Steve, the stroke agencies can not get the implications of using the
correct combination of gases and sticking to it . Having standard gases
is a huge safety consideration for obvious reasons, and the fact is that
we put 10 years of experimentition over a large group of people in some
extreme diving to come up with this, while the agencies have no clue why
they do what they do other than "personal preference".

I like to see eveyone on the same page as to anything that effects the
safety of the overall diving.

There are so many factors here that these agencies do not see, and that
is why there trianing is so piss poor, and that is why I have to retrain
any gas diver that come to the WKPP before I can let them dive.

Steven Bliim wrote:
> 
> I have recently completed my trimix training and was fortunate to be Billy's
> buddy on the first DIR only dive on the Birchgrove Park - a 50m Sydney
> wreck.
> 
> I had been using 40% and some Pyle stops for my deco prior to mix training.
> I was becoming interested in starting my deco deeper and coming up the last
> 20 to 25 m a lot slower. On my mix training we used 60% for deco, one deep
> stop and a 10 mpm ascent to deco at 9 m - I felt wacked after those dives.
> 
> On the Birchgrove Park dive I had some predive discussion with Billy as to
> profiles and I was happy to go to 50% to commence 2 mins deco at 21m after
> stops at 40m - 1 min and 30m - 1 min. Therafter stops at 12m, 9m, 6m and 3m.
> The 21m stop at PPO2 of 1.6 got my deco going and allowed some cushion for
> the shallower stops. I can only say that I felt on top of the world after
> this and similar dives. I like this method as it keeps the ascent rate from
> depth under control and opens up the oxygen window well down.
> 
> Regards
> Steve Bliim
> 
> -----Original Message-----
> From: Simon Murray [mailto:simonm@ho*.co*.za*]
> Sent: Tuesday, 6 June 2000 21:23
> To: billy@bd*.co*.au*; Tech Diver
> Subject: Re: Deco gas selection
> 
> 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
> >
> >
> 
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