Rgbm

[tombiowami]

What is the main difference in RGBM and the other deco models? I have looked around but have not seen anything that just kind of spelled it out. Just point me to the link here or otherwise if there is one. Something like a history of deco for dummies to get started?

Is there a book about the subject that makes it easier to understand? I have checked out a couple but they started way over my head and seemed to get more complex from there.

Is there a published set of RGBM tables? I saw some of the info on the new Naui tables, are these strict RGBM? If there is such a thing?

Are these different (beyond different flow of figuring out SITs and all) than the older Naui tables in terms of time underwater/SIT?

Do the Suunto computers use the exact RGBM tables, if there are some, or a modified alogrithim?

Tommy

 

[TexasMike]

Dr. Bruce Weinke (now on this board) is one of the developers of the RGBM. He is also a well published author and several of his books should be required reading for the type of diving you and I are planning to get to. I have one of his books recommended by my instructor, but unfortunately, the title escapes me. I'll have to check and get back to ya.

 

[Dr Deco]

Dear Readers:

I do not know of all of the specifics of the commercial aspects of the tables and meters (NAUI, VYPER, etc) and thus cannot comment on products.

With regard to the RGBM itself, it is what is referred to as a two-phase model. This means that the idea of tissue micronuclei is built into it ab initio , or "from the beginning."

SOME of the nuclei can grow, and become decompression bubbles, depending on the degree of supersaturation and the rate of ascent. The nuclei are countered from growing by virtue of the inward-directed Laplace pressure generated by the surface tension. Only microbubbles with a certain radii greater that the “Laplace cutoff” can grow, and the RGBM attempts to see that this salutary condition exists – and persists.

In some cases, it is also possible to adjust the gradient (for inert gas elimination) in order to secure a more conservative decompression profile.

This model is of more value to deep diving (technical diving) than it is for the average recreational diver who does not go deeper than about 120 fsw.


Dr Deco :doctor:

 

[TwoBitTxn]

Basic Diving Physics and Applications.
Best publishing Co Copyright 1994

TwoBit

 

[BRW]

All,

This is just a quicky reply to many RGBM questions. Hope I touch most bases:

1) -- New NAUI RGBM Tables are no-calc, no-group, no fuss
Tables with minimal SIs of 1 hour, and minimal decrements
on successive dives (3 max per day) for recreational
diving. Decrements max from 45 fsw for a first dive
to 120 fsw for NDL, and all third dives end in the 30 fsw
zone. Tables are for air, EAN32 and EAN36 from sea
level to 10,000 ft elevation. Time to fly varies from
12 hr after 1 dive to 18 hrs after 3 dives. There are
nine separate Tables. Yes, they are published, and
can be obtained from NAUI Worldwide, Tampa, Florida;

2) -- A 600 page set of tech diving tables (deep with deco)
for trimix, nitrox, heliox, helitrox, air will be released
also by NAUI Tech Training. I will be releasing an even
larger set thru Best Publishing;

3) -- Suunto, Plexus, Hydrospace, Mares and Dacor all have
RGBM in their meters and/or will be releasing new ones.
Meters span recreational to technical diving;

4) -- ABYSS is a software product on NET with RGBM and I
and Tim O'Leary will be releasing our own version
shortly (JAVA scripted);

5) -- ALL TABLE, METER, AND SOFTWARE versions are
SAME RGBM -- but the recreational version simplifies
in some equations making it shorter and easier to
implement in meters and software. Dual phase
calculations (both dissolved and bubble gases) underscore
all implementations. BIG differences between RGBM and
the old (classical) applications to diving show up with:

a) -- increasing depth beyond 90 fsw

b) -- increasing time beyond NDLs

c) -- increasing number of repets

d) -- increments on reverse profiles

f) -- increasing days of diving

g) -- use of helium rich or nitrogen rich breathing mixtures

h) -- use of oxygen in the shallow zone for deco

i) -- increasing diving altitude

j) -- in short, as you go from recreational air diving
above 90 fsw at sea level to ALL OTHER diving
(extended range, deco, mixed gas, high altitude.
reverse profile, repets beyond 2 a day, 3 days
of diving, etc)

6) -- deep stops occur naturally in all RGBM implementations;

7) -- all Table, meter, software implementations are backed
by "non-anecdotal" data from NAUI Tec Ops, LANL,
WKPP, and others.

I posted an article, called Technical RGBM, to Mike's site
detailing a bunch of the above.

Bruce Wienke

Program Manager Computational Physics
C & C Dive Team Ldr

 

[Scuba]

Bruce Wienke wrote:

BIG differences between RGBM and the old (classical) applications to diving show up with: a) thrue J).

Does RGBM reduce or extend the parameters compared to the old tables?

Will you please provide us with the link to the article.

Peter

 

[Scuba]

Found the link myself on the other RGBM thread.

http://www.abysmal.com/pages/articles/abys1.pdf

Article on subject:

http://www.doctordeco.com/