Kevrumbo
Banned
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Resurrecting this again, and to clarify in light of a recent TDS thread:
RD works as applied, "similar to a Buhlmann profile set to a conservative factor of 30/85 and/or a V-planner profile (RGBM/VPM-B) set to a conservative factor of +2", with profile shaping using S-Curves or linear progression for the intermediate deco stops, and 12min:6min or 10min:5min/Oxygen:backgas break intervals. You can adjust the shape and/or add more time to the stops as needed per your own physiology and trial & error in "how much better or worse you feel" post-dive.
Going to divulge the big secret now: Four years ago, Andrew Georgitsis alluded to me in private that Ratio Deco --as outlined above and in the pdf attachment below-- also works with deep air as well.
But publicly, Andrew Georgitsis will never endorse diving Ratio Deco on air backgas during his class, or under the auspices of UTD --obviously because of the extreme narcosis, safety issues and potential personal, professional & company liability (see my bends hit incident for an example of the detrimental effects of nitrogen narcosis). This does not imply that the algorithm doesn't work with deep air or any other non-standard bottom gas when correctly calculated.
IMO/IME, you can use what bottom gases you've got with the Ratio Deco method, along with the caveat to be prepared in mitigating task risks during the dive due to narcosis (i.g. no overhead penetrations, complex missions etc.), if you don't utilize the necessary standard bottom helium mixes. . .
RD works as applied, "similar to a Buhlmann profile set to a conservative factor of 30/85 and/or a V-planner profile (RGBM/VPM-B) set to a conservative factor of +2", with profile shaping using S-Curves or linear progression for the intermediate deco stops, and 12min:6min or 10min:5min/Oxygen:backgas break intervals. You can adjust the shape and/or add more time to the stops as needed per your own physiology and trial & error in "how much better or worse you feel" post-dive.
Going to divulge the big secret now: Four years ago, Andrew Georgitsis alluded to me in private that Ratio Deco --as outlined above and in the pdf attachment below-- also works with deep air as well.
But publicly, Andrew Georgitsis will never endorse diving Ratio Deco on air backgas during his class, or under the auspices of UTD --obviously because of the extreme narcosis, safety issues and potential personal, professional & company liability (see my bends hit incident for an example of the detrimental effects of nitrogen narcosis). This does not imply that the algorithm doesn't work with deep air or any other non-standard bottom gas when correctly calculated.
IMO/IME, you can use what bottom gases you've got with the Ratio Deco method, along with the caveat to be prepared in mitigating task risks during the dive due to narcosis (i.g. no overhead penetrations, complex missions etc.), if you don't utilize the necessary standard bottom helium mixes. . .