Started doing the Multi - Filter component for dives.

[Anton Lundin]

On 26 September, 2014 - Gaetan Bisson wrote:

> [2014-09-26 14:38:24 +0200] Anton Lundin:
> > Before dd1dc11cb60ec819d26ae198633546db780dec18 we showed the setpoint
> > column in the diveplanner, and if you had a setpoint there ment you
> > where on CCR with that gas as diluent. If the setpoint became zero that
> > ment bailout to OC.
> 
> Do we need to know the diluent type to compute the deco? I'm only
> trained for air so I hadn't thought of that...
> 

Yes, you need to know what you diluted your oxygen with to do any sort
of deco calculations. If its Air we need to know that to do some sane
deco calculations, and if it where 10/50 your deco profile will be a
bit different.

> > That ment you needed to plan two different dives, one CCR-all-the-way
> > and one as your bailout plan.
> > 
> > We would need some nifty way to both do ccr-planning and bailout
> > planning in the same "plan", and some way of figuring out worst point to
> > plan bailout from
> 
> A worst point does not necessarily exist: early in the dive,
> compartments with short half times will be the bottleneck, so a bailout
> plan would give short but deep stops; later in the dive it will be
> compartments with longer half times, and you will have longer but
> shallower stops. So it seems that computing a deco schedule onto which
> the diver can bail out at any point during the dive is not trivial.
> 

There is a wost point, where it would consume the most bailout gas to
get the diver to the surface. Thats the point you need to plan your
worst case scenario bailout from to size your bailout capacity.

> Ideally we should give a deco schedule for bailing out at the end of
> each planned dive segments. So if you have a multilevel dive with three
> segments, you'd have four schedules: the normal one on CCR and three
> bailout plans.
> 
> I think for the moment it'd be good enough to just have a switchbox that
> says "compute deco on CCR" and if unchecked on OC.

This suggestion is actually worse than the previous setting a SP on a
segment for CCR and setting it to zero for bailout.

How would one calculate a bailout plan with your "compute deco on CCR"
checkbox?

How would one switch diluent during a dive?


I would rather suggest adding a way to choose the sort of dive you are
planning, OC by default, CCR and PSCR (maybe), and if CCR be able to set
a SP during that leg of the dive, or choose a point during the dive to
plan a bailout from.


> > I haven't looked around that hard, but i haven't seen any other planning
> > software which does a good job of planning bailout of ccr dives. If
> > anyone knows one we can have a look at please post here.
> 
> Most people I know use V-Planner.

I must have done something bad to my v-planner install because it
refuses to compute anything for me right now. On the other hand, there
ui looks like a car crash and is the strangest thing I've know, so there
is probably no point in looking at it for anything but examples on what
not to do.


//Anton

-- 
Anton Lundin	+46702-161604