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Errol / Doug Thanks for the responses, re training ... My instructor taught me to use 80/20 as per TDI & IANTD training. Similarly, to use NOAA tables which don't include air breaks. So I am trying to work out whether the Florida / WKPP / Stroke-free ideas are worth adopting, or should I stick to the TDI/IANTD way of doing things. You see it is difficult to determine what is substantiated fact versus local mythology. At least we have some confidence that TDI/IANTD teachings have some reasonable basis - in that they may get sued over it and asked to substantiate it. I am not a lawyer, but it would be a brave instructor who tells a student to run their CNS clock up to 1000% without solid agency or industry backing. Guy > Guy, > Read Bennet and Elliot's book on Physiology, there is a section that > talk > about doing 5 min ari breaks every 20 min, and how they have theoretically > run the CNS clock to 1000% (not typo) without incident. They recommend > longer air breaks (hopefully not air, but backgas mix) when doing really > long hangs at 20'. BTW, your instructor should have taught you this. > Errol > -----Original Message----- > From: Guy Wittig <Guy.Wittig@Au*.Su*.CO*> > To: techdiver@aquanaut.com <techdiver@aquanaut.com> > Date: Thursday, May 14, 1998 4:54 AM > Subject: Airbreaks on O2 deco > > > >We have learned from the list that 80/20 is a "stroke mix", and that we > >should deco at no shallower than 6m (20ft) to "open our oxygen window". > > > >I notice that this just about doubles the CNS loading on the dive > profiles > I > >do. So I guess air breaks are in order. (Assuming one has any air to > >breathe) > > > >If you intend to deco at 6m (20ft) on O2 it doesn't take long to get to > 100% > >CNS by NOAA tables. Similarly your CNS drops by 50% in 90min so a 5min > air > >break is going to do zip to reduce your CNS % > > > >So what is the deal ? > > > >How do we factor in the CNS affect of air breaks on 100% O2 deco ? > > > >Do we ignore the CNS clock for deco ? > > > > > >Guy > > > > > >========================================================================= > = > > ,-_|\ Guy Wittig wittig@us*.ne* > t > >/ \ > >\_,-\_+ <- last seen here Sydney, > Australia > > v > >========================================================================= > = > >-- > >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > > ---------------------------------------------------------------------- Guy Wittig 33 Berry Street Phone: 02 9466 9486 Project Manager North Sydney Fax: 02 9466 9411 Sun Professional Services NSW Australia Mobile:0419 435 795 ---------------------------------------------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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