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Dave, no , he will not. This is typical of Tom : he contracdicts himself three times here, and puts out several dumb and dangerous statements, like " he used O2 at 30 feet with no problems". This is like his "personal comfort level on air". The guy needs to be taken out and shot for this kind of reckless stupidity in my opinion. By the way, when has he ever done a "long deco"? Funny, the guys who do this best and most see it differently. Anyone how wants the real story see "The Bakers Dozen" on 80/20 and for those who want to sed what long deco is, see WKPP.org. Let's get real. David Lennon wrote: > > Trey, > Here he goes again, > Will this idiot ever get it? > > ----- Original Message ----- > From: Tom Mount <TOM.MOUNT@wo*.at*.ne*> > Subject: Re: WKPP B.S. > > > The reason we recommend 80% is due to seeing students have oxygen problems > > in OW on o2 at 20 feet > > > > Personally as I grew up with po2 going from 2 ata to 1.8 to 1.6 I have > used > > oxygen on deco at 30 feet for many years I no longer do that. > > > > If you run the profiles on any program available (including diveplan)there > > is little difference in 100% starting at 20 feet and 80% at 30 feet in > fact > > on many dives the EAN 80 starting at 30 gives a faster profile . > > > > If you switch at 30 feet and later on have to leave the water you would > have > > been breathing a high po2 for a longer duration than if you had waited to > go > > to 20 feet before breathing oxygen > > > > 80 20 should work well for IWR using the Oz method less tox risk > > > > I know of no hits on EAN 80 deco or o2 tox > > > > > > There are even MD's who argue that the 20% inert gas helps maintain lung > > surfactant thus enhancing gas exchange across the alveoli especially on > long > > deco. I will not comment on this aspect but have heard it from several > > including one MD who did 13 years of research on oxygen therapy at Mims > > institute and who is a hypberaic physician and still military reserve > diving > > MD > > > > I also have played with 80 20(helium) and think I feel better following a > > dive this way but admit it may be my imagination > > > > So I will continue to use 100% in cave and 80% in OW on those rare > occasions > > (when teaching) that I use OC anymore > > > > As far as theoretical risk of 80% at 30 vs. 100% at 20 fsw > > > > 80% is not 1.6 until you descend to 33 feet > > > > 100% is 1.61 at 20 feet and 1.7 at 23 feet > > > > Is that significant it could be if a diver is in OW and varies there > depth > > by 3 to 4 feet > > > > On CCR at 20 feet I find it difficult to maintain a po2 greater than 1.5 > > without wasting alot of oxygen. Thus I usually deco at 1.4 to 1.45 and it > is > > easy to maintain even at he 20 foot stop . > > > > My two cents > > > > Tom Mount > > CEO IAND Inc / IANTD > > ----- Original Message ----- > > From: Bruce Partridge <bgpartri@is*.ca*> > > To: 'Richard Pyle' <deepreef@bi*.or*>; 'Jarrod Jablonski' > > <JJ@gu*.co*>; 'Rebreather (E-mail)' <rebreather@nw*.co*>; > > <quest@gu*.co*> > > Sent: Friday, August 25, 2000 11:20 AM > > Subject: RE: WKPP B.S. > > > > > > > The reason I used to use 80% was because it was possible to blend it on > a > > > boat. When I didn't have a haskel, it was impossible to get good fills > > of > > > O2. Even to get good partial fills, we would have to take several large > > O2 > > > cylinders on the boat. Major hassle. So we 80%. It gave us most of > the > > > benefit with much simpler logistics. Even using 80%, it was not unusual > > for > > > us to take 15 T cylinders of O2 and He on a week trip. And since I was > > the > > > only local, I would get to load them on the boat before the rest of the > > guys > > > would get here :( > > > > > > I think the fear for OxTox is not a good reason. Whether you are > > > maintaining 30 feet with 80% or 20 feet with 100%, you have an equal > need > > to > > > maintain depth control. > > > > > > Of course now I have a haskel and use 100%. It's interesting that this > > came > > > up. I'm going to do some open circuit dives this weekend helping a > friend > > > torture (...oops, I mean teach) an advanced nitrox instructor candidate > > and > > > I actually setup a set of twins and filled a deco tank yesterday. > > > > > > The funny thing is, its easier to use 100% when you have a haskel. Just > > > connect it up and go. No need to do the partial pressure blend. > > > > > > > > > > > How can one tout the use of 80% to reduce > > > > > CNS % by > > > > > trivial amounts and then promote constant PO2? > > > > > > > > > > > > > BTW I actually don't know > > > > > where you stand on 80% but it is merely an illustration of > > > > the lack of > > > > > sensibility in general. We are afraid of O2 but wait . . . > > > > lets make sure > > > > > it stays high in all the wrong places. > > > > > > > > > > > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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