Don

Good thought. It will be hell to get the rec agency to support.
I ran some of the numbers through Deco Planner and some other calculations.

To more closely track air and without penalties a 21x24 works with END of 80
IAW DecoPlanner and END of 90 if you calc with N2 & O2 as narcotic gases.
Without building the whole tables w/SIT and repet groups. There are several
general mixes that would work well. The Normoxic value would serve the
uninformed or hard headed person who exceeds 130. It would also support and
assist in the transistion of new divers to this type of dive gas and idea.

Type Cost: 21x24 $.215/cuft  21x30 $.252/cuft
AL80 21x24 ~$17   21x30 ~$20
ST95 21x24 ~$21   21x30 ~$24

Cost increase 3 to 5 times without over fills.

David

> -----Original Message-----
> From: Don Burke [mailto:donburke56@ya*.co*]
> Sent: Sunday, October 08, 2000 7:56 AM
> To: Paul Braunbehrens; techdiver@aquanaut.com
> Subject: Re:rec trimix
>
>
> Comments scattered within
>
> --- Paul Braunbehrens <Bakalite@ba*.co*> wrote:
> > I think that this is where trimix computers come in.
> >  Even if it's a
> > good "drop in" gas, I'd still like to track what I'm
> > really using.
>
> Certainly.  It isn't rocket science in any case.  I
> haven't worked out _every_ possibility so the He
> content may have to be backed off a couple of points
> to stay inside the air tables.
>
> A set of rec-tri tables wouldn't seem to be too hard
> to make up for repetitive diving, although PADI would
> probably have to actually come up with a new set of
> surface interval numbers to allow for He instead of
> the Xerox solution used for the surface intervals on
> the PADI EAN tables.
>
>
> > Also, because of O2 Tox there would have to be some
> > kind of an
> > "orientation class" at the least.  If you go down to
> > 160 on air and
> > come back up right away you're stupid, but you won't
> > tox on O2.  A
> > "drop in" gas would need some serious warning if it
> > has a higher O2
> > content.
>
> Yeah, the orientation would be:
>
> "Remember when I told you to stay shallower than 130?
> Well this time I mean it."
>
> You didn't mention the CNS clock, but since we are on
> the subject of O2, I haven't figured out a way to run
> out the clock with 28% O2 without going well into deco
> stop diving or going below 130.  I doubt there is one.
>
> > Don Burke wrote:
> > ~
> > >As variation on the same theme, how about 28/35 as
> > a "drop-in" replacement for air?
> > >
> > >It is good to 130 feet under any conditions a rec
> > diver will see.
> > >
> > >The no stop times are longer than for air.
> > >
> > >The END at 130 feet is about 80 feet.
> > >
> > >The only downside is cost.
> > >
> > >Don Burke
> > >Chesapeake, Virginia
> > >

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