O2 does not drive the breathing reflex. The amount of dissolved CO2 in your blood does. So an increased pO2 should not noticeably decrease your air consumption.
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Looking at the numbers, something odd happened on the 88 foot and 106 foot dive to drive your SAC up, the values fall well out of +/- one standard deviation from the other numbers to that point (+/- .047), eliminating them as outlayers shows the same trend as I see in my data.Interesting.... I looked at several of my dives at various depths to look for a trend.
DEPTH SAC
106 .51
88 .57
82 .41
63 .48
50 .48
48 .45
40 .50
29 .46
26 .55
15 .50
There did seem to higher rates the shallower I got, and all dives were from the past year, so my physical fitness shouldn't have changed that much.
[B]Metric[/B]: SAC rate is in [I]litre/minute[/I]
SAC = ( tank_volume_in_litre x used_air_in_bar )
/ ( minutes x avg_absolute_pressure_in_bar )
avg_absolute_pressure_in_bar = ( avg_dept_in_meter / 10 ) + 1
[B]Imperial[/B]: SAC rate is in [I]cubic feet/minute[/I]
SAC = cubic_feet_of_air_used
/ ( minutes x avg_absolute_pressure_in_bar )
cubic_feet_of_air_used = tank_size_in_cf x used_air_in_psi
/ tank_rating_in_psi
avg_absolute_pressure_in_bar = ( avg_depth_in_feet / 33 ) + 1
arman68:
Blackwood:...because my mind likes to group things a certain way, I express it as follows:
{Vrated/(Prated*Pambient)} * {(PSIo-PSIf}/T]
The first {} is tank information... how much volume you get from a full tank at a given ambient pressure (which, for SAC purposes, is your average pressure depth).
e.g. HP100 -> 100CF from 3443PSI at 1ATA
The second {} is dive information.
e.g. 3443PSI/60minutes if you empty (hoover) your HP100 in an hour
Together, that's a (S)AC rate of about one-and-two-thirds CFM.
DA Aquamaster:In my opinion you need to work on developing excellent bouyancy skills, learn to move efficiently in the water with no flapping arms or extra leg, trunk or body movement, develop a cleaner and more streamlined gear configuration to reduce the power required to move at a given speed and develop an efficient breathing pattern consisting of breathing deeply and pausing slightly at the top of the inhale to maximize gas exchange.