cmalinowski
Contributor
You really can't have "contingency" deco gas because you only have one regulator (one person breathing at a time). So, you use Limeyx's lost gas plan.How much contingency gas do you have with 30mins of deco on that 40? (I'm too tired to work it out myself right now)
As for other gas plan:
Gas Plan (170 for 30)
Max Depth 170ft / 51.5m (6.2ATA)
Bottom Time 30 min
SAC Rate 0.6
Time from surface to Depth (170ft) @60ft/min 3 min
Gas needed to travel to Depth 6cf
Gas needed for bottom time 112cf
First Stop 130ft / 39.4m (4.9ATA)
Time from 170ft to the First Deep Stop (130ft) @30ft/min 2 min
Gas needed to get from depth to first deep stop 12cf
Time to Solve an Emergency at Depth 2 min
Gas needed for Emergency 13cf
Average ATA traveling from depth to first deep stop 5.6
Average ATA for deep stops and gas switch 4
Time to Complete Deep Stops and do Gas Switch 7 min
Gas needed for deep stops and gas switch 28cf
Minimum Gas Reserve (MGR) 106cf
Total back gas needed 224cf
Back gas used if all goes perfectly 158cf
Deco Time on 50% 40 min
Deco SAC Rate 0.5
Average ATA of Deco based on profile below 2.2
Total Deco gas (50%) needed 44cf
Total run time of dive 82 min
vs 150 for 30
Max Depth 150ft / 45.5m (5.5ATA)
Bottom Time 30 min
SAC Rate 0.6
Time from surface to Depth (150ft) @60ft/min 3 min
Gas needed to travel to Depth 5cf
Gas needed for bottom time 99cf
First Stop 110ft / 33.3m (4.3ATA)
Time from 150ft to the First Deep Stop (110ft) @30ft/min 2 min
Gas needed to get from depth to first deep stop 10cf
Time to Solve an Emergency at Depth 2 min
Gas needed for Emergency 11cf
Average ATA traveling from depth to first deep stop 4.9
Average ATA for deep stops and gas switch 3.7
Time to Complete Deep Stops and do Gas Switch 5 min
Gas needed for deep stops and gas switch 19cf
Minimum Gas Reserve (MGR) 80cf
Total back gas needed 184cf
Back gas used if all goes perfectly 133cf
Deco Time on 50% 30 min
Deco SAC Rate 0.5
Average ATA of Deco based on profile below 2.2
Total Deco gas (50%) needed 33cf
Total run time of dive 70 min