DeepTechScuba,
Thanks for your comments. Your P/1.6 rule remains incorrect
as I detailed in my earlier post. Be careful if you employ it
within Haldane based deco software, as you may miss deeper
stops required by dual phase mechanics. Try some dual phase
software like GAP and ABYSS. Times are also very important
at deep stops, and arbitrary rules like "P/1.6" and "gradient
factors" miss the timing boat crucially. And with high risk.
No surprise since arbitrary times attend any arbitary deep stop
rule.
You are also wrong in stating that "both of our Agencies"
use a P/1.6 rule. Check the NAUI Tech tables for any mixture,
and any depth. What I stated in my earlier post IS amplified
therein. It's NOT ambient pressure divided by 1.6 to the
first deep stop in those Tables. Nor is it in dual phase deco
software you can find in the marketplace (GAP and ABYSS).
NAUI Tech/Rec tables are based on a full up, dual phase model
(RGBM), correlated with data in the field, and fitted to same.
Arbitrary rules do not enter anywhere here.
Nor in the sat regime if deep stops are juxtaposed safely.
Nor in very deep exposures of any length. Nor in the
field tested WKPP protocols. Nor here at LANL. Nor in
in some world record dual phase profiles employed by
cutting edge, extreme divers.
Using Haldane based software with deep stops imposed
by any prescription is NOT self-consistent. Nor are "gradient
factors" that are used to increase Haldane M, G, and
R-values. The problem is that you CANNOT mock up dissolved
gas staging algorithms to do bubble mechanics consistently
for all exposures and mixes. Same holds for the P/1.6 approach.
The "theories" you mention are not mine -- they are
college physics and chemistry 101. And have been known
since the late 1800s. They have been late coming on the real
diving scene because of medical inertia and requisite numerical
sophistication. Deep stops require dual phase dynamics plus
a computer to be done CORRECTLY across the board.
Regards,
Bruce Wienke
Program Manager Computational Physics
C & C Dive Teal Leader
