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Your right Will, why the hell would anybody with that bad of bouyancy be even thinking about advanced diving practices???? I have also heard the lame arguement that it allows you to do a 30' stop on the same gas, but that just negates the first arguement they use - that it allows the 20' stop to be safer - you end up right back in the same PPO2 range. Obviously this practice was never really thought out! At 09:33 PM 11/24/97 -0500, William M. Smithers wrote: > >On Sun, 23 Nov 1997, John Dunk wrote: >> Would someone explain' the "fantasy" of holding an accelerated ppo2 >> on a rebreather throughout a deco ' and why it's a fantasy?Are we >> talking tox here or what?And how does 80/20 supposedly help divers >> with poor buoyancy control? Hope I didn't come inb too late on this >> one. Also, someone mind listing the claimed benefits of 80/2?. >> Thanks > >I have to agree on the point about rebreathers, particularly >closed-circuit rebreathers. If you purge a couple of times and >shut off the diluent add valve, you have a 100% o2 rebreather. >The amount of N2 that's being offgassed into the loop is >inconsequential. > >80% "helps" (if such a word is appropriate) a diver with >poor bouyancy skills by not putting them in the rapid >tox zone at 25 or 30ft. > >The actual benefits of 80/20 (besides the above) are nil. >The poorly thought out reasons for use are: > >[1] The tox-depth relation thing, as noted. And I *do* > believe this has a place in training, as long as it > is explained as such. But if the student doesn't have > their bouyancy under control at the end of training, > the instructor has done a very bad job. Or the student > is an idiot, in which case, they shouldn't have been > certified. >[2] You run less tox risk with 80/20, as calculated by > the NOAA "CNS clock" values. This thinking simply reflects > a lack of education. As noted in previous posts, air-breaks > will extend your real tox probability by 50% or more. > >-WIll > >-- >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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