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Richard,
Due to the linearity of the Buhlmann model, if you make the last stop deeper,
it tends to get longer and longer. I think Buhlmann's model is being stressed
to its limit here. Also, the poor use of gases (air!) plays a major part. Some
accelerated deco using EanX 50 and oxygen would be nice here.
Notice that the rest of the shallow stops get shorter. I wonder what would
happen if you added to the deep stops? But one thing I would certainly do is
make that 6m stop on oxygen.
Here is what I would do:
Zplan v1.03
(c) Copyright 1997-98, William M. Smithers
DIVE PLAN
Waypoint at 50m for 20:00 (25) on Trimix 21.0/30.0, PPO2 1.253, END 35
Deep Stop at 30m for 1:00 (28) on Trimix 21.0/30.0, PPO2 0.836, END 21
Deep Stop at 21m for 1:00 (30) on Trimix 21.0/30.0, PPO2 0.648, END 15
Deep Stop at 15m for 1:00 (32) on Trimix 21.0/30.0, PPO2 0.523, END 11
Norm Stop at 9m for 2:00 (36) on Trimix 21.0/30.0, PPO2 0.398, END 6
Norm Stop at 6m for 13:00 (51) on 100% Oxygen, PPO2 1.596, END 6
TOTAL DECO TIME: 18 minutes.
DIVE RUN TIME: 50 minutes.
CNS Total: 36.9%
OTU's: 61
If you MUST do this dive on air, it would look like this:
Zplan v1.03
(c) Copyright 1997-98, William M. Smithers
DIVE PLAN
Waypoint at 50m for 20:00 (25) on Air, PPO2 1.253, END 50
Deep Stop at 30m for 1:00 (28) on Air, PPO2 0.836, END 30
Deep Stop at 21m for 1:00 (30) on Air, PPO2 0.648, END 21
Deep Stop at 15m for 1:00 (32) on Air, PPO2 0.523, END 15
Norm Stop at 9m for 2:00 (36) on Air, PPO2 0.398, END 9
Norm Stop at 6m for 13:00 (50) on 100% Oxygen, PPO2 1.596, END 6
TOTAL DECO TIME: 18 minutes.
DIVE RUN TIME: 49 minutes.
CNS Total: 35.8%
OTU's: 60
Which looks exactly the same deco-wise, but check out the difference in END
(oxygen IS narcotic in my book)
rgrds
Adri KC Haine
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