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Wrolf, This as an arithmetic excersize was a waste of time. For cold water/current/wreck the 130 END is too high. I personally use about 60 feet as my END (what is the big deal of a few dollars more for the higher helium content) to avoid the really stupid act of using tri-mix but still using a cluster inducing END. Get with the program and increase the helium (use it generously) This notion of using a END of 130 without considering the dive is stupid. The 130 END is a comprimise between helium cost and narcosis, a pretty stupid trade. Regards, Steve -----Original Message----- From: Wrolf Courtney [mailto:wrolf@wr*.ne*] Sent: Thursday, January 28, 1999 6:55 AM To: Kevin Rottner Cc: Techdiver list Subject: Re: Not a troll or a trap . . . Just to go over the arithmetic of the "optimal" mix: Depth 149 fsw pressure at depth 5.515151515 ATA ppO2 1.3 (based on cold and current) Desired END 132 fsw ppO2 + ppN2 5 ATA (assuming that O2 and N2 are equally narcotic) ppN2 3.7 ATA ppHe 0.515151515 ATA FO2 23.6% FHe 9.3% FN2 67.1% Rounding off, use: FO2 23.0% FHe 10.0% FN2 67.0% I have no actual opinion on whether you should dive this mix, this is just an arithmetic exercise. If you want the formulae, then you could either visit Jim Cobb's Trimix site, or check out Tom Mount's book. References for either are on my site. -- Wrolf wrolf@wr*.ne* Wrolf's Wreck: http://wrolf.net <http://wrolf.net> Wrolf's Net.Wreck: http://wrolf.net/netmgmt.shtml <http://wrolf.net/netmgmt.shtml> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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