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Thread: Difference between breathing hoses

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    Difference between breathing hoses

    With all these WOB discussions i would like to know how big difference you could get with hoses with a smooth inner (cooper etc) compared to corrugated hoses (like most manufacturers use)?
    And what would be optimal I.D?

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    Re: Difference between breathing hoses

    Quote Originally Posted by heigo  View Original Post
    With all these WOB discussions i would like to know how big difference you could get with hoses with a smooth inner (cooper etc) compared to corrugated hoses (like most manufacturers use)?
    And what would be optimal I.D?
    I'm not being scientific here, but my feeling is that a smooth inner compared to corrugated hoses will make little or no difference to WOB. I think the major issues there are major constrictions, and counterlung positioning. I have noticed no difference between diving Cooper hoses on my Mk 15.5 compared to standard hoses.

    I think that a 1.25" ID is pretty ideal. I don't think you get much added benefit from a larger ID, especially if there are any constrictions smaller than that in the unit.

    Aloha,
    Charlie
    Last edited by chunter; 13th February 2008 at 19:53.

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    Re: Difference between breathing hoses

    Quote Originally Posted by chunter  View Original Post
    I'm not being scientific here, but my feeling is that a smooth inner compared to corrugated hoses will make little or no difference to WOB. I think the major issues there are major constrictions, and counterlung positioning. I have noticed no difference between diving Cooper hoses on my Mk 15.5 compared to standard hoses.

    I think that a 1.25" ID is pretty ideal. I don't think you get much added benefit from a larger ID, especially if there are any constrictions smaller than that in the unit.

    Aloha,
    Charlie
    just to give an idee: the 2.4 WOB we got in the highly modified rEvo, was with: drager ray hoses!!! (the ones we currently have on the rEvo's)

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    Re: Difference between breathing hoses

    Hoses have additional trade-offs that have to be considered in answering your question. You can make them bigger inside, but too big becomes a minus. You also start to get problems with stiffness and comfort with certain configurations. Length of the breathing loop come into play, too.

    It's not a one size fits all kind of answer. The hoses, canister and other components of the loop determine what will be the best fit.

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    Re: Difference between breathing hoses

    Quote Originally Posted by chunter  View Original Post
    I have noticed no difference between diving Cooper hoses on my Mk 15.5 compared to standard hoses.

    Agreed. Cooper, Draeger Ray, and Dreager Dolphin hoses on a Mark-15 all breathe the same to me. Coopers are easier to dry out, but that's about it. Ray hoses still dive best... flexable and comfy. Love 'em.

    Dave

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