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Move up = shallower. You can do the 50% as if it were oxygen timewise, and if you lose that you can do the backgas as if it were 50% and go to the oxygen. What I am saying is do not extend the table because you have the wrong gas - the upper deco steps can be screwed with unmercifully without any real consiequnces, it is the deep ones that you must so corectly. I'll let you in on a little secret - you could do this dive and come right to 20 in quick steps , do 20 minues on oxygen and get out clean - done it, and done al ot worse and gotten away with it. These are the real measures you take in an emergency. Shimell, David (shimell) wrote: > > George > > Most interesting stuff... > > >In real life, you are btter off moving up and taking the gradient > >offgassing as bubbles while still underwater than you are sucking on the > >wrong gas and lengthening the stops, > > Going pack to your suggested deco profile: > > Profile 220' FOR 25 > 16/50, 50% and O2 > > DEPTH TIME GAS > 160-120 1 MINUTE EACH ON BG > 110 1 > 100 1 > 090 1 > 080 1 > 070 5 50/50 > 060 2 > 050 3 > 040 5 > 030 8 > 020 13 OXYGEN > 20-0 8 > > I would like to better understand what you mean by "moving up". > > Following a failure of the 50%, are you suggesting that you continue the deco > as if 50% had been available i.e. follow the schedule but on BG. > > Or are you saying that 16% is so worthless that you would skip the stops and > go straight to O2 at 20', if so what kind of ascent would you do from 70' to > 20' to give your system a chance to cope with the bubbles? > > David Shimell > Email: shimell@se*.co* <mailto:shimell@se*.co*> > Project Manager, IBM NUMA-Q, Sequent Computer Systems Limited, > Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK > registered in England and Wales under company number: 1999363, registered > office as above > > -----Original Message----- > From: kirvine@sa*.ne* [SMTP:kirvine@sa*.ne*] > Sent: Thursday, January 06, 2000 4:48 PM > To: Ian PINKSTONE > Cc: techdiver@aquanaut.com > Subject: Re: I think I understand > > Ian, these decos are so severely overstated that a loss of a gas is > insignificant. I did a whole Wakulla deco on my 190 bottle right through > 20 feet on a 30 minute bt at 300 and never got hit, using a schedule for > switching. I kept screwing up the gas switch and not knowing it. I only > found out when I got to 20 feet and my O2 was not there, and I then saw > that my 120 and 70 bottle were both untouched, and that I was about out > of gas on my 190 bottle. So much for deco. > > In real life, you are btter off moving up and taking the gradient > offgassing as bubbles while still underwater than you are sucking on the > wrong gas and lengthening the stops, and in real life if you have > anything approaching the deocompression time that you are suggesting > here, you not only have support with extra gases available, you have > buddies to share with. I just did a dive wher I shared the 70 bottle > with my dive partner last Sunday, and it worked fine. > > -- > 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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