[PATCH] MOD of oxygen at pO2 of 1.6 is 20ft
rickmwalsh at gmail.com
Sun Jul 5 14:03:09 PDT 2015
On 6 Jul 2015 4:26 am, "Robert C. Helling" <helling at atdotde.de> wrote:
>> On 05 Jul 2015, at 15:09, Dirk Hohndel <dirk at hohndel.org> wrote:
>> But what I've seen in diver training and in blender training (I'm a
certified trimix diver and trimix blender) is that you round to the nearest
foot. Not truncate.
Here people do that, but they also have the big semi-permanent label
indicating MOD down the side. That is the depth they switch at, which is
always a normal deco stop depth (multiple of 3m /10ft). 21 m (not 22 m)
for 50%, etc. And the switch depth in feet is always 0.3 x the switch
depth in metres.
Serious question: does anyone switch to 50% at 22m?
For the planner, we need the switch depth, not the true MOD. Maybe we need
to rename the function to something like gas_switch_depth. Or we can
create a new function if the current one is used elsewhere.
> I guess that is the best solution: Round to the nearest meter/foot
depending on units. Will later send a patch for this.
To calculate switch depth, I'd be tempted to round to nearest metre. Then
round down to nearest 5m. And finally, do a psuedo conversation of 1ft
=0.3m to get the imperial gas switch depth.
I have work to go to, so won't be sending a patch in the next 12 hr.
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