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Trey, In fear of sounding stupid, yes, I would really like to know how you all came up with this. Or at least point me in the right direction to find the resources about this. Thanks. Chuck R >From: trey@ne*.co* (Trey) >To: "Isaac Callicrate" <icallicrate@ho*.co*>, <mjblackmd@ya*.co*>, ><techdiver@aquanaut.com> >Subject: RE: Oxygen Clock >Date: Sat, 8 Dec 2001 07:35:10 -0500 > > >Isaac, we have found that 12 minutes on, 6 minutes off is the ideal. We >only >do oxygen at 30 feet in a habitat where we have caves that accommodate >this. >Otherwise we do oxygen at 20 feet or slightly less in the water with the >same schedule. If anyone wants to go back over why we do this and how we >determine bottom gas , deco gas and exposure ( or how we arrived at what we >do), I can repeat it . > > >-----Original Message----- > >From: Isaac Callicrate [mailto:icallicrate@ho*.co*] > >Sent: Saturday, December 08, 2001 2:51 AM > >To: mjblackmd@ya*.co*; techdiver@aquanaut.com > >Subject: Re: Oxygen Clock > > > > > >Im not sure why everyone is harping on who this guy is or what he > >has posted > >in the past instead of answering his questions. > >Am I missing something in the charter that says you have to rate an >answer > >or that previous posts disqualify you from getting one? > >Ill give it a shot even though there are probably more informed qualified > >people on this list that should be. > >I see WKPP as crossing the grey area between recreational and > >working diving > >(watch out for OSHA, ADC, and USCG). They are performing dives where more > >compartments are saturated than most other recreational profiles. > >They have > >been diving similar profiles over and over so have built up an amount of > >historical data combined with some doppler research that they have used >to > >make assumptions about their profiles. > >I dont think anyone can say right or wrong yet. If their people > >arent having > >DCS manifestations or O2 toxicity issues than I would definately > >say that by > >being the guinea pig and letting the rest reap the rewards of the > >data they > >are rising above. > >Please do the math on a Navy standard TT 6A with 50/50 @ 165' and 100% @ > >60'. Do it on a Navy single exposure of 100% at 25' for 240 minutes. Why > >havent you e-mailed them? Please CC me when you do. I think it is > >publicaffairs@ne*.na*.na*.mi* > >WKPP isnt the only one that challenges theoretical formulas and > >assumptions > >with historical data. Commercial, military, hyperbaric facilities all >have > >modified the standard thinking on the CNS clock. > >My personal feelings, I wouldnt recommend pushing the clock on a working > >dive when not required. For recreational dives, there is no need > >to push it > >when you are having fun. If you use a habitat or a chamber or > >maybe at rest > >during deco with surface support, the risk is minimized. > >I dont think that taking breaks off O2 is going to significantly > >effect your > >susceptibility to a CNS hit. That is speculation and if anyone has data >to > >prove otherwise I would love to examine and try to push it through to >some > >people. > >About cumulative pulmonary issues, I would absolutely take breaks every > >20-25 min for extended exposures. With increases as neccessary. > >The only big no-no I see is deco on 100% @ >1.6 w/o a ffm, hat, or in a > >controlled environment. I dont think WKPP is doing that. I think > >they use a > >habitat for extended oxygen. Their protocol incorperates breaks between >O2 > >periods. > >What data is NOAA basing their CNS clocking off of? Historical or > >Empirical? > >Do you side with someones calculator or slide rule? > >For technical diving I think everyone should be taught to do a > >personal risk > >analysis for Accelerated Deco vs O2 tox. > >Where do you draw the line? We can use good models for DCS and pretty >much > >say if you do this profile you will get bent. O2 clock is more like > >speeding. Doing 25 is safer than 65 or 100 or 20,000. We dont know > >where you > >cross the line to get in a guaranteed O2 "accident". We need more data. > >All said, everyone enjoy your hit, have the ME e-mail me. > > > >>From: "Michael J. Black" <mjblackmd@ya*.co*> > >>To: Aquanaut Mail <techdiver@aquanaut.com> > >>Subject: Oxygen Clock > >>Date: Wed, 5 Dec 2001 16:26:40 -0800 (PST) > > > > > >_________________________________________________________________ > >Get your FREE download of MSN Explorer at >http://explorer.msn.com/intl.asp > > > >-- > >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'. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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