Quote: (Originally Posted by
PCDiver)
Hi Stuart,
great article.
My comments:
Bailout via open loop as prefered method.
I doubt that open loop breathing, which has higher WOB than a BOV or normal regulator, can be used in case of a CO2 hit. In case of a CO2 hit you will initially overbreath even the best regulator. Any extra WOB is not wanted and will increase the problem. For me a BOV is the preferred solution.
That was an example from my scenarios - as I do not have a BOV then Open Loop for me is the method I would use to hopefully get my respiration under control before going for my bailout reg with a CO2 hit and being forced into taking a mouthful of water. Those scenarios are specific to me and my unit and I know that individuals will vary.
Quote: (Originally Posted by
PCDiver)
eCCR as a parachute only (flying it manually)
Flying an eCCR manualy has a higher task load than mCCR. Manualy operating the eCCR certainly needs to be practiced as a skill in case something happens to the solenoid, but as SOP?
You don't have the continous flow that you get with a mCCR. Therefore, there wil bel more deviations from the setpoint, since more manual interventions are required. So, if you are diving without integrated deco computer, how valid will your deco profile be?
I bought rebreathers for deep filming. In my case, manual operation is almost impossible. I have only two hands and both of those are on my camera. But even without camera, I run my Vision on automatic (except during long deco stops). It allows me to enjoy my dive more.
Peter
Electronics go wrong - in my research I did not find a single fatality where someone was flying the unit manually. I do realeaise it is an individual choice though.
I do find though that it does not increase my task loading and becomes very instinctive and I have never had more than a minute or twos deviation between my plumbed in deco and my offboard deco. If you are worried though set your electronics to maintain 1.2 and your off board deco to calculate on 1.2 and if you fly at 1.3 you gain a slight deco advantage.
Quote: (Originally Posted by
AD_ward9)
Your article is excellent! Especially, highlighting do not head for the surface if you have a problem. Bail out first.
This is such a good synopsis, I must ask, do you have any objection to companies incorporating it verbatim in their manuals? E.g. declaring it as being under GNU type copyright release.
Alex
Not at all Alex - thanks for your feedback.