New 4th cells 4 megs

Paul Evans · 17th August 2007, 10:20

Quote: (Originally Posted by andy_t576)

hi guy's me and john from narked @90 ar currently working on this the adaptor is done john's sorting the piggybacking so we aim to please all been working on this for a while for j keeps new shearwater.

Thats simple, wire staright into the Aux port on the new heads

annetj · 21st August 2007, 11:09

I had my first dive with a 4th cell connected to my VR3 on Saturday, and I LOVED it!!

Anne

gtzavelas · 21st August 2007, 11:18

I am still debating the pros/cons of having a 4th cell on my meg.
So far i have decided against it.
One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket)
So I would go with the ISC solution and put in on the bottom of the lung.
What do you guys think about this point?

JonnyB · 21st August 2007, 11:50

Quote: (Originally Posted by gtzavelas)

I am still debating the pros/cons of having a 4th cell on my meg.
So far i have decided against it.
One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket)
So I would go with the ISC solution and put in on the bottom of the lung.
What do you guys think about this point?

I thought like you, but after speaking to different people i have decided that the best sollution for me is this way.
Let me explain why!
If you are a diver who likes to dive the unit manually and have the electronics as a backup then every time you manually add O2 the computer will spike as you are adding O2 straight to the cell.

/Jonny

Gilles · 21st August 2007, 14:21

Quote: (Originally Posted by gtzavelas)

I am still debating the pros/cons of having a 4th cell on my meg.
So far i have decided against it.
One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket)
So I would go with the ISC solution and put in on the bottom of the lung.
What do you guys think about this point?

I'm unfamiliar with the ISC solution. Right on the bottom of the lung? Will get kinda wet no? Somewhere near the top would seem better, or the manner illustrated above (next to the existing 3) seems ok by me.

Quote: (Originally Posted by JonnyB)

I thought like you, but after speaking to different people i have decided that the best sollution for me is this way.
Let me explain why!
If you are a diver who likes to dive the unit manually and have the electronics as a backup then every time you manually add O2 the computer will spike as you are adding O2 straight to the cell.

/Jonny

Not if you switch your O2 man-ad to the opposite lung that the cell is installed in.

Can't say I feel sufficient value by the whole concept to justify the cost/complication. The redundancy value after 3 cells seems quite diminished, but still listening...

JonnyB · 21st August 2007, 14:46

Quote: (Originally Posted by Gilles)

Not if you switch your O2 man-ad to the opposite lung that the cell is installed in.

Ofcourse not then you are breaking the left-Lean right-Rich standard. I would rather turn the hoses and the mushroom valves

/Jonny

Outlaw · 21st August 2007, 14:56

Quote: (Originally Posted by JonnyB)

Ofcourse not then you are breaking the left-Lean right-Rich standard. I would rather turn the hoses and the mushroom valves

/Jonny

hey Jonny, hey guys,

Jonny, do you think there is a problem if you change your 02 add on to the left lung, instead of the right one.? i think its good because if you are scootering, then you have your left hand to do stuff, and also if in case you have a problem with the solenoid or reg, you cannot close the 02 valve and open at the same time you are adding. so i think having it on the left is better. tell me, i am serious as i am modifying my meg set up.

Also, if you wish to have your o2 sp higher than 1.4, you dont have to have one hand on the valve and one on the hose blocking it forcing the gas to go around the loop. you just add o2 if the injection is on the left lung, and the valves on the dsv will block it passing. so it would still go around fine. don't you agree?

Cheers.

Padowan · 21st August 2007, 16:48

What I'd like to know is this:

If a cell can spike to (the mV equivalent of) 1.6+, does this imply that it can deliver a constant output of the same?

If I use the analogy of a battery, these can deliver initial voltage spikes (something like a capacitative discharge I assume) that are of a higher voltage that the sustainable voltage.....

