Which M values do you know for dive computers?

teomannaskali · 6th August 2008, 15:10

Which M values for which computers do you know? I am tring to recalculate how the computers caluclate deco and especially how the computers change which M value for consecutive dives.

Any pointers to current M values would be appreciated.

Teoman

**nigelh** · 6th August 2008, 15:47

Quote: (Originally Posted by teomannaskali)

Which M values for which computers do you know? I am tring to recalculate how the computers caluclate deco and especially how the computers change which M value for consecutive dives.

I think you'll find that computers just leave the comparments loaded at the start of the next dive.

Are Bühlmann's a/b values any use? I think most computers use his model unless they are doing something significantly different like a bubble model.

lizardland · 6th August 2008, 15:52

Quote: (Originally Posted by nigelh)

I think you'll find that computers just leave the comparments loaded at the start of the next dive.

Are Bühlmann's a/b values any use? I think most computers use his model unless they are doing something significantly different like a bubble model.

Don't Uwatec computers use a cut-down version of Buhlmann rather than the full 16 compartment model? Can't recall if it's 8 or 12 but I'm pretty sure they aren't on the full model. A lot of computers used Uwatec boards in rebranded shells.

**nigelh** · 6th August 2008, 15:59

Quote: (Originally Posted by lizardland)

Don't Uwatec computers use a cut-down version of Buhlmann rather than the full 16 compartment model? Can't recall if it's 8 or 12 but I'm pretty sure they aren't on the full model. A lot of computers used Uwatec boards in rebranded shells.

I seem to remember something like that.

Since ZH's compartment 13 is a half time of over five hours you'd have to do a pretty serious dive for that to become the controlling ceiling.

Humuhumu · 22nd August 2008, 21:07

Hi,

the original Bühlmann model was always a 16 compartments model. Originally Bühlmann used only 12 pairs of M-Values (one for nitrogen and one for helium), after that he developed mathematically the model to 16 pairs of M-values. To my knowledge, it is the C version that is used in computers. A is the base model (unusable, means 100/100 gradient factor), B, for the tables (usualy near to 90/90, conservative) and C for real time processing like in computers (in this case a good computer allows you to do more ore less what you want... choose to live or to die).

You can find some good information on the Shearwater website.

Cheers

Humuhumu

teomannaskali · 22nd August 2008, 22:25

What language is humuhumu nukunuku apua? If it is not sychobabble.

teoman

Mark Chase · 22nd August 2008, 22:39

The VR3 ran aproxamatly 20/85GFwhen set to zero safety.

ATB

Mark

curt · 23rd August 2008, 06:05

Quote: (Originally Posted by teomannaskali)

What language is humuhumu nukunuku apua? If it is not sychobabble.

It's Hawai'ian. And it's actually humu humu nuku nuku apua`a, which is the official State Fish of Hawai'i. The name translates roughly as "Trigger fish with a snout like a pig".

cheers...

Humuhumu · 23rd August 2008, 09:58

Quote: (Originally Posted by Mark Chase)

The VR3 ran aproxamatly 20/85GFwhen set to zero safety.

ATB

Mark

Absolutely, the VR3 gives deeper first stops in standard configuration than the Pursuit, that's what I have noticed as my friend Daniel has a VR3 and dived with me this summer.

Humuhumu · 23rd August 2008, 10:06

Quote: (Originally Posted by teomannaskali)

What language is humuhumu nukunuku apua? If it is not sychobabble.

teoman

Aloha,

Curt is right, it's Hawaiian. As I love the Hawaiian islands, I took this name. Have a look to my avatar: it's a Humuhumu Nukunuku Apua'a.

