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Again, the schedule is wrong. Kent, I have done a few of these, just a few. Honking on oxygen while not doing the correct deeper stops is not the answer. Abyss is giving a worthless deco here. Kent Lind wrote: > > "Lais, Bill" wrote: > > > > This has to be a troll, but just in case it's not: > > > > You're probably going to be breathing the 50/50 deeper than the O2, and > > hence you'll consume more gas. I think we learned about this concept in OW1 > > if I'm not mistaken. ;-) > > > Bill > > Bill, what kind of deco schedules do you run that requires more > consumption of 50/50 than O2? Out of curiousity, I ran a sample > profile in Abyss of a square profile 20 min. dive to 200' on 19/30 with > 50/50 and O2 deco gases. Using a RMV of 0.6 cf/min Abyss > came up with deco gas usage as follows: > > 50/50: 22.3 cf consumed > O2: 22.8 cf consumed > > On a typical deco curve, the shallow O2 stops are so much longer > than the deep 50/50 stops that you end up consuming as much or > more O2 than 50/50. Of course, a much deeper dive profile might > produce different results. But for ocean diving with AL40s the > above profile seems pretty realistic. > > So, I think Ted's question about bottle choice is quite valid, > especially given that it's much easier to fill 50/50 to higher > pressures and O2 is a more useful gas to have in > reserve for surface emergencies. I happen to use two AL 40s > for ocean deco but if I was compelled to use different > size bottles, I'd chose the larger one for my O2. I can jam > 50/50 up to 3000 psi no problem. But I'm very hard pressed > to get more than 2000 of O2 into any bottle. > > Kent Lind > Juneau, Alaska
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