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George,
Thanks for your email. Let me know if you need any
"quick" calcs/schedules for pet projects. One thing that
(always) bothers me these days is the insertion of deep stops
into Haldane models, without proper accounting of the bio-mechanisms.
Reducing gradient factors (GF) in Haldane models can buy some safety, but
the approach still suffers from Haldane aberrations -- especially at
the shallow stops where "you can't reduce the GF correctly". Phase models
iterate over the full profile for consistency with gas dynamics. Enough
said -- you have heard it before.
Stuff at LANL is "closed door" -- we do some chamber stuff as
you might expect (know) with Spec Ops. As Tim suggested, how about
some commercial facility like OC?
Stay in touch -- bueno.
BW
>Tim, I know. Bruce's stuff is excellent, and compares closely to what
>Jarrod and I actually do for our own account but can not recommend to
>others who do not have the same extreme physiology that the two of us
>have. The only place we differ from Dr. Weinke is in stops that approach
>a gas switch - I blow them off almost completely ( like the 40 foot stop
>on a very long dive), while Bruce extends them quite a bit. The only
>differnce is that I accept the offgassing in bubble form at that point
>in the deco as a vlaid method, while Bruce is avoiding that and Bruce's
>way is a lot smarter unless you are bullet proof in the precondition
>department, which I am as are most of the WKPP gas divers - that is by
>process of eliminiation - you can't do what we do and have any preco's.
>
> Yesterday we had an impromptu deco contest . I thought Werner had
>gotten ahead of me ( we were totally blacked out from 120 feet to the
>surface) and I abreviated about 40 minutes to beat him , but it was not
>Werner, it was Nanci LeVake who has about 80 minutes less bottom time on
>her dive than I had on mine, but it make no difference.
>
> If you have no preconditions, Weinke's stuff is solid gold and is far
>more correct than any of the previous models in my opinion, and can be
>fudged in the low ppo2 range for the good offgassers.
>
> I like what you guys are doing out there with this - how about let me
>come out and let's see what the human body can take in a chamber test.
>
>
>Nauitec@ao*.co* wrote:
>>
>> George,
>> This was supposed to go to you and JJ for comparison. 50-50 Heliox and 50-50
>> Nitrox begin at 70 fsw. This a true phase model with compartment
>>integration.
>> Compartments are 1 through 720. However with your applications (depth and
>> duration), phase within the algorythm is predominant.
>>
>> Tim O'Leary
>>
>> ---------------------------------------------------------------
>>
>> Subject: WKPP 220/20 RGBM TMX Schedule with He or Ni Switches
>> Date: Fri, 7 Jan 2000 17:07:17 -0700
>> From: "Bruce R. Wienke" <brw@la*.go*>
>> To: techdiver@aquanaut.com
>>
>> Gentlemen;
>> >> >>> >
>> >> >>> > Tim O'Leary passed your "deco help" message and specifically a
>> >> >>> > request for a RGBM trimix schedule calculation for tmx16/50 at
>> >> >>> > 220 fsw for 20 minutes, with a switch to either 50/50 nitrox or
>> >> >>> > heliox at 70 fws, and pure oxygen at 20 fsw. For simplicity,
>> >> >>> > ascent and descent rates are 30 fsw/min. Notice deeper stops
>> >> >>> > within phase RGBM, and total times less than haldane of
>>comparable
>> >> >>> > conservatism -- moderate conservatism in this case.
>> >> >>>
>> >> >>> We are in the process of publishing some trimx and helitrox
>> >>Tables
>> >> >>> for ranged mixtures. We have been diving RGBM schedules for
>>awhile,
>> >> >>> here at LANL and NAUI Tec. We can do other schedules (within
>> reason, of course).
