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Thread: Newbie question: Counterlung volume

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    RBW Member t0by is an unknown quantity at this point t0by's Avatar
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    Newbie question: Counterlung volume

    Hello, I'd like to understand a little more about the relationship between counterlung volume and lung volume. (I'm not a rebreather diver yet)

    Many years ago I took part in a study of lung volume / SAC rate. Turned out my max lung volume is about 7.2 litres.

    I'm looking at the JJ spec sheet. The counterlung volume is 8 litres.

    Does this mean that if I inhale the maximum volume of my lungs (7.2 litres), will I almost empty the counterlung? Or is there something else going on - e.g. there'll be 7.2 litres in my lung and a few more litres to keep the counterlungs from collapsing.

    Excuse the ignorance. Trying to figure out if my enormous lung volume will impact the type of rebreather that I choose.

    Thanks in advance

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    RBW Member jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold is a jewel in the rough jlovold's Avatar
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    rEvo III Micro FT

    Pelagian DCCCR

    Re: Newbie question: Counterlung volume

    Just try to figure out what your normal comfortable maximum breathing-volume is.

    I would assume it is about 5-5.5 litres.

    Don`t look yourself blind on the numbers.

    A normal set of counterlungs should be more than enough for you.

    The only CCR I know where you may top and bottom out is the rEvo 3 Micro FT, (4,5l), although that volume fit me almost like a glove. (I had my lung-volume measured to 7.9l, with 6.7l exhaled in one second)

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