dive plans for testing

Sat Jul 4 17:28:23 PDT 2015

Dirk,

On 5 July 2015 at 00:30, Dirk Hohndel <dirk at hohndel.org> wrote:

> Could someone with access to different dive planning software please run a
> few test plans for me?
>
> Let's do the profile that Rick quoted from the VPM documentation:
>
> three gases: 15/45, 36%, 100%
> descent rate to bottom of 75ft/min down to 260ft (weird... 208 seconds to
> the bottom...)
> 30 minutes bottom time (we can't do that it seems, drop down to bottom is
> included in the first segment... so let's say 33 minutes until end of
> bottom time)
> ascent rate 30ft/min
> 10ft/min from the final stop (actually, Subsurface can't do that, so
> 10ft/min from 20ft which will add a tiny 40 seconds from 20ft to 10ft)
>
> can you post the full plan for GF100/100, GF35/70, and VPM-B ?
>
>
Note that the example you gave used 38% rather 36% as the first deco gas.
Also, by saying the VPM "benchmark" profile had a bottom time of 30
minutes, I meant the ascent started at 30 minutes runtime.  Definitions of
bottom time vary - sorry for not clarifying before.  I also didn't mention
that the benchmark took final stop depth as 20 ft.

Using these parameters, and my recent patches to make the planner more
friendly to using feet, the Subsurface planner now produces:

Subsurface dive plan
based on GFlow = 100 and GFhigh = 100

  depth

duration

runtime

gas

260ft

3min

3min

(15/45)

260ft

27min

30min

110ft

7min

37min

EAN36

80ft

4min

40min

70ft

2min

42min

60ft

5min

47min

50ft

5min

52min

40ft

8min

60min

30ft

13min

73min

20ft

35min

108min

oxygen

0ft

2min

110min

CNS: 111%
OTU: 165

Subsurface dive plan
based on GFlow = 35 and GFhigh = 70

  depth

duration

runtime

gas

260ft

3min

3min

(15/45)

260ft

27min

30min

140ft

6min

36min

130ft

3min

39min

120ft

3min

42min

110ft

1min

43min

EAN36

100ft

3min

46min

90ft

2min

48min

80ft

4min

52min

70ft

4min

56min

60ft

6min

62min

50ft

9min

71min

40ft

13min

84min

30ft

19min

103min

20ft

54min

157min

oxygen

0ft

2min

159min

CNS: 164%
OTU: 235

And finally, with Jan's VPM patchset (and my adjustment to configuration
parameters), without Boyles law adjustment:

Subsurface dive plan

  depth

duration

runtime

gas

260ft

3min

3min

(15/45)

260ft

27min

30min

170ft

4min

34min

160ft

1min

35min

150ft

2min

37min

140ft

2min

39min

130ft

2min

41min

120ft

3min

44min

110ft

1min

45min

EAN36

100ft

2min

47min

90ft

2min

49min

80ft

2min

51min

70ft

3min

54min

60ft

4min

58min

50ft

5min

63min

40ft

7min

70min

30ft

8min

78min

20ft

20min

98min

oxygen

0ft

2min

100min

CNS: 81%
OTU: 142

This is incredibly similar to the VPM benchmark runtimes.  At worst it
differs at each stop by 1 minute. Note that the benchmark has a 20 s stop
at 180ft, we continue to 170 ft, but both plans reach 170ft at exactly 33:18

I'm not a serious tech diver (even though I'm TriMix certified - I just
> never do it). If anything in this sample is stupid (or if we should test
> different parameters), please modify accordingly.
>

I'm still a learner tech diver (halfway through TDI Adv Nitrox and Deco
Procedures), so definitely not a serious trimix diver.

> oddly, 4.4.2.955 gives me not only different formatting (that was an
> intentional change) and still the wrong line for the oxygen change, but
> also slightly inconsistent run times (all parameters were set identical);
> check out the run time at 79ft  or the total run time...
>

I think that will be due to my earlier patch (commit
e5a4b5a61838d7c3f95856ce11c21fe7aa992eb4), to end deco stops on whole
minutes of runtime.  It is possible but less likely that adjusting the
timestep (48aa0bdfd0450b6a51b4f2aa18f65b91b8b361b0) to 2 seconds, might
have had some effect.

Cheers,

Rick
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.subsurface-divelog.org/pipermail/subsurface/attachments/20150705/be5a1b10/attachment-0001.html>