Quote: (Originally Posted by
Joe Hesketh)
Graham
Nice report. Can I ask how did you find PiO2 drops in practice? Are the measured results anywhere near the theory where I suppose you are guessing at ventilatory equivalents for O2 and volume ratios, etc? Is the Datech software just an implementation of a standard PASCR steady state equation, or was there more to it?
Joe
Joe
Upto around 15% at the surface by 21m its reduced to 2-3%. I now use a PO2 monitor for new profiles but otherwise pretty happy and just deco out as if I am on Open circuit - with the caveat that I either use 50% and 100 (18 and 21% type dives where you might use one deco gas on OC) or 100 only (30m stuff) for deco to minimize the shallow water drop and I ramp up the Helium (21/55 anybody
in the drive bottle because its cheap and I buy into Helium is your friend (feel better for it)
No idea on the software - if its safe (ie not hypoxic and not hyperoxic) I am not too worried about the PO2 so haven't invested too much in studying the equations and software - just know that it works when I verify what the software says should happen with what my PO2 is on dives.
YMMV and I certainly don't recommend you follow my lead
Graham