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Drew,
If the conventional wisdom is correct in suggesting that one do the
deepest dives of a series first then it is also suggesting that you take on
the greatest N2 loading first. But then there is the matter of time also.
If the second dive is considerably longer but only 10% shallower on Ean 36
what have you then? In reality this is too complex a physiological
situation to reduce to a the presently available mathmatical models and
expect it to represent anything as close to reality as all of us would like.
I think I would follow the conventional wisdom and do the physiologicaly
deeper dive first (greatest N2 exposure) on air simply because it has been
shown to work by experience. Then, when on EANx for the second dive you can
extend your safety or deco stop and take advantage of the elevated O2
available at the end of the days exposures. You will probably have lots of
surplus gas at the end of the second dive.
My thinking is that you actually have two air dives here (phisiologically)
and this procedure leaves you with decompression and safety margin options
that you can take advantage of during the last dive; especially useful in the
event that things did not go as planned on either the first or second dive.
I am assuming that this is a 'recreational limits' dive.
Chuck
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