Take this crap back to rec scuba. This is the tech list, and you know
nothing about it and have nothing anyone wants to hear. You are a complete
idiot, and everyone is seeing that.

-----Original Message-----
From: Lee Bell [mailto:leebell@ix*.ne*.co*]
Sent: Monday, January 07, 2002 9:37 PM
To: MPawlak; techdiver@aquanaut.com
Subject: Re: neutral AL 80's


You're assuming a wrong starting point and I think the change is about 5 lbs
from full to empty (check the Luxfer site if the difference is important to
you.  I'm out of town and it's a hassel to browse from here.)  Since the
tank never gets empty, it's probably closer to 4, but it dosn't make that
much difference.  I don't start 4 lbs heavy.  I never have to deal with the
whole 4 lbs, only half of it.  At the beginning of the dive, I'm about 2 lbs
heavy, which helps my descent but is still within what I can control with
breathing patterns.  At the end of the dive, I'm about 2 lbs light, not so
much I still can't control it with breathing patterns, but enough that if
something should happen, I would ascend gradually rather than sink.  BTW,
I'm not inflating or deflating my lungs to a greater extent, only varying
the pattern of inflation and deflation.  I'll bet you do the same thing for
minor changes in buoyancy, even if you don't know you are doing it.  I can
do this with my PST HP 100s as well, but because they are about 1.5 lbs less
buoyant, it's not a natural thing to do, it's an effort.  I usually start
the dive with just a bit of gas in the wing.

Hopefully I mentioned that I do this in warm water and that, in warm water,
I don't use a wetsuit.  When I add a wetsuit and the buoyancy shift it
causes as depth changes, I also add ditchable weight ( 4 lbs in Halcyon trim
weight pouches threaded on my waist strap) and usually add a bit of gas at
the beginning of the dive to offset the combined weight and compression.  At
the end of the dive, in relatively shallow water, I'm pretty much back to
neutral.

I know this sounds a bit odd in this day and time when the most common
arguments by rec divers is wings versus jackets, but this has been going on
a long time.  How do you think we all managed in the days before BCDs were
common?  8^)  If you still have doubts, I'd be more than happy to
demonstrate any time you are in S. Florida and the water is a bit warmer
than it is right now.

Lee

----- Original Message -----
From: "MPawlak" <pawlakm@ho*.co*>
To: "Lee Bell" <leebell@ix*.ne*.co*>; <techdiver@aquanaut.com>
Sent: Monday, January 07, 2002 12:26 AM
Subject: Re: neutral AL 80's


> Lee,
> You compensate for 6 or so lbs in buoyancy change by shifting your
breathing
> pattern???? That would require constant, close to 3 liters exhale at the
end
> of your dive ;-)) What is the tidal volume of your lungs - 15 liters?:-)))
> Maciej Pawlak
>
> > From: "Lee Bell" <leebell@ix*.ne*.co*>
> The
> > change in my buoyancy due to gas use is will within my ability to adjust
for
> > by changes in breathing patterns alone.
>
> --
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