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On Sun, 9 Jun 1996, john thornton <johnpt@jo*.de*.co*.uk*> wrote:
>George
>Thanks for the most informative reply.
>AS we have no caves in this part of the world then my interest is in the
>schedules you are doing, I assume that I am right in thinking that your
>water temp is far warmer than ours (9 deg.centigrade at the surface/5 at
>the bottom) but I reckon that you must have some logistic nightmares to
>cope with. From your postings you are not using re-breathers, how much
>gas do you carry and how much do you stage? What software do you use?
>
>I am also a great believer in simplicity linked with safety and find
>that there is no substitute for experience.
>
>> Yes, we have warm water - 68 degress in the caves, 84 in the ocean. The
schedules are interesting. First, we dive a 1.4 ppo2 max (1.6 max at the first
stop of ech gas change), and a 130 AED. We do use air for deco at 190 if there
is vertical clearance and gas on our back. We also use 35%, 50% and O2. Given
that, you can figure all of our schedules and bottle depths. We use straight
Bulhmann with no safety factor, but figure in deep stops starting usually a
couple of atmospheres off of the profile. That lengthens the deco back out from
the zero safety straight version. Lately, we have used a habitat at 30 feet in
Wakulla for O2 . From anywhere in the 70 to 50 foot stop range we break to air
or back gas for twenty minutes, and every twenty minute thereafter for five
minutes.
"Staging to us means carry stages, which we do, but we also preplace
some stages and we preplace safety bottles. We get about 1500-1800 feet per
stage at 300 feet depth, breathing to thirds. If we start to drop the bottle
tat
thirds, it goes down beyond that, and we can not really get the last 300 psi
anyay at that depth, so we generlaly use the whole thing in the round trip.
Back
gas we rarely touch, but have gone to thirds - this is our getoutof jail gas.
If
we get delayed, we use more of it. Usually we paln our gas out in advance, as
well as our time, and we usually hit both right on the money. We tow extra
scooters and have the safety bottles for continghencies, and we run three man
teams who supoport each other.
We have no semi-closed rebreathers, the only kind we would use, but
then we really have not even scrathched the surface of what we can do with
scuba. What we realy need is clear water, something that is very rare in the
system we dive.
For decompression we generally get our tables from Bill Hamilton,
but we also run them on DECOM, or Abyss. We actually have them all, but these
are the only ones that are not complete peices of shit. - G
>>>
>>>
>
>--
>john thornton
>
>
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