I did some related stuff using a wing of a collar style wing a a CL for a pendulum.
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Connecting the breathing hose to the lower dump:
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Or via the top dump:
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Anyway its important the wing is not too large so that it can float away like the wings on a bat.
Did som thinking about turning it into a dual hose Rebreather-with the cannister either on the side of the backplate or behind the head. Never got time to follow up on that.