To me, the spike to 1.6 is useful, but not an absolute validation that the cell is capable of delivering a constant high output. As Dave (decodiver) mentioned, a spike to 1.8 would give me more confidence that the cell was capable of delivering a higher constant output, than a spike to 1.6.

Depth-junkie · 21st August 2007, 17:13

Quote: (Originally Posted by Padowan)

What I'd like to know is this:

If a cell can spike to (the mV equivalent of) 1.6+, does this imply that it can deliver a constant output of the same?

If I use the analogy of a battery, these can deliver initial voltage spikes (something like a capacitative discharge I assume) that are of a higher voltage that the sustainable voltage.....

To me, the spike to 1.6 is useful, but not an absolute validation that the cell is capable of delivering a constant high output. As Dave (decodiver) mentioned, a spike to 1.8 would give me more confidence that the cell was capable of delivering a higher constant output, than a spike to 1.6.

But if the cells checked out at 1.6 at the start, you have to get them to fail from 1.6 to 1.25 ish before it becomes a problem of the unit trying to get up 1.3 SP, which it obvioulsy cant reach according to the cells so the unit continues to fire in 02 you tox and die. Surley the sound of the soliniod firing and the suddon drop of SP would give you an idication something is wrong.

From 1.6 to 1.25 is quite a drop during a period of a dive IMHO.

ATB
Gareth

JonnyB · 21st August 2007, 17:44

Quote: (Originally Posted by Outlaw)

hey Jonny, hey guys,

Jonny, do you think there is a problem if you change your 02 add on to the left lung, instead of the right one.? i think its good because if you are scootering, then you have your left hand to do stuff, and also if in case you have a problem with the solenoid or reg, you cannot close the 02 valve and open at the same time you are adding. so i think having it on the left is better. tell me, i am serious as i am modifying my meg set up.

Also, if you wish to have your o2 sp higher than 1.4, you dont have to have one hand on the valve and one on the hose blocking it forcing the gas to go around the loop. you just add o2 if the injection is on the left lung, and the valves on the dsv will block it passing. so it would still go around fine. don't you agree?

Cheers.

From what i know, every single rebreather except the Prism, has the RR-LL standard. I dont know if the prism has the additions right, but i am sure the bottles are crossed.
Anyhow, by having this that way then you will always know that every one else who dives a rebreather knows which addition to use in case of an emergency. For self rescue and to save a buddy.
Other than that, for me O2 on right hand is kind of grown into my habit. And makes me work automatically.

