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#1
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21/35 range is 130' to 160' with an MOD of 190
18/45 range is 170' to 200' with an MOD of 220 So diving to 165' on either gas would be a matter of choice but splitting hairs really...Who plans to 165 and not just 170 or 160? BTW, why was I not invited to this dive planning party? Last edited by Jay Roy; 01-23-2009 at 01:10 PM. |
#2
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If I am doing this correctly, and you do the calculations, MOD of 21/35 at PP02 of 1.4, is 186 fsw. If you do it for 1.2, it's 155 fsw.
What calculations were you using, Joe? |
#3
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Looks right to me...
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#4
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Deco Planner. I don't think Deco Planner considers O2 narcotic. When you run the numbers through you get 21/35, pp02 1.23, MOD 187ft at a depth of 160.
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"Pfft, F%$k that, Wreck scoooter!!!!" J Groff. |
#5
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Thanks Jay.
I told John we always plan for 10 ft increments anyway so 160 or 170. We were talking about doing "G" and the St James etc and got on the subject of gases. I liked the 21/35 schedule better and that is where the questions came from. I agree we are splitting hairs with this example. We are going to continue the planning Sunday after the dive if your interested. Quote:
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"Pfft, F%$k that, Wreck scoooter!!!!" J Groff. |
#6
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Quote:
You could call it 150, 30 min bottom time, 30 mins deco...Go back, have lunch at the Barcelona Cafe Last edited by Jay Roy; 01-23-2009 at 01:24 PM. Reason: Added info |
#7
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Yepp I had 160-165 on the St James. Thats probably where we got the 165ft from.
Quote:
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"Pfft, F%$k that, Wreck scoooter!!!!" J Groff. |
#8
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Gas ranges changed recently according to GUE:
21/35 100-150 18/45 150-200 At least, this is according to the Tech1 course I was able to sit in recently. What you do, is, of course, entirely up to you and the team.
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Oren Your Waterloo region DUI contact person but I'll talk to everyone, who wants to get into DUI and needs help. |
#9
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The MOD are different when using these standard gases for deco purposes. Generaly, we use 1.6 PPO2 for deco gases above 100 feet and 1.4 PPO2 for deco gases bellow 100 feet. Some dives may require changes. Deep deco gases may require a lower PPO2 du to CNS and OTU's which does not really affect us as we don't du these 25 hr epic dives like they do in Wakulla. Steve |
#10
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There's always a tradeoff, but t's better to spend a few more minutes on deco rather than push the CNS limits. The deco time difference between 18/45 and 21/35 is negligable anyway.
Many of us gave up 21/35 for 18/45 years ago just to cut down on the number of deicated cylinders we have ready to go and simplify the logistics of weekend travel planning. |