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Steve Millard <ec96@li*.ac*.uk*> wrote:-

> ... you are going to carry a spare cylinder or two mounted on the side. ...
> also carry an extra open circuit regulator ...

You can keep on adding extra bits for unusual circumstances making the set
ever more expensive and heavier per hour duration and more unhydrodynamic in
swimming and in rolling over etc. Meanwhile the standard UK naval frogmen's
rebreathers and the old Siebe Gorman Salvus are beautifully light and
streamlined and agile. An incredible amount of work goes into streamlining
boats and submarines both naval and pleasure; how often is diving gear tested
for streamlining and minimum drag?

As regards minimizing weight per duration for a buddy supply, why not a second
CLOSED-circuit mouthpiece?

What shape is the rear (lower) end of the latest Cis-Lunar sets? When I had a
one-day Prism course Peter Readey complained about the Carmellan SMS-2000 that
its square lower end caused an astonishing amount of tail eddying drag in
straight swimming. But the new Japanese Fieno short-duration mixture
rebreather that I have seen pictures of, is in a long blister-shaped backpack
like half a big aqualung cylinder split endways and looks incredibly
streamlined and its centre of mass close to its wearer minimizing
rotation-inertia when the diver rolls over. The ad recommended it for sport
use, but it looks handy for many sorts of short quick work dives also. What
is the size and weight and duration for the various Cis-Lunar models?

And by the talk of a decompression LED on the mouthpiece, it seems that the
bendmeter (= decompression meter) is still built into the set, so on an
expedition forcing each diver to stick to his own set instead of any diver
being able to use any set. Or how is this catered for? In a boat at sea with
all sorts of things to keep track of as well as merely `going for a swim', I
don't want to have to face a lot of complicated computer-room-style uploading
and downloading each diver's blood gas info into and out of breathing sets'
onboard computers; I'd want to keep my own bendmeter and merely connect it to
my current set's ppO2 meter.

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