My web site was meant to be a general overview of Trimix and and to =
provide information which will explain why Helium is a good thing. That =
particular piece of information was derived from an article in Diving =
Medicine, by Alfred Bove and Jefferson Davis.

I suspect this more of a problem with commercial saturation divers who are =
"blown down" to depth rather rapidly, far faster than a normal scuba diver =
descending. Certainly I have never experienced it, but it is listed as a =
side effect of Helium as is the HPNS, another thing you are unlikely to =
encounter. I highly recommend you get this book, it is a gold mine of =
information.

 Jim

On Thursday, May 31, 2001 11:35 AM, Steve <sfkenney@ea*.ne*> wrote:
>Trey at trey@ne*.co* wrote:
>> Steve, you have been fed total bullshit - nothing you are saying is =
true
>> other than that for any gas, slow ascents are obviously
>better,
>
>I got some of my information from the web site listed and you are quoted =
in
>the article.=20
>
>Steve
>
>http://www.cisatlantic.com/trimix/descrip.htm
>
>So why helium?
>Helium is a non-toxic, colorless, odorless, tasteless, inert, lightweight
>and nonexplosive gas. To quote George Irvine head of the WKPP: "Helium is
>our friend".
>Advantages of helium:
>-Narcotic effects are nil.
>-Due to its lower density, breathing resistance at depth is significantly
>reduced.
>-Helium off-gasses rapidly and it does not enter slow tissues as readily =
as
>nitrogen.
>Disadvantages of helium:
>-Helium conducts heat 5 times faster than air.
>-Hyperbaric arthralgia, an arthritic-like stiffness, can occur during
>descent with some divers.
>Helium has been used for diving as far back as 1938. The first true test =
of
>heliox diving was the rescue of the submarine Squalus in 1939 in 240 fsw.
>Since then helium has been used in dives to more than 2000 fsw.
>As helium is less dense than nitrogen, it enters and leaves the tissues
>faster than nitrogen. Paradoxically helium requires a little more decom =
time
>with short dives than air, but less decom time on long dives than air. =
The
>key to using helium is slow descents and slow ascents. Additional deep =
stops
>are required when ascending on helium mixes.
>Due to helium's ability to leave tissues rapidly, having 2 or more stages,=

>for example 50% nitrox and 100% O2, allows you to off-gas helium faster =
than
>you could nitrogen.
>There is a situation which can occur in depths past 400ft. called High
>Pressure Neurological Syndrome (HPNS). This manifests itself with tremors,=

>muscle twitching and coordination difficulties. Adding a small amount of
>nitrogen to your mix can alleviate these symptoms. But then, what are you
>doing down there, anyway?
>
>
>
>
>on 5/31/01 2:52 AM, Trey at trey@ne*.co* wrote:
>
>>=20
>> Steve, you have been fed total bullshit - nothing you are saying is =
true
>> other than that for any gas, slow ascents are obviously better, but =
from
>> reading your deep air bullshit, you have many miles to go on the =
learning
>> curve before anyone can even discuss this intelligently with you. I see =
that
>> idiot Zurl is copied here. He is a big proponent of deep air diving and =
has
>> much experience doing it. He has written articles in local scuba =
magazines
>> extolling the virtues of it so that more people can get killed doing it.=

