[quote=caveseeker7]Matt, wasn't the dual Cis dual for backup?
So you're familiar with the idea of a dual rebreather.
You dive the Meg. You dive the Oh-tooptima.
Throw out the big 4 ltr jugs, mount the Meg onto the Oh Tooptima and off you go.
Two supply tanks for the DiveRite can be sidemounted ... give it a try and let us know.
Yep
I loved the Dual Cis. we did gas depots up to 8000 feet or so but then went to double Cis for bail out. Great stuff, never felt better deep underground. We could have walked out if we wanted to.
Steve Bogaerts was diving a double Inspiration mounted on a steel frame in the Pit exploration with bottom time exeeding 1 hour to a depth exeeding 330 feet - 100 meters.
Olivier Isler did his record breaking dives years back on 3 breathers, and I think that's the way to go, in terms of redundancy.
Meg - Optima ( diving the Optima with 2 ltr steel's ) combo sounds good. O2 on the side, maybe two for redundancy, larger sidemount tanks for dilluent or in case you need to drop it all and do a little no-mount excursion ... just kidding.
Counterlung cluster is becoming an issue. On the double Cis we had the two sets of counterlungs in front, after some time one is getting used to it. I think Steve Bogaerts told me he had one set of counterlungs in front of his shoulder and one set behind his shoulder. I can see that too, should not be to difficult to pull them out and use them if needed.
A word of caution if you like your tounge. When diving the double Cis in the beginning during trials I had a hard lesson to learn. When descending with the twins you need to inflate the second unit or it may create a vacuum. One day I did a switch and had not sufficiently inflated the second unit, the moment I opened the DSV my tounge was sucked into the mouth piece. Very painfull. Only with great force and inflating the unit I could retrieve my tounge, while not being able to breathe ... its blocked by my tongue right. If I would have been in a uncontrolled descent I would probably have drowned. I damaged one of the Cis corrugated hosees as well during this vacuum trial. Ouch ...
What we did as well was diving the backup unit on the way down, make sure its working allright, has the right po2, computers working, right gases selected in the deco software and so on. The primary unit was inflated with diluent. When getting to max depth doing the switch we then verified the primary unit was working properly with po2, gases plugged in, gases set in the deco software and then went on for the dive. That left us to know the backup unit is ready to roll when needed.
Matt
www.protecdiving.com