>> >> >>> >
>> >> >>> > Bruce Wienke
>> >> >>> >
>> >> >>> > dive number = 1 altitude = 0.00 ft
>> >> >>> >
>> >> >>> > RGBM Trimix Version
>> >> >>> > B.R. Wienke/Los Alamos National Laboratory
>> >> >>> >
>> >> >>> > --dive profile--
>> >> >>> >
>> >> >>> > surface breathed nitrogen = 0.79
>> >> >>> > manuever 1 depth = 0.00 fsw time = 0.00 min
>> >> >>> > manuever 2 depth = 220.00 fsw time = 3.67 min
>> >> >>> > manuever 3 depth = 220.00 fsw time = 20.00 min
>> >> >>> >
>> >> >>> > trimix = 0.50 helium 0.34 nitrogen switches = 2
>> >> >>> > switch 1 depth = 70.00 fsw helium = 0.00 nitrogen = 0.50
>> >> >>> > switch 2 depth = 20.00 fsw helium = 0.00 nitrogen = 0.00
>> >> >>> >
>> >> >>> >
>> >> >>> > --adjusted rc = 0.757 micrometer--
>> >> >>> >
>> >> >>> > - excursion to depth = 220.00 fsw -
>> >> >>> >
>> >> >>> > - time at inital depth = 20.00 min
>> >> >>> > --------------------------------------------
>> >> >>> > - stop - depth - wait - tissue - tension
>> >> >>> > - 1 - 160.00 - 0.00 - 1.67 - 172.60 -
>> >> >>> > - 2 - 150.00 - 0.00 - 1.67 - 170.42 -
>> >> >>> > - 3 - 140.00 - 1.00 - 1.67 - 154.86 -
>> >> >>> > - 4 - 130.00 - 1.00 - 3.33 - 144.95 -
>> >> >>> > - 5 - 120.00 - 1.00 - 3.33 - 137.43 -
>> >> >>> > - 6 - 110.00 - 1.00 - 3.33 - 130.02 -
>> >> >>> > - 7 - 100.00 - 1.00 - 3.33 - 122.69 -
>> >> >>> > - 8 - 90.00 - 2.00 - 6.67 - 111.32 -
>> >> >>> > - 9 - 80.00 - 3.00 - 6.67 - 101.33 -
>> >> >>> > - 10 - 70.00 - 1.00 - 6.67 - 92.39 -
>> >> >>> > - 11 - 60.00 - 2.00 - 6.67 - 78.04 -
>> >> >>> > - 12 - 50.00 - 2.00 - 13.33 - 70.31 -
>> >> >>> > - 13 - 40.00 - 3.00 - 13.33 - 61.52 -
>> >> >>> > - 14 - 30.00 - 4.00 - 13.33 - 51.56 -
>> >> >>> > - 15 - 20.00 - 5.00 - 26.67 - 40.14 -
>> >> >>> > - 16 - 10.00 - 9.00 - 26.67 - 30.29 -
>> >> >>> > ---------------------------------------------
>> >> >>> > - total time surface = 39.67 min
>> >> >>> >
>> >> >>> >
>> >> >>> > dive number = 1 altitude = 0.00 ft
>> >> >>> >
>> >> >>> > RGBM Trimix Version
>> >> >>> > B.R. Wienke/Los Alamos National Laboratory
>> >> >>>
>> >> >>> > --dive profile--
>> >> >>> >
>> >> >>> > surface breathed nitrogen = 0.79
>> >> >>> > manuever 1 depth = 0.00 fsw time = 0.00 min
>> >> >>> > manuever 2 depth = 220.00 fsw time = 3.67 min
>> >> >>> > manuever 3 depth = 220.00 fsw time = 20.00 min
>> >> >>> >
>> >> >>> > trimix = 0.50 helium 0.34 nitrogen switches = 2
>> >> >>> > switch 1 depth = 70.00 fsw helium = 0.50 nitrogen = 0.00
>> >> >>> > switch 2 depth = 20.00 fsw helium = 0.00 nitrogen = 0.00
>> >> >>> >
>> >> >>> - excursion to depth = 220.00 fsw -
>> >> >>> >
>> >> >>> > - time at inital depth = 20.00 min -
>> >> >>> > --------------------------------------------
>> >> >>> > - stop - depth - wait - tissue - tension
>> >> >>> > - 1 - 160.00 - 0.00 - 1.67 - 172.60 -
>> >> >>> > - 2 - 150.00 - 0.00 - 1.67 - 170.42 -
>> >> >>> > - 3 - 140.00 - 1.00 - 1.67 - 154.86 -
>> >> >>> > - 4 - 130.00 - 1.00 - 3.33 - 144.95 -
>> >> >>> > - 5 - 120.00 - 1.00 - 3.33 - 137.43 -
>> >> >>> > - 6 - 110.00 - 1.00 - 3.33 - 130.02 -
>> >> >>> > - 7 - 100.00 - 2.00 - 3.33 - 117.43 -
>> >> >>> > - 8 - 90.00 - 2.00 - 6.67 - 108.94 -
>> >> >>> > - 9 - 80.00 - 3.00 - 6.67 - 99.57 -
>> >> >>> > - 10 - 70.00 - 2.00 - 6.67 - 90.79 -
>> >> >>> > - 11 - 60.00 - 3.00 - 6.67 - 78.78 -
>> >> >>> > - 12 - 50.00 - 4.00 - 13.33 - 70.40 -
>> >> >>> > - 13 - 40.00 - 5.00 - 13.33 - 61.19 -
>> >> >>> > - 14 - 30.00 - 6.00 - 13.33 - 51.02 -
>> >> >>> > - 15 - 20.00 - 7.00 - 26.67 - 39.37 -
>> >> >>> > - 16 - 10.00 - 8.00 - 40.00 - 29.70 -
>> >> >>> > --------------------------------------------
>> >> >>> > - total time surface = 49.67 min
>> >> >>> >
>> >> >>> > total dives processed = 2
>> >> >>> >
>> >> >>>
>> >> >>>
>> >> >
>> >> >
>> >> >
>> >>
>> >>
>> >
>>
>> --
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