/Jonny

17th August 2007, 10:20	#31 (permalink)
Paul Evans Freedom is the Key. Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Oct 2006 Location: London Posts: 135	Re: New 4th cells 4 megs Quote: (Originally Posted by andy_t576) hi guy's me and john from narked @90 ar currently working on this the adaptor is done john's sorting the piggybacking so we aim to please all been working on this for a while for j keeps new shearwater. Thats simple, wire staright into the Aux port on the new heads __________________ "Freedom is what you do with what's been done to you." Jean-Paul Sartre "Any time anyone says, 'there is only one right way to do this' your bullshit meter should be pegged. Its a presumptive statement, made by a person who fears being proved wrong." Bill Gavin.
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21st August 2007, 11:09	#32 (permalink)
annetj New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2006 Location: Oslo, Norway Posts: 26	Re: New 4th cells 4 megs I had my first dive with a 4th cell connected to my VR3 on Saturday, and I LOVED it!! Anne
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21st August 2007, 11:18	#33 (permalink)
gtzavelas Rebreather World Writer Current Rebreather/s: Megalodon RB80 / Clone Other Rebreather/s: RB80 / Clone Join Date: Jan 2006 Location: Athens,Greece Posts: 264	Re: New 4th cells 4 megs I am still debating the pros/cons of having a 4th cell on my meg. So far i have decided against it. One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket) So I would go with the ISC solution and put in on the bottom of the lung. What do you guys think about this point?
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21st August 2007, 11:50	#34 (permalink)
JonnyB Johnny The Hatch Current Rebreather/s: MK 15.X Titan Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Megalodon Sport Kiss Classic Kiss Other CCR Other SCR Home Build Join Date: Jan 2005 Location: Sweden (Stockholm)/Cyprus(Ayia Napa) Posts: 975	Re: New 4th cells 4 megs Quote: (Originally Posted by gtzavelas) I am still debating the pros/cons of having a 4th cell on my meg. So far i have decided against it. One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket) So I would go with the ISC solution and put in on the bottom of the lung. What do you guys think about this point? I thought like you, but after speaking to different people i have decided that the best sollution for me is this way. Let me explain why! If you are a diver who likes to dive the unit manually and have the electronics as a backup then every time you manually add O2 the computer will spike as you are adding O2 straight to the cell. /Jonny __________________ A quote from Crazyduck - In remembering our own Rob Davies. "Outbound flight 777 heavy you are cleared for flight Due west into that warm red Texas sunset You have angels on your wings and divers memories on your six." Rest In Peace http://www.divetekcyprus.com http://www.diveccr.com
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21st August 2007, 14:21	#35 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: New 4th cells 4 megs Quote: (Originally Posted by gtzavelas) I am still debating the pros/cons of having a 4th cell on my meg. So far i have decided against it. One of the points I am considering is that if I go ahead with a 4th cell I would prefer NOT to have it in the same location as the other 3. (as we say not to have all the eggs in the same basket) So I would go with the ISC solution and put in on the bottom of the lung. What do you guys think about this point? I'm unfamiliar with the ISC solution. Right on the bottom of the lung? Will get kinda wet no? Somewhere near the top would seem better, or the manner illustrated above (next to the existing 3) seems ok by me. Quote: (Originally Posted by JonnyB) I thought like you, but after speaking to different people i have decided that the best sollution for me is this way. Let me explain why! If you are a diver who likes to dive the unit manually and have the electronics as a backup then every time you manually add O2 the computer will spike as you are adding O2 straight to the cell. /Jonny Not if you switch your O2 man-ad to the opposite lung that the cell is installed in. Can't say I feel sufficient value by the whole concept to justify the cost/complication. The redundancy value after 3 cells seems quite diminished, but still listening... __________________ Gilles http://www.dirrebreather.com Last edited by Gilles : 21st August 2007 at 14:26.
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21st August 2007, 14:46	#36 (permalink)
JonnyB Johnny The Hatch Current Rebreather/s: MK 15.X Titan Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Megalodon Sport Kiss Classic Kiss Other CCR Other SCR Home Build Join Date: Jan 2005 Location: Sweden (Stockholm)/Cyprus(Ayia Napa) Posts: 975	Re: New 4th cells 4 megs Quote: (Originally Posted by Gilles) Not if you switch your O2 man-ad to the opposite lung that the cell is installed in. Ofcourse not then you are breaking the left-Lean right-Rich standard. I would rather turn the hoses and the mushroom valves /Jonny __________________ A quote from Crazyduck - In remembering our own Rob Davies. "Outbound flight 777 heavy you are cleared for flight Due west into that warm red Texas sunset You have angels on your wings and divers memories on your six." Rest In Peace http://www.divetekcyprus.com http://www.diveccr.com
