Dirk, On 5 July 2015 at 00:30, Dirk Hohndel <[email protected]> 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
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