Planner: Bailout dive planning

[Willem Ferguson]

On 2019/01/15 10:26, Robert Helling wrote:
>
> thank you for this suggestion. Just let me make sure, I understand it properly: The procedure you envision is that in PSCR mode (note that the planner does not do gas switches in CCR mode), the planner performs gas switches based on the depth recorded in the gas tables. But, in some way, each cylinder has a dive mode associated to it and when switching to that cylinder, the dive mode is changed accordingly?
>
> Best
> Robert

At the risk of being longwinded let me give an example. A normoxic SCR 
dive with EAN50 and oxygen as deco gases. Many SCR divers would start 
the dive with EAN50 in OC then switch to closed circuit around 20m depth 
(I personally would start with EAN50 in SCR mode, but GUE for instance 
require starting on OC). HOWEVER this use of OC does not affect the 
decompression algorithm and would need to be entered as OC descending 
dive segment(s) in the dive points table before the bottom phase of the 
dive is reached.

The bottom phase of the dive is performed on the loop.

During ascent, at some stage, it could be advantageous to do a planned 
bailout. Typically this might occur at the switchover from trimix to 
EAN50 at 20m, implying that, from that point on, deco calculations 
should be performed using OC parameters.

So I think your understanding as explained above is correct. BUT I would 
like your recent implementation of activating the check box for a 
bailout ascent NOT to be affected in any way by the rest of our 
discussion, above.

As far as CCR is concerned, change to external OC cylinders can be 
performed using the existing bailout planning facility, so no action is 
probably needed with respect to CCR dives.

Kind regards,

willem





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