Possible Bug with Stats and Info

[Willem Ferguson]

The user manual deals explicitly with the logging of sidemount dives.
Kind regards ,  willem

On 08 May 2017 22:02, "Linus Torvalds" <torvalds at linux-foundation.org>
wrote:

> On Mon, May 8, 2017 at 11:47 AM, Ryan McLean <pvtryan100 at gmail.com> wrote:
> > I performed a side-mount dive with 2x10L 232 Bar Steel Cylinders added in
> > the Equipment Page as two separate line items
> >
> > On both tanks:
> > Starting Pressure: 200
> > Final Pressure: 120
> > Dive Time (62m 20Sec)
> > Max Depth 7.2m
> > Avg Depth: 5m
> >
> > Looking at the info Page I see:
> > ********
> > Gases Used
> > Air
> > Air
> >
> > Gas Consumed
> > 720L
>
> Yeah, you don't have a gas switch event, so subsurface thinks the
> second tank is basically unused.
>
> > When I look at the Stats Page I see
> > ********
> > Gas Comsumed:
> > 720L
>
> Same thinghere.
>
> You can add a fake gas switch event on the profile, and you'll get the
> expected numbers, I think.
>
> I do *not* know what the right model for "use two cylinders at the
> same time" is, although the other hack (right now) is to simply
> consider your dual cylinders to be one single one (of twice the size).
> But that only works when the beginning/ending pressures match (like
> they happen to do for you), ie when you can basically consider the
> side mount cylinders to be one single combined manifold.
>
> Although your expected numbers are kind of wrong:
>
> > Gas Consumed
> > 800L
> > 800L
> >
> > SAC
> > 17
> >
> > Gas Comsumed:
> > 1600L
> >
> > SAC
> > 17
>
> Your 800l is wrongly calculated.
>
> You seem to think that one atmosphere is 1 bar. That's not true.
>
> You also don't take the compressibility of air into account.
>
> I suspect the subsurface number of 720.9l per cylinder is actually the
> correct one. You can hover over the equipment fields to see the actual
> conversion to liters at the pressures in question.
>
>                      Linus
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