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Old 13th February 2008, 18:50   #1
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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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Old 13th February 2008, 19:50   #2
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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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Old 13th February 2008, 20:09   #3
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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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Old 14th February 2008, 06:02   #4
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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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Old 14th February 2008, 13:20   #5
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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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