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David Giddy wrote:
>There are now a number of programs available which allow dive planning and
>simulation based on Haldanean models such as Buhlmann's.
>
>Does anyone know of any software available or under development which is
>based on the more recent models such as Hills' thermodynamic model or Wienke's
>Reduced Bubble Gradient model ?
I don't know of any currently available, but I too would be interested
in seeing them for myself, if they exist. I am currently "designing" a
dive computer/desktop deco computer algorithm for "fun." I have
been toying with using Buhlmann's algorithms (because they're well
documented), DCIEM if I could get my hands on a math representation,
or the RBG model described in Bruce's book. I haven't really made up
my mind, since I'm only really in the analysis stage of my program. I'm
working up ideas for a good design too, but with my studies.....
BTW, I'm trying to make this program using "standard" software
engineering techniques so that it has a better possibility of being a
well made program when it's all done with. Unfortunately, the deeper
I get into this, the more I find that I don't know. ;-)
>
>I have recently been reading "Basic decompression theory and applications" by
>Bruce Wienke which goes into quite some detail on these models at a theoretical
>level. I would be very interested to play with some software which implemented
>the model to see just how different the decompression staging is (the models
>which incorporate free-phase considerations seem to require much
>deeper first stops to encourage the dissolution of evolved free phase gas).
>
>I personally find the theory behind these models compelling and Wienke
indicates
>that the limited testing that has been done seems to support the models well.
>
>Anyone know anything about current thinking on these models (Wienke's book was
>published in 1991) ?
>
I thought it was a good book. I'm trying to make time to read it again to
get more
insight to the RGB model. I think these "new" theories are VERY interesting,
but I don't believe limited testing can even come close to "proving" and
algorithm correct. I know people who have been bent and not bent doing
dives of [pracically] identical profiles on different days that were well
within
the limits established in several very popular tables. (DCIEM, US Navy,
BSAC 89, etc.). An ex-girlfriend was bent on a dive that was borderline for
DCIEM, but "safe" on all the others. Unfortunately for her, it was a type
II, and
she can never dive again. She also found out from the experience that she has
Myocardial (?) Valve Prolapse, which the doctors say is probably what helped
cause her hit. BTW, this was how we met. I guess it pays to be the local
"expert" about different deco theories _GRIN_ .
>I believe that there is a Scubapro dive computer either available or soon to be
>available based on these models (Wienke is a consultant to Scubapro) - anyone
>know anything about this ?
>
I seem to remember something about this too. I think it's the DC-11, but don't
quote me on that.
Carl W. Meilahn
NAUI Instr. # 14470
NSS/CDS Full Cave Diver
IANTD EANx # 7460, EANx Cave Diver # 152
cmeilahn@cc*.cc*.ut*.ed*
cmeilahn@cs*.ut*.ed*
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