Recreational planning with Subsurface?

[Robert Helling]

Willem,

> On 25. Jan 2018, at 10:48, Willem Ferguson <willemferguson at zoology.up.ac.za> wrote:
> 
>> Hi Willem,
>> In the example you provide, the air NDL at 30m is 13min with gf 35/75. This looks about right to me. From memory the Buhlmann NDL (gf 100/100) is ~17min, and the PADI and navy tables are 2-3 minutes longer. Reducing the gf to 35/75 would reduce the NDL.
> 
> I suspect this is not the complete explanation. The NAUI, NOAA and US Navy tables all give the NDL with air at 30m between 22 and 25 min. With gf=100/100, Subsurface gives 16 min. In addition, the profile does not get close to the ceiling at NDL. I suspect that, with initial cyl pressure not specified, the whole calculation just does not work. Forcing the bottom time to 26 min (gf=100/100) brings the ceiling close to the profile which is more or less acceptable. So that part of the planner works. But if the bottom time is specified as much shorter than 26 min, the NDL also is much shorter. There is a problem or bug there.


how to you get the 16min from Subsurface? Because I seem to get 23min with GF 100/100:




Best
Robert

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                      Scientific Coordinator
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
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