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I have been using 18/40 for dives where I will not be refilling the doubles on the boat, or 18/50 for when I plan to get an airtop on the boat. 18/40 has pretty good range and greatly reduced narcosis. this mix is good for the range you mentioned. Steve Hogan -----Original Message----- From: Scubagator@ao*.co* [mailto:Scubagator@ao*.co*] Sent: Monday, September 28, 1998 1:57 PM To: s_lindblom@co*.co* Cc: techdiver@aquanaut.com Subject: Re: Trimix question In a message dated 9/28/98 4:28:15 PM Eastern Daylight Time, s_lindblom@co*.co* writes: > If one were going to use trimix in the deep rec/lite tec range, as many > have been advocating here, for moderate exposures, , say, 100-160', 20-40 > minute bottom, and wanted to have a fairly standard mix to use rather than > doing a different mix for every dive, what would one use? > > - 17/17 poor man's trimix aka heliair > - Cobb's 20/20 > - a nitrox-style hyperoxic trimix, say, 28/30 or thereabouts > - a real trimix, say 17/30 > - other ?? > > How would one plan the dive: > - available tables (which?) > - Cobb's 20/20 tables (which don't exist yet?) > - custom computer-generated tables for each dive > - air/nitrox tables or computers, and ignore the He. > - other? > > I have no opinion or agenda here, just curious about how ready trimix is > for use by the non-hardcore-techie. We just started getting into the Trimix scene...and have hammered out the following as our initial dive... We do a 16/50 first mix....yes that is a high HE mix, but, it gives us a decent Air toppable mix, and the deco we incur as a result of the less then optimum PO2 has proven to be negligible (2-3minutes at 20'). We use if for dives in the 200-220 range, and then the air top gives us a decent mix for the 160-180 range. It also keeps my PO2 w/in some really safe ranges.... This way we also get some good use out of our HE bottles...the idea came from a post that G. Irivine had posted. I have almost gone exclusively to ZPlan...we run the profiles on 2-3 different programs we have Decom Abyss between my dive buddies. Zplan is simple, and gives the output in an easy to read, easy to print and laminate format...and none of us have been bent yet...:-) Just my .02...I'm sure others have different methods. Sean Cary -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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