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You do it any way you want, but I think you will find that any dive that requires 26 cu ft of oxygen will require more than 30 cu ft of 50/50. You do the calculations yourself. Bottles should be permanently marked as to depth (MOD ) and you will find that the deeper dives will require the greater suply of 50%, but not more oxygen. With this in mind, you do not wnat to be shifting everything around for different dives, but doing it exactly the same way, leaving the bottles marked as they were. In addition, the 50/50 is adequate to deco all the way out on without using the oxygen, and in that circumstance you will need more of that gas. If you are doing more than one dive, which is often the case, the 40 cu ft bottle covers that as well. Breathing oxygen is not a good thing - less is best. I think you will discover , when you really get into this, that the formulas used for conventional deco tables are garbage, and that the real shape of proper deco is far different. Dixieboca@ao*.co* wrote: > > >A 40 of 50/50 and a 30 of oxygen makes ocean deco diving a lot more fun > >and much more practical. > > Why? > > It seems to me that you should reverse those and use 2000 psi of O2 in a 40 > and your 50/50 in a 30. > > My logic behind this is the volume of gas you would carry in both bottles > would be approximately the same: The 40 filled to 2000 would have 26.66 cu ft > of Oxygen and the 30 filled to 3000 would have 30 cu ft of 50/50. > > Please explain to me why I would want to do it reversed and carry only 20 cu > ft of O2 and 40 cu ft of 50/50. > > thanks in advance, > > Ted > >
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