Kevin

Then again, if there was insufficient time between dives to remix then you
could use a 25/30 mix for the first dive and air top to get something like a
22/10 which should be fine for the second dive.  I would see if I could
borrow a small deco cylinder (AKA a small horse - don't want to get into
that debate) with 100% for deco.

David Shimell
Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa.
Email: shimell@se*.co* <mailto:shimell@se*.co*> 

-----Original Message-----
From:	Jeff Waugh [SMTP:jrwaugh@ix*.ne*.co*]
Sent:	Thursday, January 28, 1999 2:05 AM
To:	Kevin Rottner
Cc:	Techdiver list
Subject:	Re: Not a troll or a trap . . .

Kevin, a 25% O2 would suffice seeing how the bottom is at 150', but I will
almost always opt for running something closer to a 1.3 pp of O2 or lower
when
factors such as cold water and current come in to play. So I would probably
run
a 23% O2 max. and 20% He.(100' END). This would seem to be the acceptable
standard among the well advised!
Jeff
Kevin Rottner wrote:

> Dear list:
>
> Not a troll, not a trap . . . just a search for opinions.
>
> One of my favorite wrecks sits on the sand at 143 FSW. She is a Clemsen
> Class Destroyer, DD-227, eight miles off shore in the middle of a major
> shipping lane. Built in 1919 when everything aboard was made of brass and
> bronze. One of the 4 inch guns sits on the sand at 149 FSW. Water is cold,
> Southern CA cold, between 49 and 66 degrees F. Strong current only seems
to
> run through the area AFTER we get on the wreck. Great dive, but . . . .
>
> The few who dive her, do it on air and I have dove her on air, and lately
> have been using EAN 25 or EAN 26. But I am beginning to rethink this.
>
> What gas would you use ?
>
> Now that I have installed a compressor and O2 and Helium aboard my dive
> boat, I'm wondering what you trimix guys would use ?? I was thinking 25%
02,
> 20%  to 40 %He, balance N2 ???
>
> I normally do two dives on her in the morning, rather than one long one,
in
> order to reduce the deco obligation.
>
> Suggestions and opinions please !
>
> Kevin
>
> "Don't forget your history,
>  Know your destiny,
>  In the abundance of water,
>  The fool is thirsty."
>
> Robert Nesta Marley
>
>                              [\]
>                             |
>                             |
> ^^^^^^^^^^^^^^^^^^^^^^
>                                    o           o
>                                  o           o
>                                 o         o
>   _____              o      o
>   (_/\_)        o   o  o
>  =( )=   oo
>
> Kevin Rottner
> Southern California SCUBA
>
> --
> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.



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