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Ian makes sense in my book, but if i use a 50% as the only
deco-gas, i would split the two minutes at 6 meters and do
one of them at 3 meters. When using this gas (as opposed to
O2) i prefer to move the last stop up to 3 meters, as the O2-
window at 6 meters on 50% is not impressive, anyway.


Einar


----- Original Message -----
From: <iain.dk.robertson@bt*.co*>
To: <techdiver@aquanaut.com>
Cc: <manos@ma*.co*.cy*>
Sent: Friday, July 21, 2000 12:33 PM
Subject: RE: Table Vs Abyss


> >From: Manos Manoli[SMTP:manos@ma*.co*.cy*]
> >Subject: Table Vs Abyss
> >
> >Iam doing a simple Wreck dive on 42meters this weekend on Trimix.
> >I run the plan on Abyss and then i thought to compare with the iantd
> >table ?
> >So at the end of the day one of them or maybe both are bulshiting me.
> >Why is there so much deference between a simple dive like this ?
> >Which one you would dive ?
> >
> >So the results on 25minutes on 42 meters with 19%he 28%o2 was:
> >
> >Abyss:
> >12 Minutes on O2 at 6 meters.
> >
> >Iantd tables:
> >1 min on 12 meters
> >3 min on 9 meters
> >12 min on 6 meters on O2
> >15 min on 3 meters on O2
>
> The O2 %age is bit high (1.46 on the bottom).
> Both tables seem a bit long.
> The IANTD ones are probably longer because they have to cater for the
worst
> case
> (overweight, unfit dehydrated etc diver). Also, why use O2 at 3m? 6m is
much
> better.
>
> Decoplan, with an instant descent (so a real 25 bottom time), with GFLo of
> 30%
> and GFHi of 100% gives:
>
>   1m @ 15m (on 19/28)
>   1m @ 12m (on 19/28)
>   2m @  9m (on 19/28)
>   5m @  6m (on 100%)
>
> Using a 50% mix for deco gives:
>
>   1m @  21m (on 50%)
>   1m @  18m (on 50%)
>   1m @  15m  (on 50%)
>   1m @  12m  (on 50%)
>   1m @   9m  (on 50%)
>   5m @  6m  (on 50%)
>
> Spending a bit more time at 21m ( to take advantage of the Oxygen
> Window) gives:
>
>   5m @  21m (on 50%)
>   1m @  18m (on 50%)
>   1m @  15m  (on 50%)
>   1m @  12m  (on 50%)
>   1m @   9m  (on 50%)
>   2m @  6m  (on 50%)
>
> (Use these at your own risk. I just ran some numbers through the program).
>
> Given the choice between the Abyss and the IANTD tables, I'd go for the
> Abyss one.
> Given a real choice, I'd use the last set of Decoplan tables.
>
> Iain
> --
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>


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