Cheers

Humuhumu

6th August 2008, 15:10	#1 (permalink)
teomannaskali RBW Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 421	Which M values do you know for dive computers? Which M values for which computers do you know? I am tring to recalculate how the computers caluclate deco and especially how the computers change which M value for consecutive dives. Any pointers to current M values would be appreciated. Teoman Last edited by teomannaskali : 6th August 2008 at 15:13.
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6th August 2008, 15:47	#2 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 883	Re: Which M values do you know for dive computers? Quote: (Originally Posted by teomannaskali) Which M values for which computers do you know? I am tring to recalculate how the computers caluclate deco and especially how the computers change which M value for consecutive dives. I think you'll find that computers just leave the comparments loaded at the start of the next dive. Are Bühlmann's a/b values any use? I think most computers use his model unless they are doing something significantly different like a bubble model. __________________ nigelh
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6th August 2008, 15:52	#3 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,383	Re: Which M values do you know for dive computers? Quote: (Originally Posted by nigelh) I think you'll find that computers just leave the comparments loaded at the start of the next dive. Are Bühlmann's a/b values any use? I think most computers use his model unless they are doing something significantly different like a bubble model. Don't Uwatec computers use a cut-down version of Buhlmann rather than the full 16 compartment model? Can't recall if it's 8 or 12 but I'm pretty sure they aren't on the full model. A lot of computers used Uwatec boards in rebranded shells. __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
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6th August 2008, 15:59	#4 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 883	Re: Which M values do you know for dive computers? Quote: (Originally Posted by lizardland) Don't Uwatec computers use a cut-down version of Buhlmann rather than the full 16 compartment model? Can't recall if it's 8 or 12 but I'm pretty sure they aren't on the full model. A lot of computers used Uwatec boards in rebranded shells. I seem to remember something like that. Since ZH's compartment 13 is a half time of over five hours you'd have to do a pretty serious dive for that to become the controlling ceiling. __________________ nigelh
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22nd August 2008, 21:07	#5 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Which M values do you know for dive computers? Hi, the original Bühlmann model was always a 16 compartments model. Originally Bühlmann used only 12 pairs of M-Values (one for nitrogen and one for helium), after that he developed mathematically the model to 16 pairs of M-values. To my knowledge, it is the C version that is used in computers. A is the base model (unusable, means 100/100 gradient factor), B, for the tables (usualy near to 90/90, conservative) and C for real time processing like in computers (in this case a good computer allows you to do more ore less what you want... choose to live or to die). You can find some good information on the Shearwater website. Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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22nd August 2008, 22:25	#6 (permalink)
teomannaskali RBW Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 421	Re: Which M values do you know for dive computers? What language is humuhumu nukunuku apua? If it is not sychobabble. teoman
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22nd August 2008, 22:39	#7 (permalink)
Mark Chase RBW Member Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,854	Re: Which M values do you know for dive computers? The VR3 ran aproxamatly 20/85GFwhen set to zero safety. ATB Mark __________________ See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!! Kevin Juergensen 16/11/08 [/quote]
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23rd August 2008, 06:05	#8 (permalink)
curt New Member Current Rebreather/s: Other CCR Dolphin Other Rebreather/s: Not Bought Yet Inspiration Classic Classic Kiss MK 15.X Other CCR Dolphin Join Date: Jul 2006 Location: Rockville, MD USA Posts: 99	Re: Which M values do you know for dive computers? Quote: (Originally Posted by teomannaskali) What language is humuhumu nukunuku apua? If it is not sychobabble. It's Hawai'ian. And it's actually humu humu nuku nuku apua`a, which is the official State Fish of Hawai'i. The name translates roughly as "Trigger fish with a snout like a pig". cheers... __________________ Curt Harpold US Representative Rebreathers Australia http://rebreathers.com.au/
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23rd August 2008, 09:58	#9 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Which M values do you know for dive computers? Quote: (Originally Posted by Mark Chase) The VR3 ran aproxamatly 20/85GFwhen set to zero safety. ATB Mark Absolutely, the VR3 gives deeper first stops in standard configuration than the Pursuit, that's what I have noticed as my friend Daniel has a VR3 and dived with me this summer. __________________ Humuhumu Nukunuku Apua'a
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23rd August 2008, 10:06	#10 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Which M values do you know for dive computers? Quote: (Originally Posted by teomannaskali) What language is humuhumu nukunuku apua? If it is not sychobabble. teoman Aloha, Curt is right, it's Hawaiian. As I love the Hawaiian islands, I took this name. Have a look to my avatar: it's a Humuhumu Nukunuku Apua'a. Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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