Billy, I agree completely. Since I started using Decoplanner, standardised gasses and an EAD of 30m I almost always feel superb after doing deco. About two weeks ago, I did a reasonable 40m dive on Saturday, drove home almost straight afterwards (about 3 hours) and then cycled 100k's very hard on Sunday. I felt full of energy after the dive and absolutely superb on the bike the next day. This is in contrast to when I first started diving, when I would plan diving trips for periods when I wouldnt be training or racing because I knew that I my power output would be significantly less for a couple of days afterwards. I would be interested in the feedback of any other people as to choosing to use 50% from 21m instead of o2 as a deco gas on shallower (say up to 50m) dives. Regards, Simon ----- Original Message ----- From: <billy@bd*.co*.au*> To: Simon Murray <simonm@ho*.co*.za*>; Tech Diver <techdiver@aquanaut.com> Sent: Thursday, June 08, 2000 12:49 PM Subject: Re: Deco gas selection > At 10:43 5/06/00 , Simon Murray wrote: > >Billy, > > > >Maybe something interesting will come out of the dr buttcrack thread. > > > > > I also > > > fill my deco cylinder with 50. You, being ignorant about advanced > > > diving, will be surprised to learn that 50 is the optimal decompression > > > gas for dives down to 60 metres, beyond which the addition of a > > > sling of 02 makes the ideal deco combination for dives to 90 metres. > > > >I have also noticed that when using software that uses gf's to control ascent (in my case > >Decoplanner), the software will give you a shorter deco using 50% rather than 100% in, for > >example, a 30min 40m dive. I assume that this is primarily because you open up the o2 > >window earlier in the dive when you get on to the 50% and because you are starting deco > >deeper due to the gf settings. > > Deco is a lot more organic than any of the planners and algorithms allow > for. So I just use the three principles of good deco on all my dives. > > I run a straight Buhlmann 12, and when Im writing up my tables, I stick > in a one minute deep stop every ten metres to 21, where I add a 2 minute > stop on 50. Then I resume the straight Buhlmann. > > In the water, the result is a much lighter, friskier feeling on the shallow > stops. There, the better I feel, the more inclined I am to decide to shorten > the shallow stops by about the same amount of time that I manually added below > 21. > > Or if I feel heavy or fatigued or unfit, I just leave the shallow stops as > they are. > > This is a noticeably easier-on-the-system deco procedure than any other I > have tried. > > I've recently been diving with someone who was formerly decoing on 80, but > after using 50 from 21 metres instead, he says all the usual post-dive fatigue > has just disappeared. > > If I hadn't found out about deep stops from Richard Pyle and trimix and > good, intelligent deco practises from George and the WKPP, I doubt I would > still be deep diving. Like I said, the organic approach feels much nicer. > > rgds billyw > > > >However I have always choose to use 100% as my first deco gas (adding in 50% and 35% as I > >move deeper or stay longer). The reasons are primarily the same as those for not using > >80% as a deco gas. > > > >Am I missing something missing here ? > > > > >Simon Murray > >South Africa > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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