mk15.5 WOB and scrubber duration test report compared to mk15

Drmike · 7th April 2008, 04:14

Rubicon Research Repository: Item 123456789/3525

some good stuff!

when the mk16 scrubber was fitted to mk15 it gave a 40% increase in scrubber life and reduced WOB

wob for mk15.5 and mk15 (with later mouthpieces) compares very well (surpases) most new units

chunter · 7th April 2008, 06:47

I do notice significantly more WOB on my 15 than I do on my 15.5. I have fitted a MK 16 DSV and hoses to my 15, so the hoses are not the reason. Unless you widen the openings from the center section, it will never breathe like a 15.5 or 16.

The canister duration does not surprise me either as there is significantly more sorb and thermal protection in a 15.5/16 canister than in a 15.

Thanks for the link. There are also some really good articles here if you search for "MK 16":
Public STINET (Scientific and Technical Information Network)

At that link, you can find pricelists, parts lists, and a bunch of studies. Pretty cools stuff.

Aloha,
Charlie

Drmike · 7th April 2008, 07:45

hey at least we know why the USN decide to upgrade their MK16s rather than replace them with better performing units.....

with the exception perhaps of boris - no such unit exists

Drmike · 7th April 2008, 07:47

Quote: (Originally Posted by chunter)

Unless you widen the openings from the center section, it will never breathe like a 15.5 or 16.

comes close just by changing dsv and hoses:-MK15= 2.29J/L compared to 1.97J/L for MK15.5

@45m and 75 RMV

Mk15 w/standard Hoses and scott mouthpiece 5.3J/L
Mk15 w/redar(cooper style) Hoses and scott mouthpiece 4.1J/L
Mk15 w/AGA ACSC mouthpiece and hoses 2.44J/L
MK15 w/rexnord mouthpiece and mk16 hoses 2.29J/L
MK15.5 w/Rexnord mouthpiece and MK16 hoses 1.97J/L\

Im currently rebuilding my MK15.5 with Boris hoses and Boris DSV.....hoping that will beat even 1.97

**Dave Sutton** · 7th April 2008, 19:21

Quote: (Originally Posted by Drmike)

with the exception perhaps of boris - no such unit exists

Bet the CIS Mk-is right up there too. Too few of them around to worry about though, unless you happen to have one....

Dave

.

chunter · 7th April 2008, 20:55

Quote: (Originally Posted by Dave Sutton)

Bet the CIS Mk-is right up there too. Too few of them around to worry about though, unless you happen to have one....

Dave

.

Can you get BMCL's for that thing?

Paul G · 7th April 2008, 23:36

Hi Mike,

Out of interest, how does the 1.97J/L figure (MK15.5 w/Rexnord mouthpiece and MK16 hoses) compare with more modern units such as the Boris, Meg or Inspiration?

I'm using a Boris hoses and Boris DSV on my Mk15.5 and wob seems good, but that's very subjective.

Cheers,
Paul

Drmike · 8th April 2008, 02:40

Quote: (Originally Posted by Paul G)

Hi Mike,

Out of interest, how does the 1.97J/L figure (MK15.5 w/Rexnord mouthpiece and MK16 hoses) compare with more modern units such as the Boris, Meg or Inspiration?

here yah go Paul

Paul G · 8th April 2008, 04:32

Thanks Mike. It's pleasing to know that my unit is at the right end of the graph.

I find it quite incredible that rebreather loop design in general hasn't improved in the 28 years since the Mk16 (Mk15.5 centre section) was designed. In fact it looks like it's gone backwards!

Paul

chunter · 8th April 2008, 16:35

Quote: (Originally Posted by Paul G)

I find it quite incredible that rebreather loop design in general hasn't improved in the 28 years since the Mk16 (Mk15.5 centre section) was designed. In fact it looks like it's gone backwards!

Paul

True, but some would argue the validity of this test. The difference in resistance is so small compared to the resistance resulting from the angle of the unit in the water or the hydrostatic effects on the unit. Anyway, I'm not complaining or anything (except that I still think the SK is a pretty damned good little unit).

