> I imagine a switchover going like this: you grab the OC reg on the
> necklace and start breathing that immediately.  Then you deploy
> one of the bag rebreathers and start to inflate it, dumping gas
> from your wings at the same time.  When you've got about the 
> right volume in the bag counterlung, you drop the OC and switch
> to the bailout RB.  Not too bad, on the task-loading front.


Will, question:  are the bailout RB's connected to some sort of automatic
pressure compensation device so that internal pressure is kept at ambient?
If not, wouldn't you worry about 'sorb compression (and possible
channeling complications therefrom) as the bag collapsed around it?  If
you do have a pressure compensating system, does the bag have an OP relief
valve to dump the excess gas on ascent without expanding displacement?
Finally, if the SC bailout RB has sensors (or does it?), why not plumb a
quick-disconnect with manual valve to your MK 15.5 O2 supply so that even
the simple bailout RB can be run fully-closed? The way I see it, with
clever plumbing, you really need only four cylinders total: two Dil and
two O2 (for redundancy of O2, and for momentary OC supply of Dil). One of
each is already inside your MK 15.5, so you'd onle need two external
cylinders. The idea is to allow for cross-over redundancy: all RB's can
access all gas supplies. Then problem, of course, is the need to be very
clever about the plumbing to: 1) minimize extraneous failure points; and
2) minimize probability of a diver cluster.

Aloha,
Rich

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