[PATCH]Re: Deco calculation for repetitive dive - strange effect

[Klaus Künsemüller]

Hi All,

@Rick: Your guess is right: Oberflächenpause is surface interval.
In V-Planner I already tested several variant of surface interval: Above 
3h surface time the result stays the same, including your request of 
single dive calculation.

My  first impression: It looks like V-planner doing the expected result, 
just the algebraic sign (+/-) is inverted.

When I compare  in V-Planner this diving profile: VPM-B vs. VPM-B/E, the 
effect for both is the same, just quite small different in the sum. 
VPM-B/E gives a little bit les “bonus”.

-- 
Grüße Klaus Künsemüller

Ob den Weingärten 2
71735 Eberdingen

015253425252



Am 09.02.2017 um 23:00 schrieb Rick Walsh:
>
>
> On 10 February 2017 at 07:50, Stefan Fuchs <sfuchs at gmx.de 
> <mailto:sfuchs at gmx.de>> wrote:
>
>
>
>     3. Then for the second, much simpler dive I am surprised that the
>     results are different! I planned this very simple dive then
>     "standalone" in both tools -> still the same difference. VPlanner
>     gives you shorter deco and I really have doubts if I did s.th
>     <http://s.th>. wrong but I can't figure out what.
>
>     Subsurface Tauchplan
>     Runtime: 55min
>
>     	
>
>     Tiefe
>
>     	
>
>     Dauer
>
>     	
>
>     Laufzeit
>
>     	
>
>     Gas
>
>     ➘
>
>     	
>
>     40m
>
>     	
>
>     4min
>
>     	
>
>     4min
>
>     	
>
>     Luft
>
>     ➙
>
>     	
>
>     40m
>
>     	
>
>     16min
>
>     	
>
>     20min
>
>     	
>
>     -
>
>     	
>
>     15m
>
>     	
>
>     6min
>
>     	
>
>     26min
>
>     	
>
>     -
>
>     	
>
>     12m
>
>     	
>
>     3min
>
>     	
>
>     29min
>
>     	
>
>     -
>
>     	
>
>     9m
>
>     	
>
>     4min
>
>     	
>
>     33min
>
>     	
>
>     -
>
>     	
>
>     6m
>
>     	
>
>     7min
>
>     	
>
>     40min
>
>     	
>
>     -
>
>     	
>
>     3m
>
>     	
>
>     12min
>
>     	
>
>     52min
>
>     	
>
>     ➚
>
>     	
>
>     0m
>
>     	
>
>     3min
>
>     	
>
>     55min
>
>     	
>
>
>     CND: 9%
>     OTU: 24
>
>     Deco model: VPM-B at +2 conservatism, effektive GF=27/66
>     ATM pressure: 1013mbar (0m)
>
>     	V-Planner 3,98 by Ross Hemingway,
>     VPM Code by Erik C. Baker.
>
>     Dekompressionsmodell:  VPM - B
>
>     TAUCHPLAN
>     Oberflächenpause = 5 Tag(e) 0 hr 0 min.
>     Höhe über N. N. = 0m
>     Konservatismus = + 2
>
>     Abst.    40m        (4)    Air    10m/min Abstieg
>     Tiefe    40m     16:00    (20)    Air    1,02 ppO2,  40m ead
>     Aufst.    18m        (22)    Air    -10m/min Aufstieg
>     Stop    18m      0:48    (23)    Air    0,58 ppO2,  18m ead
>     Stop    15m      2:00    (25)    Air    0,51 ppO2,  15m ead
>     Stop    12m      3:00    (28)    Air    0,45 ppO2,  12m ead
>     Stop    9m      3:00    (31)    Air    0,39 ppO2,  9m ead
>     Stop    6m      7:00    (38)    Air    0,33 ppO2,  6m ead
>     Stop    3m     10:00    (48)    Air    0,27 ppO2,  3m ead
>     Oberfl.            (51)    Air    -1m/min Aufstieg
>
>     Ausgasung beginnt bei  27,4m
>
>     OTU's Tauchgang: 21
>     CNS Total: 7,4%
>
>
> I'm no German speaker, but I guess Oberflächenpause is surface 
> interval.  Can you try planning this dive again with V-Planner, but do 
> it as a new 'mission', rather than a 5 day surface interval?  In 
> Subsurface, we ignore any previous dives >2 days earlier, but 
> V-Planner may not, and it may be taking credit for the crushing 
> pressure of the previous dive.
>
>
>     Finally I decided not to worry too much :-)
>     - I prefer to see a penalty for any repetitive dive I plan so I
>     like the fix you did now
>     - Subsurface at least in this examples gives similar or slightly
>     more conservative results -> also ok for me
>     - My buddies and me will continue to compare different results
>     before we go diving
>     - I don't do repetitive dives so often because actually I'm too
>     lazy to get in and out of my dry suit more than once a day + plus
>     I'm so hungry and thirsty after each dive that this also stops me
>     from doing a second one afterwards ;-)
>
>
>     Best regards
>     Stefan
>
>     -- 
>
>     Stefan Fuchs
>     E-Mail: sfuchs at gmx.de <mailto:sfuchs at gmx.de>
>
>

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