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Deep Dave - since you are an inquisitive guy with technical and medical
training, and hopefully a little more grey matter than the boat monkey
who told you that 80/20 was anything but bulslhit, try this:

Go out in your California swells and drop down to 20. Watch your depth
guage as the waves go over. If it changes, I will fly out to LA - meet
me at LAX - and I wil kiss your ass right there in the airport.

Dave, this is the kind of abject stupdiity that you get from dive
insturctors and they clearly have some kind of Jedi Mind Trick power
over most of you since you are willing to believe absolutely anything no
matter how freaking stupid it is.

Go to the archives for the 13 reasons why 80-20 is bullshit.

Deep1dave@ao*.co* wrote:
> 
> Wow what a day!  I surfed some of my best waves in years, here in Santa Cruz!
>  A 13ft. swell with a period of 20 sec., and a sunny beautiful day, but this
> is another subject.
> 
> First, I want to show my appreciation for all the people that have
> contributed to this list, and Jim Cobb's website.  I have learned more about
> technical diving in the past 2 weeks of reading these resources, than in all
> of my diving classes past NAUI open water.  I can't believe all the crap that
> I bought into in dive shops over the past years.  I am in the process of
> switching gear to be more DIR, and my bottom mix to be Trimix rather than air
> on my dives beyond 100fsw.
> 
> I have two questions:
> 
> 1) in regard to the 80/20 I have been using:  I was taught that this was the
> safer gas in our diving environment because of a fear of O2 toxicity.  My
> plan wasn't to breath it @ 30fsw; I was making my switch at 25fsw, after
> clearing my 30 ft. stop.  Rather, the idea was to avoid pure O2.  I addition,
> the surface conditions can change rapidly in the north Pacific of Carmel, CA,
> and a 10-15fsw deco can be difficult.  I do run all my profiles through
> calculations to watch for my CNS clock, which usually is between 23-37%.  My
> hangs above 30fsw are usually 15-25mins.
> 
> Is this really an issue?  If it is an issue, at what point do I need to
> schedule a break from breathing O2?  Should I breath my 50/50 during the O2
> break and for how long?
> 
> 2) Concerning an ascent from 200fsw after a 20 min. bottom time on 18/40
> Trimix.  Would an appropriate plan be to do short deep stops starting at 150
> fsw, up to 60fsw where the switch to 50/50 is made, until 20fsw, where O2 is
> started?  How is the ascent made from the first deep stop to the switch to
> 50/50?
> 
> Thanks,
> 
> David Horne DVM
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