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Rick,
We have had the best results, i.e. feeling better after the dive, fewer
bubbles by Doppler score, etc., by going to the highest He and thereby
lowest O2 that could be safely breathed at that depth. Allows for a
greater drop in the PO2 which will build (if you will) a bigger cushion
between you and developing problems.
George uses two longer periods (I believe approx 10-20 mins) of back
gas breaks before the 70' switch and again before coming out of the
habitat. 50/50 is breath from the last stop, 20 ft, to the surface.
The argument for moving away from the He towards the N can be traced
back several years to higher EAD mixes and decoing on air from mix. You
are still doing decompression and I would wager that the small amount of
gas breathed during the breaks is not enough to create new problems. If
this were not the case, then the wisest course of action would be to NOT
count the breaks towards you deco time as is, and has been, done, w/o problem.
Moving one gas back will still serve the purpose of lowering you PO2,
but it will not do the best job of it. The important thing to mention here
is the fact that you are doing the breaks.
Back gas breaks is a topic that will be explained in further detail in
the near future. Until that time I hope I have at least pointed you in the
right direction, or answered your question.
Sincerely,
Scott Hunsucker
At 11:13 AM 04/11/2000 -0500, Gatto, Richard RG SCC wrote:
>How about some advice here... O2 breaks.... Do you use your back gas or your
>previous gas?
>Example: Lets say you have back gas 17/55, deco 50/50 and O2.
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