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Guy, For startes, I am an IANTD instructor. I teach my students to think for themselves, and question theories and ideas. I have my students use O2 instead of EAN 80. I also include a lecture on "air breaks", and lecture from many sources of infomation. I always try to include what I am learning as well as new theories being tested. These theories, and my experiences are explained as such. Do I ever recomend to a student that they run their clock to a 1000%? Of course not! You apparently did not read the post correctly. The only divers that I know of that run thier clocks that high, are the push divers of the WKPP. As these are the world's foremeost explorers, they choose to assume greater risks. On non-teaching dives, my buddies and I do not pull any longer than 30 minutes of bottom time at depths in the mid 200's. Of course we get out of the water much faster than many other divers, therefore we do not have as serious of CNS concerns. Bottom times in excess of 30 minutes in these depths exspose us to an unreasonably high risk in the Ocean. Maybe we are right, maybe we are wrong. We always want the option of surfacing if the situation warrants it. Therefore, you can not be frightened of decompression. You always have to be prepared to take a diver with a problem to the surface, whether it means getting type I bends or not. If you do not accept this risk, you should not be doing the dive. Some profiles seem to require tremendously long hangs, that increases the CNS risk which results in further convolution to try to circumvent a non-issue. It would seem that we can't be too wrong as we do these dives all the time without incident. By the way, I am a lawyer and an instructor. Finally, as stated in my prior post, take air breaks every 20 minutes for 5 minutes. I was trying to give you helpful advice, now trying reading and listening instead of talking about what you do not know. You just may learn something. Errol Kalayci www.technicaldiving.com -----Original Message----- From: Guy Wittig <Guy.Wittig@Au*.Su*.CO*> To: errol@ga*.ne* <errol@ga*.ne*>; techdiver@aquanaut.com <techdiver@aquanaut.com> Cc: buckleyd@er*.co* <buckleyd@er*.co*> Date: Thursday, May 14, 1998 9:24 PM Subject: Re: Airbreaks on O2 deco >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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