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Thread: BMCL's

  1. #11
    Down to no good kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter has a reputation beyond repute kwinter's Avatar
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    JJ, Flex

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    Re: BMCL's

    No they don't, Mark. But the cordura outer cover is box shaped and sewn, so I don't think they will collapse. I have plenty of spiral anti-crush tubing left from the Flex if necessary.

    My JJ lungs don't have spiral tubing either, and they don't have the benefit of a box shape. Yet they have never shown a problem either. Is there anti-crush in the SG wings?


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    Ken

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  2. #12
    Hammerhead CCR diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike has a reputation beyond repute diverklondike's Avatar
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    HammerHead CCR

    Sidekick & Others

    Re: BMCL's

    Ken,

    Yes there are with the SG BMCL's... I have always gone back and forth when it comes to using them. About half the time it's not an issue but then I end up heads down on a decent etc that I end up cussing at myself for not having them in and I go back to them. That's not just with the SG ones but with all of the BMCL's that I have been diving.

    Will be interested in what you think of them.

    Dive Safe!!

    Mark

    Quote Originally Posted by kwinter  View Original Post
    No they don't, Mark. But the cordura outer cover is box shaped and sewn, so I don't think they will collapse. I have plenty of spiral anti-crush tubing left from the Flex if necessary.

    My JJ lungs don't have spiral tubing either, and they don't have the benefit of a box shape. Yet they have never shown a problem either. Is there anti-crush in the SG wings?


    iPhone. iTypo. iApologize.

  3. #13
    RBW Member bearkiter is an unknown quantity at this point bearkiter's Avatar
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    Prism2

    Re: BMCL's

    I have been diving the BMCL's for a couple of months and have mixed feelings about them.

    Pro's:
    I'm ridiculously foot heavy, so moving the bags lower down behind my shoulders helps my trim.
    Clean chest, easier to work my camera, easier to hook on sidemount rings and such.
    MAV blocks and offboard ports are easily accessible.
    Less jaw fatigue (longer loop hoses)
    Lungs don't get crushed in restrictions.

    Con's:
    Harder to drain spit/water into bags.
    Harder to flush, very much harder to flush in a restriction.
    Much larger volume, and cannot crush effectively during a flush
    OPV hard to reach in heavy thermal gear
    No instructions (none I've found) ANYWHERE on setup or adjustment
    Cannot put SMB's in side pouches, the lungs get crushed between them and the wing when wing is inflated.
    Offboard gas supply is too slow to supply a Golem BOV - investigating where the restriction is occurring, suspect the one way valves/LPI connection.
    They get a bit noisy when head down, sucking the gas down from the other end of the lung sounds a bit wheezy. Will have a hunt for some spirals.

    Overall I'd only dive them in open environments, this is obviously highly subjective, your opinions may vary, and I'd certainly like to hear if anyone has a solution for any of my issues.

  4. #14
    RBW Member moteman is an unknown quantity at this point moteman's Avatar
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    Optima

    Re: BMCL's

    I realize it's been almost 2 yrs since the last post on this thread.....have you since then added anti collapse spirals to your BMCLs? If so, did they help? I have a couple of questions about your set-up: How high on the frame do you have the BMCLs mounted? Are the t-pieces in front of or on top of your shoulders? Have you learned any tricks or tips to get the best performance from the BMCLs? Any special adjustments to your ADV?

  5. #15
    RBW Member moteman is an unknown quantity at this point moteman's Avatar
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    Optima

    Re: BMCL's

    Does anyone with experience diving the older style Optima BMCLs have any info, tips or advice on set up, or issues and solutions with the Optima BMCLs that might be helpful?

  6. #16
    RBW Member whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot? will become famous soon enough whynot?'s Avatar
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    MK15.5, MK25

    Re: BMCL's

    I'm finding this thread and others here on back mounted counterlungs interesting. I dive units with a back, over the shoulder, and chest mounted lung(s) and each has it's advantage and disadvantage. With respect to units that have been designed with lungs other than back mounted, I wonder whut a diver's real reason for making a back mounted lung modification really is? It can't be WOB, as stated by many who have replied to this thread saying as such. As I have stated in other posts, manufactures have done extensive testing and come up with the units they have for a reason. Sometimes these reasons don't seem apparent on the "surface" but once you dig "deeper" into the reasons you understand that may not be as straightforward as shifting a bunch of cordura around your body. Homebrew modifications have cost divers their lives, undercurrent etc are filled with stories of this.



    Take the PRISM Topaz for example. Based on the MK series with respect to electronics protocol, scrubber duration, and displays, the Readeys came up with a unit which has gone through many evolutions and ended up with a solid design which uses over the shoulder lungs. Why? Many reasons, too many to explain here. But the three most important from my perspective are WOB with regard to diver profile in the water, MAV and ADV in EASY reach of the diver and the ability to manually dump water from BOTH lungs while underwater. None of which is accomplished with a back mounted lung.


    So I say tread lightly my friends and become ultra-familiar with the rebreather design YOU dive and know why it is the way it is before jumping on the bandwagon of the latest and seemingly greatest new mod someone is trying to sell you for your rig. Dive safe and error on the side of conservative so that you may live another day to dive, not die.

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