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On Tue, 25 Nov 1997 07:25:31 -0500, you wrote:
>John, you are mixing strokeaphors here: the high ppo2 reference was to
>the suggestion by one no-show bullshitter that you can jack up the ppo2
>througout the deco and get out faster, if you get out at all ( using an
>electronic rebreather with a high setpoint).
This was mainly what I was asking about.I know almost nothing about
rebreathers;I dont know how difficult/possible it is to change a
setpoint in the water.
=46or other discussions of either subject, see the old
>information. By the way , jacking the ppo2 deep is unnecessary and a
>formula for tox later in the deco as well as pulmonary damage. The
>relief gained by using a four or five gas deco with four steps is
>necessary to make it through the whole deco with less damage and less
>chance of tox. The alternative is to jack the ppo2, as on a CCR, and
>then take long back gas or air breaks - too dicey, and unnecessary.
What is the difference between using 4 different deco tanks and
changing the setpoint on the rebreather 4 times?Is this possible or
ptractical?What is the difference between having one deco bottle of
say air and changing the setpoint, or having the discrete deco
bottles?From the tone of the posts, I'm guessing that what people are
doing is setting a high ppo2 at the beginning of the dive, and using
it throughout;IMO obviously unsafe due to tox & pulmo damage as you
mentioned.
Finally, when we're talking about 4 deco gases, what sort of
depth/time exposures are we talking about here?I'm out of date; I
know this, that's why I'm trying to re-educate myself.Since I've wised
up about diving deep on air,and the only trimix I've done was in its
infancy, of the " breath this,stop here,trust me" variety, I dont
anticipate any deep/prolonged exposure dives anytime soon.
For most of the dives I'll be doing in the forseeable future, 30'
is probably the deepest deco stop I'll experience;In the past, I've
dove air for these dives, and 100% O2 for the 10 & 20 stops with air
breaks.What should I be using in your opinion for these types of
decos?I'm a little concerned about the high ppo2 at 20 feet (1.7) even
though it is at rest, and usually not more than 15 minutes.
Thanks
>
> John, what do you do, read old newspapers ?=20
If I did, I might not have to post these stupid questions;im ignorant,
not stupid. the difference is like gonnorhea & AIDS...one's curable,
one's not, even though neither one's desirable.Thanks for the help
seeking a "cure" ;)
>
>
>John Dunk wrote:
>>=20
>> On Sun, 23 Nov 1997 16:50:04 +1000, you wrote:
>>=20
>> > 4) In this same interest you will find that when you graduate to =
real
>> >diving, as in caves, you will not want to accellerate your ppo2 at
>> >lower depths while still being faced with a long decompression at
>> >shallower depths, and making bizarre mixes to do this is a dangerous
>> >mistake (just like the fantasy of holding an accellerated ppo2 on a
>> >rebreather throughout a deco). I am anticipating the thinking that =
the
>> >80/20 crowd would then go to an additional oxygen in cave without
>> >accounting for total exposure, and subject themselves to the risk of =
tox
>> >in the final deco steps. Tox you do not get out of - bends you do.
>>=20
>> Would someone explain' the "fantasy" of holding an accelerated ppo2
>> on a rebreather throughout a deco ' and why it's a fantasy?Are we
>> talking tox here or what?And how does 80/20 supposedly help divers
>> with poor buoyancy control? Hope I didn't come inb too late on this
>> one. Also, someone mind listing the claimed benefits of 80/2?.
>> Thanks
>>=20
>> John Dunk o
>> Tallahassee,Fl o
>> screwloose@el*.co* ____o_____
>> --
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John Dunk o
Tallahassee,Fl o
screwloose@el*.co* ____o_____
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