>> Start with this moron and maybe you two can figure it out.
>>=20
>> -----Original Message-----
>> From: Steve [mailto:sfkenney@ea*.ne*]
>> Sent: Thursday, May 31, 2001 12:40 AM
>> To: Jim Cobb; Z; Fltechdiver; Tech Diver
>> Subject: Re: TriMix Computer Vote RESULTS
>>=20
>>=20
>> I take it you are the webmaster on the trimix site? Very good work BTW, =
it's
>> a home mixers dream come true. I would like to try some helium diving =
this
>> year. I'm somewhat concerned about the side effects, stiff joints flu =
like
>> symptoms, problems from rapid ascents. Why do you need to make slow =
descents
>> when using helium? With all the talk about the danger of deep air, I've =
set
>> my limit at 150'. I want to learn to dive helium without computers and
>> without cutting tables, just have the knowledge to calculate on the fly =
as I
>> go.
>>=20
>> Steve
>>=20
>>=20
>>=20
>> on 5/28/01 5:25 PM, Jim Cobb at Cobber@ci*.co* wrote:
>>=20
>>> Once you cut your tables you need to carry them down somehow. Some =
like to
>>> tape them to flat plastic slates. Others combine a bottom timer to a
>> conformal
>>> plastic slate. Mike Zurl contributed a nice page on how to make one =
where
>> you
>>> don't need to use duct tape to write your numbers on.
>>>=20
>>> Jim
>>>=20
>>> On Sunday, May 27, 2001 10:42 PM, Steve <sfkenney@ea*.ne*> wrote:=

>>>>=20
>>>> Jim, what do you mean about your new wrist slate section? I'm not
>> positive I
>>>> want to get way into tech diving because I'm 48 years old but I do =
want
>> to
>>>> learn about it. Decompression theory is interesting and it's affects =
on
>> the
>>>> body is relevent to me even if I don't go real deep. I may decide =
down
>> the
>>>> road to volunteer for a recompression chamber.
>>>>=20
>>>>=20
>>>> 1) Tables
>>>> 2) No tables and no computer
>>>> 3) Math equations??
>>>> 4) Tabletop software programs
>>>> 5) Wrist Computers
>>>> by order of preference
>>>>=20
>>>> Steve
>>>>=20
>>>> on 5/27/01 10:35 AM, Jim Cobb at cobber@ci*.co* wrote:
>>>>=20
>>>>> Get yourself a cheap laptop, Decoplanner from www.gue.com, see my =
new
>> wrist
>>>>> slate section, purchase a uwatec bottom timer. Then take the $1000 =
you
>> save
>>>>> and get yourself a proper set of wings, doubles and regs. If tech =
diving
>> is
>>>>> what you want to get into, then you are all set. If you simply have =
to
>> get a
>>>>> computer for non-trimix deco dives then go for the DiveRite or =
Suunto
>> Viper
>>>>> which has a gauge mode you can use for when you do the deep stuff.
>>>>>=20
>>>>> Jim
>>>>> -------------------------------------------------------------------
>>>>> Learn About Trimix at http://www.cisatlantic.com/trimix/
>>>>>=20
>>>>>> From: Steve <sfkenney@ea*.ne*>
>>>>>> Date: Sun, 27 May 2001 09:43:57 -0700
>>>>>> To: Jim Cobb <cobber@ci*.co*>, Z <mzurl@be*.ne*>,
>> Fltechdiver
>>>>>> <fltechdiver@mikey.net>, Tech Diver <techdiver@aquanaut.com>
>>>>>> Subject: Re: TriMix Computer Vote RESULTS
>>>>>>=20
>>>>>> I didn't see the post where I could vote on computers. I don't =
think I
>>>>>> would
>>>>>> buy one for $1900 unless I was a professional diver and they were
>> proven to
>>>>>> work well. Are there two brands on the market now, Dive-Rite and =
Abyss?
>> I
>>>>>> believe they monitor three gases and you can switch gas on the fly,
>> sounds
>>>>>> impressive.
>>>>>>=20
>>>>>> What are the options for a beginner tech diver?
>>>>>>=20
>>>>>> 1) Tables
>>>>>> 2) Tabletop software programs
>>>>>> 3) Wrist Computers
>>>>>> 4) No tables and no computer
>>>>>> 5) Math equations??
>>>>>>=20
>>>>>> Steve Kenney
>>>>>>=20
>>>>>>=20
>>>>>>=20
>>>>>>=20
>>>>>> on 5/25/01 3:54 PM, Jim Cobb at cobber@ci*.co* wrote:
>>>>>>=20
>>>>>>> Yes, this vote shows that there are 21 IANTD instroketors on Mikey'=
s
>> list
>>>>>>> here and 4 normal people. This might explain why you boys seem to =
have
>>>>>>> such
>>>>>>> a hard time filling tech trips down there, not enough trimix
>> computers...
>>>>>>>=20
>>>>>>> Anyway, moving right along...
>>>>>>>=20
>>>>>>> -------------------------------------------------------------------=

