Difference between breathing hoses

P3 · 13th February 2008, 17:50

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?

**chunter** · 13th February 2008, 18:50

Quote: (Originally Posted by heigo)

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

paulraymaekers · 13th February 2008, 19:09

Quote: (Originally Posted by chunter)

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)

paul

***ScubaDadMiami*** · 14th February 2008, 05:02

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.

MB · 14th February 2008, 12:20

Quote: (Originally Posted by chunter)

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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13th February 2008, 17:50	#1 (permalink)
P3 Petri Keskitalo Join Date: Jun 2005 Location: Sweden Posts: 277	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? __________________ P3
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13th February 2008, 18:50	#2 (permalink)
chunter I like diving Mk15.5, Mk15 Inpisspiration, KISS Join Date: Jul 2006 Location: Honolulu Posts: 814	Re: Difference between breathing hoses Quote: (Originally Posted by heigo) 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 __________________ "Foolish consistency is the hobgoblin of little minds." - Emerson "Hobgoblin is a cool word." - Charlie Last edited by chunter; 13th February 2008 at 18:53..
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13th February 2008, 19:09	#3 (permalink)
paulraymaekers rEvo's daddy rEvo Join Date: May 2005 Location: belgium Posts: 3,637	Re: Difference between breathing hoses Quote: (Originally Posted by chunter) 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) paul __________________ www.rEvo-rebreathers.com ...."Yes you have to pre-breathe to activate the scrubber sorb, anyone who says different doesn't know what they are talking about!"... .... to get more accurate CO2 injection in the breathing machine we put 2 mass flow controllers in series ... .... radial scrubbers give longer dwell time than axials... .... the earth is flat and ...
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14th February 2008, 05:02	#4 (permalink)
*ScubaDadMiami* Moderator Join Date: Sep 2005 Location: Florida, USA Posts: 2,790	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. __________________ Howard Packer IANTD CCR Instructor Miami Beach, Florida CCRDiveTraining.com
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14th February 2008, 12:20	#5 (permalink)
MB Banned Join Date: Jun 2006 Posts: 0	Re: Difference between breathing hoses Quote: (Originally Posted by chunter) 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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