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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