4.5.4 - last call

[Willem Ferguson]

On 18/03/2016 02:00, Miika Turkia wrote:
>
> Well, it seems I get one minute longer dive if I dive within few minutes from a previous dive to 38 meters. And planning for 20 minutes at 40 meters. Sounds unbelievable short penalty from accummulated nitrogen, but indeed it looks like previous dives are taken into account, to some extent.
>
> miika
> ___________
Here are plans from VPlanner for similar dives.

Using EAN28: 2 dives to 40m for 20 min

Dive 1:

   Depth Stop Run Mix pO2 EADDes 40 -  2     28 -     - Lvl 40 18 20 28 
1.36  35 Asc 15 - 22 28 - - Stp 15 0:13  23    28     0.67  12 Stp 12    
2:00  25    28     0.58   9 Stp 9     4:00  29    28     0.50   6 Stp 
6     5:00  34    28     0.42   4 Stp 3     10    44    28     0.33   1 
Sfc -     -     44    28     -      -

Dive# 1,  VPM-B  +3
Elevation = 975 m
CNS = 13%
OTU's = 33
Gas  28 = 2887 ltr.

Surface interval: 20 min

Dive 2:

     Depth Stop Run   Mix     pO2   EADDes 40     -    2     28     
-     - Lvl 40     18   20    28    1.36   35 Asc 18     -    22    
28     -     - Stp 18   0:33   23    28    0.75   14 Stp 15   2:00   
25    28    0.67   12 Stp 12   3:00   28    28    0.58    9 Stp 9    
4:00   32    28    0.50    6 Stp 6    9:00   41    28    0.42    4 Stp 
3    23     64    28    0.33    1 Sfc -     -     64    28     -      -

Dive# 2,  VPM-B  +3
Elevation = 975 m
Surface interval 0d  0h 20m
CNS = 25%
OTU's = 34
Gas  28 = 3342 ltr.
Decozone start = 24 m

Using Subsurface *4.5.2.1083:*

Dive 1:

Subsurface dive plan based on VPM-B at +4 conservatism

depth

	

duration

	

runtime

	

gas

40m

	

2min

	

2min

	

EAN28

40m

	

18min

	

20min

	

15m

	

3min

	

23min

	

15m

	

1min

	

24min

	

12m

	

1min

	

25min

	

12m

	

2min

	

26min

	

9m

	

1min

	

27min

	

9m

	

3min

	

29min

	

6m

	

1min

	

30min

	

6m

	

6min

	

35min

	

3m

	

1min

	

36min

	

3m

	

10min

	

45min

	

0m

	

1min

	

46min

	

CNS: 15% OTU: 41

Gas consumption: 2942ℓ/123bar of EAN28 (748ℓ/31bar in planned ascent)


20 min surface interval

Dive2:

Subsurface dive plan based on VPM-B at +4 conservatism

depth

	

duration

	

runtime

	

gas

40m

	

2min

	

2min

	

EAN28

40m

	

18min

	

20min

	

15m

	

3min

	

23min

	

15m

	

1min

	

24min

	

12m

	

1min

	

25min

	

12m

	

3min

	

27min

	

9m

	

1min

	

28min

	

9m

	

4min

	

31min

	

6m

	

1min

	

32min

	

6m

	

8min

	

39min

	

3m

	

1min

	

40min

	

3m

	

20min

	

59min

	

0m

	

1min

	

60min

	

CNS: 15% OTU: 41

Gas consumption:

3266ℓ/136bar of EAN28 (1072ℓ/45bar in planned ascent)


Hope the formatting of above holds on your email system.
Reasonably similar??
Kind regards,
wf



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