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Eve? Firstly, the ranged mix is 16% oxygen with 24% to 40% helium. Second, the NAUI RGBM tmix tables are very conservative. This is one of the reasons that George and JJ can get out of the water faster than our published tables would allow. They obviously have a very strong understanding of phase mechanics and how to tweak tables to their bodies. Third, thousands of dives have been made worldwide on these published trimix tables. No reported DCS. Since you imply that you have seen a diver bent on these tables, please notify DAN as well as NAUI Technical Operations. You are correct with regards to the statistical conservatism in the shallow zones (eg 150 to 200). For these depths a higher Rc was used.The shallower the dive the more conservative the Rc. The time differences in the 170 fsw proflile that you point out is rounding on half minutes and if you had even a base understanding of phase modeling then you would realize that this is moot point. Please refer to Brubaks experiments in Stockholm on linear ascents vs. staged ascents. Phase modeling is here to stay Eve and divers around the world are diving extreme profiles based on phase mechanics and returning to the surface faster and healthier than ever before in the history of diving. Could it be Eve that you or your "instructor" have an axe to grind because he washed out of a NAUI technical instructor cross over because he wanted to dive in a single high capacity cylinder with a shorty wet suit and call it technical diving. Yes Eve, I know you. Best regards, Tim O'Leary -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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