>>>>>>> Learn About Trimix at http://www.cisatlantic.com/trimix/
>>>>>>>=20
>>>>>>>> From: "Z" <mzurl@be*.ne*>
>>>>>>>> Date: Fri, 25 May 2001 18:23:09 -0400
>>>>>>>> To: "Fltechdiver" <fltechdiver@mikey.net>
>>>>>>>> Subject: TriMix Computer Vote RESULTS
>>>>>>>>=20
>>>>>>>> ALL -
>>>>>>>>=20
>>>>>>>> At this time, it appears anyone who was going to vote did so.  As =
a
>>>>>>>> result,
>>>>>>>> I have decided to release the results of the first DeeperStuff
>> Technical
>>>>>>>> Dive Debate.
>>>>>>>>=20
>>>>>>>> Question:
>>>>>>>> Would you use a wrist-mounted TriMix computer?
>>>>>>>>=20
>>>>>>>> RESULTS:
>>>>>>>>=20
>>>>>>>> NO     4
>>>>>>>> YES    21
>>>>>>>>=20
>>>>>>>> YES BY A LANDSLIDE !!!
>>>>>>>>=20
>>>>>>>>=20
>>>>>>>> Z's Analysis:
>>>>>>>> To some, it might appear that voter turnout was low. I believe =
this
>> was
>>>>>>>> due
>>>>>>>> to a small population of trimix rated divers to begin with.  =
Since
>>>>>>>> FLTechDiver is monitored by hundreds' I suspect many were afraid =
to
>> vote
>>>>>>>> due
>>>>>>>> to their lack of experience in this area.  Although I will not
>> divulge
>>>>>>>> the
>>>>>>>> names of those who voted, many are well respected "mix" divers, =
and
>> at
>>>>>>>> least
>>>>>>>> a couple  admitted currently owning a "mix" computer.
>>>>>>>>=20
>>>>>>>> I will admit the landslide surprised me.  I figured we were in =
for a
>> much
>>>>>>>> closer tally.  This also confirms what I have always believed, =
that
>> many
>>>>>>>> monitor these lists without voicing their opinion which is in =
direct
>>>>>>>> contradiction to a few VERY vocal participants.
>>>>>>>>=20
>>>>>>>> Someone asked me how I was going to vote.  For the record, I said
>> "YES"
>>>>>>>> (if
>>>>>>>> I could find a mix computer I liked that is)!
>>>>>>>>=20
>>>>>>>> Z
>>>>>>>> www.deeperstuff.com
>>>>>>>>=20
>>>>>>>>=20
>>>>>>>> =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>>>>>>> To contact the list administrator, email
>>>>>>>> Mike Rodriguez at mikey@mi*.ne*
>>>>>>>> To UNSUBSCRIBE from this list, send a message to:
>>>>>>>> listserv@mi*.ne*
>>>>>>>> and in the *BODY* of the message type:
>>>>>>>> unsubscribe FLTechDiver
>>>>>>>>=20
>>>>>>>=20
>>>>>>>=20
>>>>>>> --
>>>>>>> Send mail for the `techdiver' mailing list to
>> `techdiver@aquanaut.com'..
>>>>>>> Send subscribe/unsubscribe requests to
>> `techdiver-request@aquanaut.com'.
>>>>>>=20
>>>>>>=20
>>>>>=20
>>>>>=20
>>>>> --
>>>>> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.=
com'.
>>>>> Send subscribe/unsubscribe requests to
>>>> `techdiver-request@aquanaut.com'.
>>>>=20
>>>>=20
>>>=20
>>>=20
>>=20
>> --
>> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>> Send subscribe/unsubscribe requests to
>`techdiver-request@aquanaut.com'.
>>=20
>
>


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