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21st August 2007, 14:56	#37 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 640	Re: New 4th cells 4 megs Quote: (Originally Posted by JonnyB) Ofcourse not then you are breaking the left-Lean right-Rich standard. I would rather turn the hoses and the mushroom valves /Jonny hey Jonny, hey guys, Jonny, do you think there is a problem if you change your 02 add on to the left lung, instead of the right one.? i think its good because if you are scootering, then you have your left hand to do stuff, and also if in case you have a problem with the solenoid or reg, you cannot close the 02 valve and open at the same time you are adding. so i think having it on the left is better. tell me, i am serious as i am modifying my meg set up. Also, if you wish to have your o2 sp higher than 1.4, you dont have to have one hand on the valve and one on the hose blocking it forcing the gas to go around the loop. you just add o2 if the injection is on the left lung, and the valves on the dsv will block it passing. so it would still go around fine. don't you agree? Cheers. __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw" Last edited by Outlaw : 21st August 2007 at 15:00. Reason: forget something.
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21st August 2007, 16:48	#38 (permalink)
Padowan Proper Boffin Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Kent, UK. Posts: 518	Re: New 4th cells 4 megs What I'd like to know is this: If a cell can spike to (the mV equivalent of) 1.6+, does this imply that it can deliver a constant output of the same? If I use the analogy of a battery, these can deliver initial voltage spikes (something like a capacitative discharge I assume) that are of a higher voltage that the sustainable voltage..... To me, the spike to 1.6 is useful, but not an absolute validation that the cell is capable of delivering a constant high output. As Dave (decodiver) mentioned, a spike to 1.8 would give me more confidence that the cell was capable of delivering a higher constant output, than a spike to 1.6. __________________ Padowan The future's bright, the future's Yellow .....for now padowan.net - Latest Video: Scapa Flow Rebreather Diving
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21st August 2007, 17:13	#39 (permalink)
Depth-junkie 10/52 Psycho Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2005 Location: Wrexham Posts: 298	Re: New 4th cells 4 megs Quote: (Originally Posted by Padowan) What I'd like to know is this: If a cell can spike to (the mV equivalent of) 1.6+, does this imply that it can deliver a constant output of the same? If I use the analogy of a battery, these can deliver initial voltage spikes (something like a capacitative discharge I assume) that are of a higher voltage that the sustainable voltage..... To me, the spike to 1.6 is useful, but not an absolute validation that the cell is capable of delivering a constant high output. As Dave (decodiver) mentioned, a spike to 1.8 would give me more confidence that the cell was capable of delivering a higher constant output, than a spike to 1.6. But if the cells checked out at 1.6 at the start, you have to get them to fail from 1.6 to 1.25 ish before it becomes a problem of the unit trying to get up 1.3 SP, which it obvioulsy cant reach according to the cells so the unit continues to fire in 02 you tox and die. Surley the sound of the soliniod firing and the suddon drop of SP would give you an idication something is wrong. From 1.6 to 1.25 is quite a drop during a period of a dive IMHO. ATB Gareth
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21st August 2007, 17:44	#40 (permalink)
JonnyB Johnny The Hatch Current Rebreather/s: MK 15.X Titan Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Megalodon Sport Kiss Classic Kiss Other CCR Other SCR Home Build Join Date: Jan 2005 Location: Sweden (Stockholm)/Cyprus(Ayia Napa) Posts: 975	Re: New 4th cells 4 megs Quote: (Originally Posted by Outlaw) hey Jonny, hey guys, Jonny, do you think there is a problem if you change your 02 add on to the left lung, instead of the right one.? i think its good because if you are scootering, then you have your left hand to do stuff, and also if in case you have a problem with the solenoid or reg, you cannot close the 02 valve and open at the same time you are adding. so i think having it on the left is better. tell me, i am serious as i am modifying my meg set up. Also, if you wish to have your o2 sp higher than 1.4, you dont have to have one hand on the valve and one on the hose blocking it forcing the gas to go around the loop. you just add o2 if the injection is on the left lung, and the valves on the dsv will block it passing. so it would still go around fine. don't you agree? Cheers. From what i know, every single rebreather except the Prism, has the RR-LL standard. I dont know if the prism has the additions right, but i am sure the bottles are crossed. Anyhow, by having this that way then you will always know that every one else who dives a rebreather knows which addition to use in case of an emergency. For self rescue and to save a buddy. Other than that, for me O2 on right hand is kind of grown into my habit. And makes me work automatically. /Jonny __________________ A quote from Crazyduck - In remembering our own Rob Davies. "Outbound flight 777 heavy you are cleared for flight Due west into that warm red Texas sunset You have angels on your wings and divers memories on your six." Rest In Peace http://www.divetekcyprus.com http://www.diveccr.com
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