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Drew Conventional wisdom is to use the richer gas last. Running the profile of a 30 m dive for 30 minutes, followed by a 60 minute SI, followed by another 30 m dive for 30 minutes gives an in-water time of 100 minutes for 32 % followed by 21%. However, doing the air dive followed by the 32% gives an in-water time of 92 minutes. The richer gas allows better off gassing of the residual Nitrogen loading from the first dive even though there is initially a greater tissue loading. "Quality of deco is what counts, not quantity" - to quote George. (In the above, the gasses may not be ideal, just used by example.) Dave shimell@se*.co* ---------- From: owner-techdiver[SMTP:owner-techdiver@aquanaut.com] Sent: 22 April 1997 05:38 To: techdiver Cc: techdiver Subject: Repetitive Dive Question Eanx / Air On an upcoming trip I plan on bringing a plain jane and a Nitrox tank. Assuming worst case scenario, fill stations will ALL be doing partial pressure fills. So, without renting a tank, that leaves me with one tank of eanx, and one tank of air. Question: Is it more desirable to make the Nitrox (assuming adherence to applicable MOD/EAD/OxTox limits) dive first, minimizing N2 loading up front, followed by a shallower dive on air, (correctly crossing to air tables for the repetitive dive) OR should I do the air dive first, on air tables, crossing to the Nitrox tables for the second dive? I seem to remember a thread wherein the various Jasons argued back and forth about the advantages/disadvantages of up-front loading, etc. And I thought this would make for some interesting discussion. When I get home to my tables, I'm gonna work up some profiles from both angles, just to see what happens..... Cheers, Drew -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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