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As promised here are some actual numbers!. These are from a test dive that
Bill and I did last Sunday. The breather was, as always, our semiclosed circuit
constant mass flow UBA. It was loaded with ~50% O2 and operating at ~8 lpm.
Bill has the actual records but they are within a few percent of these numbers.
@33 fsw / 2 ATA, PO2 was
rest .96-.98
moderate .93-.91
short maximal burst .78-.80
@61 fsw / 2.85 ATA , PO2 was
rest 1.46-1.48
moderate 1.4
These numbers will be somewhat skewed because our supply regulator is
still depth compensated and hence the flow rate rises slightly with depth
( about 10% per ATA ).
From the above numbers one can easily calculate
@33 fsw / 2 ATA, FO2 was
rest .48-.49
moderate .46-.45
short maximal burst .39-.40
@61 fsw / 2.85 ATA , FO2 was
rest .51-.52
moderate .49
A word about the short burst. I swam a series of 3 wind sprints for about
a minute each. These were maximal efforts unlikely to be repeated in any
"real" dive. I will try a longer duration swimming effort next time we do
some tests.
One interesting point is the VO2 of the maximal effort. I get
VO2 = ~1.6 lpm
This is in contrast to my efforts on land ( running up stairs ) where I
easily managed a VO2 > 2.00 lpm ( single test ).
We will probably repeat these tests or variations there of. However we have
now made 3 such test dives ( Myself 1 and Bill 2 ) and the results have
been consistent.
Barrie
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