On 08/01/2017 12:27, Robert Helling wrote:
Hi,
On 07 Jan 2017, at 22:43, Rick Walsh <[email protected]> wrote:
I'm interested in hearing Robert's feedback on your suggestion, but
would be happy to implement it when I get a chance (and that's been
far too rarely lately) after 4.6 is out.
my concerns are pretty much the same: The planner already has almost
too many parameters to configure. Not concentrating on the essentials
has a real price in usability.
So adding two more parameters (problem solving time and emergency SAC
or whatever you might call those) needs to be justified by the
benefit. I am not going to add those for everybody just to please a
single user. But if one can make the case that it benefits most users
(in the sense of they care about the resulting information) then we
should have those. I have done some googling on „Rock bottom gas“ and
almost everybody has their own idea how to exactly calculate that. But
indeed, the two parameter model fits many. So it might be something
for 4.7. But I would love to have some more user input.
Best
Robert
The rock-bottom approach is sensible in a recreational environment
because it provides an explicit framework to think seriously about gas
planning which few recreational divers do. I am not sure which training
agency(s) uses this concept. In a technical/cave environment, most
training agencies have their own ways of teaching explicit gas planning,
with most using rule of thirds or rule of quarters. As indicated in the
previous discussion, the situation becomes very complex when using deco
gases and one wishes to use the rock-bottom concept (as well as
additional planning for regulator failure of a deco cylinder) and the
example calculation for a 60m dive in previous correspondence shows that
this approach soon becomes unproductive within the technical diving
context. I have been involved as a donor in two recreational OOG events
and, fortunately, the gas consumption did not skyrocket. So rock-bottom
pressure level is interesting to me, but I myself use the proven rules
of the training agency where I got certified.
Kind regards,
willem
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