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On Thu, 14 May 1998, William M. Smithers wrote: > In fact, if you don't apply the trimix weighting scheme for > Heliox, and treat the gasses sequentially, Helium with Nitrox/O2 > deco generally has faster deco profiles than either air/Nitrox/O2 > or trimix/Nitrox/O2, because once you get off the HeliOx and > onto ANY mixture not containing helium, you have instantly > maximized the off-gassing gradient. BTW, if you want to mess around with this yourself, you can trick your Buhlmann software into more-or-less treating Heliox and N2/o2 sequentially by using pure O2 for the entire deco (ignore the CNS% - you'd actually be using a nitrox if it weren't theory). Then breathe o2 on the surface for a few hours before the dive to lower your ambient N2 saturation (if you're using ZPlan, make the first waypoint O2 at 1ft for 299 mins, and set your MaxDecoPO2 to 6.0, selecting 100% O2 as your sole deco gas). Note for the stupid: DO *NOT* ACTUALLY TRY A DIVE LIKE THIS - it's a point of theory only. -Will -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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