Quote:
| Originally Posted by JohnD Gas availability is a problem for the dive this weekend, so I have to use what I have. I like to keep to an END of 40metres or PPN2 of 3.95, but this is what I have in my twin 12s (using the "rule of 1/3s). I personally would not use a 3litre for anything but a pony, not enough gas available using "rule of 1/2s" for deco for your buddy if he loses his. I will be using 7.5litre sideslungs, more gas available.
GARF, I cant work out the simulation mode on the dive manager software using multiple mixes, but I can do it using the Vytec itself as it changes to the next gas (at its max PO2 set) as you ascend. |
The Gas Rules all look ok to me, Not that I stick to them , but I do like to have
plan A B and C
Plan A
Waypoint at 43m for 25:00 (26) on Air, PPO2 1.107, END 43
Deep Stop at 27m for 2:00 (29) on Air, PPO2 0.773, END 27
Deep Stop at 21m for 2:00 (32) on Air, PPO2 0.648, END 21
Deep Stop at 15m for 2:00 (35) on Air, PPO2 0.523, END 15
Norm Stop at 9m for 1:00 (36) on Air, PPO2 0.398, END 9
Norm Stop at 6m for 5:00 (41) on 100% Oxygen, PPO2 1.596, END 0
Norm Stop at 3m for 10:00 (50) on 100% Oxygen, PPO2 1.298, END 0
TOTAL DECO TIME: 22 minutes.
DIVE RUN TIME: 50 minutes.
CNS Total: 25.6%
2655.0 Ltr. of 21.0% consumed. Twin 12L
241.7 Ltr. of 100.0% consumed. 3L cylinder
.
Bailout plan B
Waypoint at 43m for 25:00 (26) on Air, PPO2 1.107, END 43
Deep Stop at 27m for 2:00 (29) on Air, PPO2 0.773, END 27
Deep Stop at 21m for 2:00 (32) on Air, PPO2 0.648, END 21
Deep Stop at 15m for 2:00 (35) on Air, PPO2 0.523, END 15
Norm Stop at 9m for 1:00 (36) on Air, PPO2 0.398, END 9
Norm Stop at 6m for 10:00 (46) on Air, PPO2 0.335, END 6
Norm Stop at 3m for 26:00 (72) on Air, PPO2 0.273, END 3
Or buddy s o2 at 50mins Plan C
TOTAL DECO TIME: 43 minutes.
DIVE RUN TIME: 71 minutes.
CNS Total: 12.0%
3247.8 Ltr. of 21.0% consumed. Twin 12L
A Pony may only be a pony to you , But to me its 600L or 695L of gas and in the case above it’s more than twice the quantity of gas that I need ,
Plan A
Waypoint at 43m for 25:00 (26) on Nitrox 26.0, PPO2 1.370, END 40
Deep Stop at 27m for 2:00 (29) on Nitrox 26.0, PPO2 0.957, END 25
Deep Stop at 21m for 2:00 (32) on Nitrox 26.0, PPO2 0.802, END 19
Deep Stop at 15m for 2:00 (35) on Nitrox 26.0, PPO2 0.647, END 13
Norm Stop at 6m for 3:00 (38) on 100% Oxygen, PPO2 1.596, END 0
Norm Stop at 3m for 9:00 (47) on 100% Oxygen, PPO2 1.298, END 0
TOTAL DECO TIME: 18 minutes.
DIVE RUN TIME: 47 minutes.
CNS Total: 27.6%
2644.7 Ltr. of 26.0% consumed. Twin 12L
190.3 Ltr. of 100.0% consumed. 3L cylinder
Bail out plan B
Or buddy s o2 at 47mins plan C
Waypoint at 43m for 25:00 (26) on Nitrox 26.0, PPO2 1.370, END 40
Deep Stop at 27m for 2:00 (29) on Nitrox 26.0, PPO2 0.957, END 25
Deep Stop at 21m for 2:00 (32) on Nitrox 26.0, PPO2 0.802, END 19
Deep Stop at 15m for 2:00 (35) on Nitrox 26.0, PPO2 0.647, END 13
Norm Stop at 6m for 5:00 (41) on Nitrox 26.0, PPO2 0.415, END 5
Norm Stop at 3m for 20:00 (60) on Nitrox 26.0, PPO2 0.337, END 2
TOTAL DECO TIME: 31 minutes.
DIVE RUN TIME: 60 minutes.
3046.8 Ltr. of 26.0% consumed. Twin 12L
2843Ltr if you go on buddy s o2
and a run time of round 53 mins
The dive on the gas you have ie 21% and 65%
the 36% I just can’t find a purpose for it, on this dive ,
you could drop it to 100 bar and top off with air get a nice 3rd bottom gas
run a longer bottom time ie 35 mins and still stay in within your gas rules
Dive
Waypoint at 43m for 25:00 (26) on Air, PPO2 1.107, END 43
Deep Stop at 27m for 2:00 (29) on Air, PPO2 0.773, END 27
Deep Stop at 18m for 2:00 (32) on Air, PPO2 0.585, END 18
Waypoint at 15m for 2:00 (35) on Nitrox 65.0, PPO2 1.618, END 1
Deep Stop at 12m for 2:00 (37) on Nitrox 65.0, PPO2 1.425, END 0
Norm Stop at 6m for 2:00 (40) on Nitrox 65.0, PPO2 1.037, END 0
Norm Stop at 3m for 13:00 (53) on Nitrox 65.0, PPO2 0.844, END 0
TOTAL DECO TIME: 21 minutes.
DIVE RUN TIME: 53 minutes. Vytec over run +5 =58mins Vr3 ran at 55mins
2524.5 Ltr. of 21.0% consumed. Twin 12L
428.4 Ltr. of 65.0% consumed. 7 L cylinder
.
Bail out
Or buddy s 65% at 53nins
Waypoint at 43m for 25:00 (26) on Air, PPO2 1.107, END 43
Deep Stop at 27m for 2:00 (29) on Air, PPO2 0.773, END 27
Deep Stop at 21m for 2:00 (32) on Air, PPO2 0.648, END 21
Deep Stop at 15m for 2:00 (35) on Air, PPO2 0.523, END 15
Norm Stop at 9m for 1:00 (36) on Air, PPO2 0.398, END 9
Norm Stop at 6m for 10:00 (46) on Air, PPO2 0.335, END 6
Norm Stop at 3m for 26:00 (72) on Air, PPO2 0.273, END 3
TOTAL DECO TIME: 43 minutes.
DIVE RUN TIME: 71 minutes. Vytec over run + 9 = 80mins Vr3 ran at 75mins
3247.8 Ltr. of 21.0% consumed. Twin 12L
less if you get your buddy s 65%
The Vytec / VR3 over run, You would pull That Back as you deco on the fly
Vr3 deep stop 28m 0% Conservatism Zplan deep stop 27m on 10% Conservatism
DDplan 24m Deco planner 24m both on GFlo20% GFhi80%
So take your pick ,
I Think all the above meet your gas rules ,
bottom Rmv 16 deco Rmv 12 , My Rmv
Don’t know if you’ slurp or gulp the gas , so run your numbers ,
Hope this is of some help Have fun and enjoy your dive ,
,
Ps
Next time you see a pony don’t think it’s a donkey , it’s only a donkey when it’s full of 50% nitrox or less Ha I am in for it now,
Steve G,
Most days full sh:t as you can see .