caverdave
Contributor
So it was RJP's idea and I have been having fun.
I took a dive to 130 for 40min (28%). the total calculated dive time was 110 minutes.
then i added a stop at 80 for 10 minutes (40%) and a stop at 40 for 10 min (50%) and then one at 30 for 5, and 20 for 5 and got the total dive time down to 82 minutes. but still a 7:40 deco obligation on O2. at one point I had the deco down to :40 and i am still playing with it to minimize both the deco obligation and the total dive time.
It will take me some re-reads to understand what was posted above. I am a little slow that way. I have to see what is behind the formulas I can not just absorb them as is.
The playing helps- keep it up.
If you are questioning why it shows up as deco in this example vs the 1st dive- - you've taken a huge leap in bottom time (40 minutes vs 5).
Pending your tanks that jump up may not even be plausible (mentioning as sometimes playing can lead one into odd scenarios).
For your playing also suggest comparing back to your original tables too; with your above stops you should see a difference between the two.
A very rough generalization that may help for understanding (but not to be read into too much) would be that you are off gasing while ascending and taking on a new average depth when stopping at more shallow depths. Lots of "fun" to be had watching the dive computer go from full red need deco to no deco as one "watches fish" at 30-20' (vast overgeneralization but may help mentally picture...)
If you haven't taken or has been awhile you might get some significant insight from an Adv nitrox deco procedures class...
Dave