On Mon, 21 Dec 1998, Ken Sallot wrote:

> Of course, Will Smithers, I'm sure, is a much more accomplished cave 
> diver then most of the subscribers to this list (well as soon as he 
> completes a full cave course that is).

Hey guys: I don't subscribe to cavers, I'm sorry for accidentally
replying to a cross-post over there - I won't do it 
again after this - I usually just cut cavers out of the reply
field.  But thanks for the insult, Ken, it's good to know that
cavers still holds true to it's Neandrethal reputation.

BTW, geez, somebody needs to go in and do some list maintenance - I
got about 20 bounced messages when I sent that reply to cavers.

Thanks,

-Will







 
> Ken
> 
> > Date:          Mon, 21 Dec 1998 09:50:49 -1000 (HST)
> > From:          Richard Pyle <deepreef@bi*.or*>
> > To:            "William M. Smithers" <will@tr*.co*>
> > Cc:            H2Ocaver <ezimmerm@ch*.ca*.us*.ed*>, rebreather@nw*.co*,
> >                cavers <cavers@cavers.com>
> > Subject:       Re: Cave diving RB setup.
> 
> > > 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
> > 
> > 
> "Say, is that your Captain Marvel secret decoder lunchbox you got
> hanging back there?" - Anon E. Mouse
> 
> 

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