Aloha,
Charlie

7th April 2008, 04:14	#1 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,066	mk15.5 WOB and scrubber duration test report compared to mk15 Rubicon Research Repository: Item 123456789/3525 some good stuff! when the mk16 scrubber was fitted to mk15 it gave a 40% increase in scrubber life and reduced WOB wob for mk15.5 and mk15 (with later mouthpieces) compares very well (surpases) most new units __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you Last edited by Drmike : 7th April 2008 at 06:06.
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7th April 2008, 06:47	#2 (permalink)
chunter I like diving Current Rebreather/s: Sport Kiss MK 15.X Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Classic Kiss Join Date: Jul 2006 Location: Honolulu Posts: 452	Re: mk15.5 WOB and scrubber duration test report compared to mk15 I do notice significantly more WOB on my 15 than I do on my 15.5. I have fitted a MK 16 DSV and hoses to my 15, so the hoses are not the reason. Unless you widen the openings from the center section, it will never breathe like a 15.5 or 16. The canister duration does not surprise me either as there is significantly more sorb and thermal protection in a 15.5/16 canister than in a 15. Thanks for the link. There are also some really good articles here if you search for "MK 16": Public STINET (Scientific and Technical Information Network) At that link, you can find pricelists, parts lists, and a bunch of studies. Pretty cools stuff. Aloha, Charlie __________________ "Foolish consistency is the hobgoblin of little minds." - Emerson "Hobgoblin is a cool word." - Charlie
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7th April 2008, 07:45	#3 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,066	Re: mk15.5 WOB and scrubber duration test report compared to mk15 hey at least we know why the USN decide to upgrade their MK16s rather than replace them with better performing units..... with the exception perhaps of boris - no such unit exists __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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7th April 2008, 07:47	#4 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,066	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Quote: (Originally Posted by chunter) Unless you widen the openings from the center section, it will never breathe like a 15.5 or 16. comes close just by changing dsv and hoses:-MK15= 2.29J/L compared to 1.97J/L for MK15.5 @45m and 75 RMV Mk15 w/standard Hoses and scott mouthpiece 5.3J/L Mk15 w/redar(cooper style) Hoses and scott mouthpiece 4.1J/L Mk15 w/AGA ACSC mouthpiece and hoses 2.44J/L MK15 w/rexnord mouthpiece and mk16 hoses 2.29J/L MK15.5 w/Rexnord mouthpiece and MK16 hoses 1.97J/L\ Im currently rebuilding my MK15.5 with Boris hoses and Boris DSV.....hoping that will beat even 1.97 __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you Last edited by Drmike : 7th April 2008 at 07:51.
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7th April 2008, 19:21	#5 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,450	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Quote: (Originally Posted by Drmike) with the exception perhaps of boris - no such unit exists Bet the CIS Mk-is right up there too. Too few of them around to worry about though, unless you happen to have one.... Dave . __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled.
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7th April 2008, 20:55	#6 (permalink)
chunter I like diving Current Rebreather/s: Sport Kiss MK 15.X Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Classic Kiss Join Date: Jul 2006 Location: Honolulu Posts: 452	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Quote: (Originally Posted by Dave Sutton) Bet the CIS Mk-is right up there too. Too few of them around to worry about though, unless you happen to have one.... Dave . Can you get BMCL's for that thing? __________________ "Foolish consistency is the hobgoblin of little minds." - Emerson "Hobgoblin is a cool word." - Charlie
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7th April 2008, 23:36	#7 (permalink)
Paul G New Member Current Rebreather/s: MK 15.X Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Nov 2005 Location: Australia Posts: 27	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Hi Mike, Out of interest, how does the 1.97J/L figure (MK15.5 w/Rexnord mouthpiece and MK16 hoses) compare with more modern units such as the Boris, Meg or Inspiration? I'm using a Boris hoses and Boris DSV on my Mk15.5 and wob seems good, but that's very subjective. Cheers, Paul __________________ www.sydneyproject.com Last edited by Paul G : 8th April 2008 at 01:48. Reason: typo
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8th April 2008, 04:32	#9 (permalink)
Paul G New Member Current Rebreather/s: MK 15.X Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Nov 2005 Location: Australia Posts: 27	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Thanks Mike. It's pleasing to know that my unit is at the right end of the graph. I find it quite incredible that rebreather loop design in general hasn't improved in the 28 years since the Mk16 (Mk15.5 centre section) was designed. In fact it looks like it's gone backwards! Paul __________________ www.sydneyproject.com
(Online)

8th April 2008, 16:35	#10 (permalink)
chunter I like diving Current Rebreather/s: Sport Kiss MK 15.X Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Classic Kiss Join Date: Jul 2006 Location: Honolulu Posts: 452	Re: mk15.5 WOB and scrubber duration test report compared to mk15 Quote: (Originally Posted by Paul G) I find it quite incredible that rebreather loop design in general hasn't improved in the 28 years since the Mk16 (Mk15.5 centre section) was designed. In fact it looks like it's gone backwards! Paul True, but some would argue the validity of this test. The difference in resistance is so small compared to the resistance resulting from the angle of the unit in the water or the hydrostatic effects on the unit. Anyway, I'm not complaining or anything (except that I still think the SK is a pretty damned good little unit). Aloha, Charlie __________________ "Foolish consistency is the hobgoblin of little minds." - Emerson "Hobgoblin is a cool word." - Charlie
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