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Chip - you have 99% of it. Eliminate the step
of separating the diaphram from the reg!!!
What I'll be doing is simply mounting my regulators
into the cabin bulkhead. The regs' diaphrams push in on descent, air comes
into the cabin. On ascent, the air expands against the regulators and the
air flows out the mouthpieces of the regs and gets dumped
overboard.
Voila. Self compensating.
Some regs have adjustment knobs (ScubaPro comes to
mind) that allow you to control how much breathing effort is needed to get
air. Why? If you're working u/w, you'll be breathing hard and you
DON'T want that air flooding into you. If you're very still taking photos,
you need the air to flow into you easily.
Cranking up all the knobbies on the regs (I'll be
using about 5 or 6 regs) would make it harder for air to enter the
cockpit. Cabin pressure would always lag behind the surrounding water
pressure - not really a good idea. Any leaks in the cockpit walls would produce
a stream of water. Making it easy for the air to come into the cabin (or
breath into), especially if the regs are mounted down low where it's slightly
deeper than the top of the cabin, would ensure a slight overpressure.
Leaks should show up as a stream of bubbles outside the cabin.
Rick L
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