Deco Gas Options

GKAM · 17th October 2006, 13:24

Quote: (Originally Posted by EBT)

and still you do this in public?

OK, I rest my case

Quote: (Originally Posted by EBT)

PS. I was asking about HIS training..... anyway... I'll stop beating the horse, it should be tender enough to grill now

I guess we killed any chance of a meaningful discussion continuing here...

Thanks for your posts everyone.

/GKAM

PS. I did in fact think you were referring to me. I guess I'm too trigger happy these days

***ScubaDadMiami*** · 17th October 2006, 14:59

I've done profiles like this on 15/55 back gas instead of 18/45. Why push the PPO2? You never know; you might be delayed on the deeper portion of the dive. Okay, that's my comment there, and I will get back to your question.

Each of your deco gases have a positive and less positive aspects. So, I would go with something in between if I had the ideal choice allowed: 50/25 + 100.

I know a number of people that have started using 50/25 instead of EANx 50. They say that they feel better after the dive than they do by using EANx 50. I never did try it since I made the switch to CCR by the time I thought of making that switch. However, it sounds like it makes good sense.

Second, I don't really like the idea of switching to a fairly high nitrogen mix at deeper depths while lowering the Helium content so much at the same time. I would prefer going somewhat shallower on back gas, switching then.

akscubainst · 17th October 2006, 16:16

I haven't gotten around to trying HE in my deco gasses yet. Though, I understand why it's being done.

I would probably do an 18/40 and carry an 80' of 40% and a 40' of 100%. I like the 40% a little better than 50% since I can move to it at 100' vs. 70'. Of course you could say the same for 32% at 132'.

For me the 40% is a "happy medium", It allows access to another gas a little deeper and a deeper switch to elevate the PO2 earlier and at 20', the PO2 isn't quite as low as it would be with 32% (but it's not quite as good as 50%).

Dives would be planned on Vplanner cons +3. I may also then throw that into Decoplanner and add a few minutes here and there to smooth it out.

Dave

17th October 2006, 13:24	#21 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 251	Re: Deco Gas Options Quote: (Originally Posted by EBT) and still you do this in public? OK, I rest my case Quote: (Originally Posted by EBT) PS. I was asking about HIS training..... anyway... I'll stop beating the horse, it should be tender enough to grill now I guess we killed any chance of a meaningful discussion continuing here... Thanks for your posts everyone. /GKAM PS. I did in fact think you were referring to me. I guess I'm too trigger happy these days __________________ Stay #
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17th October 2006, 14:59	#22 (permalink)
*ScubaDadMiami* Moderator Current Rebreather/s: Optima Other Rebreather/s: Join Date: Sep 2005 Location: Florida, USA Posts: 2,066	Re: Deco Gas Options I've done profiles like this on 15/55 back gas instead of 18/45. Why push the PPO2? You never know; you might be delayed on the deeper portion of the dive. Okay, that's my comment there, and I will get back to your question. Each of your deco gases have a positive and less positive aspects. So, I would go with something in between if I had the ideal choice allowed: 50/25 + 100. I know a number of people that have started using 50/25 instead of EANx 50. They say that they feel better after the dive than they do by using EANx 50. I never did try it since I made the switch to CCR by the time I thought of making that switch. However, it sounds like it makes good sense. Second, I don't really like the idea of switching to a fairly high nitrogen mix at deeper depths while lowering the Helium content so much at the same time. I would prefer going somewhat shallower on back gas, switching then. __________________ Howard Packer IANTD CCR Instructor Miami Beach, Florida CCRDiveTraining.com Last edited by ScubaDadMiami : 17th October 2006 at 15:01.
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17th October 2006, 16:16	#23 (permalink)
akscubainst It's cold here! Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: May 2005 Location: Juneau, Alaska Posts: 64	Re: Deco Gas Options I haven't gotten around to trying HE in my deco gasses yet. Though, I understand why it's being done. I would probably do an 18/40 and carry an 80' of 40% and a 40' of 100%. I like the 40% a little better than 50% since I can move to it at 100' vs. 70'. Of course you could say the same for 32% at 132'. For me the 40% is a "happy medium", It allows access to another gas a little deeper and a deeper switch to elevate the PO2 earlier and at 20', the PO2 isn't quite as low as it would be with 32% (but it's not quite as good as 50%). Dives would be planned on Vplanner cons +3. I may also then throw that into Decoplanner and add a few minutes here and there to smooth it out. Dave
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