Cam; i have 2 sets of double 45s, and they make a very slick rec setup. 
the biggest advantages are weight (about the same as a 100cf single), use
of your standard doubles reg setup, and mainly, significantly reduced
profile (especially when compared to a plate, single tank adapter &
cylinder).  plus, you can easily pump them up to 110-120cf.

there are some serious disadvantages however, mainly the manifold as you
mentioned.  at best, it's no better than an H valve (no air redundancy,
just reg); at worst, it's an OMS manifold with all those inherent problems.
 you could solve those problems w/ the custom bands, and an old dive buddy
of mine did exactly that.  but either way, the overall width of the system
is less than that of normal 7-8" diameter doubles, so Halcyon wings become
really large on the system.  my solution there was to use the 45# Pioneer
wing rather than an Explorer.  the tanks restrict some of the smaller
wing's inflation, but there's still plenty left over for lightweights like
that.

obviously, it's a recreational setup only, but the extremely low profile
and the balance of the doubles makes it really comfortable in the water,
and still easy to maneuver on a crowded six-pack.  the only difference
between this and my cave rig is Explorer wings and bigger tanks (with the
right manifold).

---
Glenn Goettler                                           Liquid Earth
geg@li*.co*                        http://www.liquidearth.com



----------
> From: Cam Banks <cam@ca*.co*>
> To: Techdiver Mailing List <techdiver@aquanaut.com>
> Subject: Dual OMS 45's
> Date: Wednesday, April 05, 2000 7:42 AM
> 
> I saw someone with a set of double OMS LP 45's on a diveboat last year,
and
> I have to admit I think this could be my ultimate setup for recreational
> diving.  Mini-doubles, in other words, for air redundancy.  90cf if you
> don't over pressurize the tanks at all, and light enough to take on any
rec
> dive or casual boat dive.
> 
> I already dive an H-valve with two regs when I dive single-tank, but this
is
> just not quite filling my paranoia needs.  Yeah, I know my buddy is my
> redundant air supply, but sometimes you don't get the ideal buddy.
> 
> The problems I saw with the dual 45's set up were bungie-wing (let's not
go
> there; I'm thinking to use a normal Halcyon wing and plate), and no
isolator
> on the manifold.  The reason there was no isolator was because the bands
> held the 45's too close together to fit a standard isolator in between.
> 
> So, what if I had a special set of bands made up to hold the tanks far
> enough apart that I could fit a standard isolator manifold on there.  Is
> this just lameness and I should give up the whole idea, or is there
nothing
> wrong with it?  Thanks.
> 
> Cam
> 
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> Cameron Banks                                  408-821-6314 cell
> Applied Materials Account Manager    408-934-0500 office
>                                                            408-934-0707
fax
>                                                            603-754-3638
efax
> Aera Corporation
> 422 S. Hillview Drive                 e-mail: cam@ae*.co*
> Milpitas, CA 95035                    http://www.massflow.com
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> 
> 
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