[diveinfo] [girvine@bellsouth.net: RE: [gavinscooters] What was your "experimental" deco for a given profile?]
Jean-Sebastien Morisset
diveinfo@lists.mvlan.net
Mon, 6 Feb 2006 07:47:30 -0500
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Date: Sun, 5 Feb 2006 16:42:40 -0600
From: "George Irvine" <girvine@bellsouth.net>
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Subject: RE: [gavinscooters] What was your "experimental" deco for a given profile?
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Mozi, I know you know this, but for anyone who may not, the shape of the
deco and choice of gases is a dynamic designed to cover as many
contingencies as possible. In your example, for instance, the use of the 50%
gas in lieu of oxygen at a shallower depth, combined with correct adherence
to the deeper stops, is what allows you to get past an incident where you
have to surface prematurely without getting to use your oxygen while at the
same time essentially making the oxygen less and less necessary by having
done the correct shape of deco in the first place.
Cave divers tend to be massive deco weenies because they can sit there all
day with staged gases, although in my mind the risk of toxing by that method
far outweighs any possible inadequate decompression consequence ( of course
assuming one has no form of shunt, is not bouncing and therefore will not
get a type 2 hit). Ocean divers tend to better appreciate the moving parts
that demand correct deco.
In my case, the dives we were "experimenting" with were so long that to have
done the deco using conventional wisdom would have been impossible due to
the time involved by those methods, and we wanted to find the right way to
deco that would work in all situations for all the right reasons.
I had a cave diving situation where some scumbag stole my oxygen. We (
WKPP ) were diving at Wakulla and had placed our deco gases the day before.
In the meantime, some of the low lifes that were present ( Wakulla is a
state park) thought it would be a good idea to steal our bottles. Rather
than share or get a support diver to bring me another one, I just stayed on
what I was breathing and did the same time I would have done had I been on
oxygen thinking that this was a good time to test the theory where I could
always get a bottle of oxygen and go back if there were a problem upon
surfacing. As it turns out, it made no difference at all. This was not a
long dive, but it was well beyond a minimum deco dive with a 275-300 foot
profile,much like what you are talking about here.
-----Original Message-----
From: gavinscooters@yahoogroups.com [mailto:gavinscooters@yahoogroups.com]On
Behalf Of Muzafar El-Ariss
Sent: Sunday, February 05, 2006 10:50 AM
To: gavinscooters@yahoogroups.com
Subject: [gavinscooters] What was your "experimental" deco for a given
profile?
I did not really know how to phrase my question in the title. So I'll
explain.
Whether it is because you had to or whether because you were using your
self as guinea pig or whether you started to cut more and more for a profile
that you got used to, or cut out one deco gas out, what is the least or an
"experimental" deco you did? However you need to have "gotten away" with the
profile and felt good after. I guess I could have been less PC and asked
what was the craziest deco you ever did for a certain profile
I was experimenting in the Red Sea with Faisal: no O2 and only 80 AL of
50%. Bottom times were 15 minutes at an average of 75-80 meters but we had
hit a 100 meters for like 2-3minutes. Deco "method" was not ratio, it was
following Irvine 's "loose" but clear recommendations on the wkpp. So we
literally curved it out from 80% of ATAs, then at the intersection with the
50%, we focused on O2 window and curved upwards. We did the profile I
believe 3 times and it worked. On one of them though, my left shoulder was
sore, kind of like a bruise which started 5 minutes after surfacing and went
away after 20 minutes.
Although we had learned and been applying "ratio deco", thinking and
implementing the curve as outlined by G on the wkpp.org site makes the whole
thing more thought through and makes you think of each step...
Mozi
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Jean-Sebastien Morisset, Sr. UNIX Administrator <jsmoriss@mvlan.net>
Personal Home Page <http://jsmoriss.mvlan.net/>
Underwater and Travel Photographs <http://www.mvpix.com/>