try and move to 3m. We did this yesterday but conditions were poor and I felt a little ill being bounced arround at 3.

ATB

Mark Chase