The Pelagian Way

Drmike · 5th September 2007, 15:15

Quote: (Originally Posted by Rebreatherlab)

That looks great Mike!
it is pretty much what I tried to do long time ago, but didn't as I thought the 1 degree taper would be too tricky. How did you solve the channels inside the block? It looks like you just drilled a hole from short to short side. have you noticed any different CV charachteristis compared to the SL body? I sure looks tidier than my solution.

Hats off for Dr Mike!

Andy

Had to buy the tooling but was straight forward enough reproducing the exact same holes. Internals of the block is remarkably similar in design to the inside of a Diverite wing inflator

(just machined in solid) with the needle valve fed from inlet side the 'inflator; would be but with a small internal hole from needle to outlet side of 'inflator'. Flow rate min-max is same as original.

steevke · 5th September 2007, 15:29

Quote: (Originally Posted by Drmike)

The swagelok needle valve comes in 2 parts.
the top part ... SNIP

Thanks Mike.

Last question: did you use a metal to metal seal between the brass (I presume) block and SS needle (if so don't you fear damage?) or did you use a nylon/teflon insert?

Steven

Drmike · 6th September 2007, 02:14

Quote: (Originally Posted by steevke)

Thanks Mike.

Last question: did you use a metal to metal seal between the brass (I presume) block and SS needle (if so don't you fear damage?) or did you use a nylon/teflon insert?

Steven

I used a Fluorocarbon seal to seal the valve body to the block - but metal to metal for the needle to block. Shouldnt be any wear issues given the min usage (note: Swagelok brass body needle valves have same arrangement)

bjornaow · 6th September 2007, 16:34

Hi Andy

I have some question about your 2 or 3 cells on the Pelagian. Where have you putt the cells (in the head)?

And is there room for 2 or 3 cells at the same space or do you have to use a VR3 for the 3;de cell.

The reason i wonder is if you conect a shearwater to the pelagian then it would be hard to do that if there is only room for 2 cells.

Also if there is space for 3 cells. Do you sell it with a 3 display like KISS (jetstream) do?

And last are there any pictures on this things.

Best regards

Björn Qvarnström

Who is right now saving to go to Thailand and hopefully a tripp to Koh samui to become a ccr diver hopping i’m not getting old before he he he....

**Gill Envy** · 6th September 2007, 18:02

here's a nice primer on the Pelagian; it's design and philosopy:http://www.deeperblue.net/article.php/775/33/1

it appears that the space for the third cell is right next to the to the other two.

hope that helps...Hopefully Andy will clarify further.

g

[/url]

Quote: (Originally Posted by bjornaow)

Hi Andy

I have some question about your 2 or 3 cells on the Pelagian. Where have you putt the cells (in the head)?

And is there room for 2 or 3 cells at the same space or do you have to use a VR3 for the 3;de cell.

The reason i wonder is if you conect a shearwater to the pelagian then it would be hard to do that if there is only room for 2 cells.

Also if there is space for 3 cells. Do you sell it with a 3 display like KISS (jetstream) do?

And last are there any pictures on this things.

Best regards

Björn Qvarnström

Who is right now saving to go to Thailand and hopefully a tripp to Koh samui to become a ccr diver hopping i’m not getting old before he he he....

Rebreatherlab · 6th September 2007, 23:07

Hej Björn,

Lets see if I can clarify this a bit for you.

Quote: (Originally Posted by bjornaow)

Hi Andy

I have some question about your 2 or 3 cells on the Pelagian. Where have you putt the cells (in the head)?

Andy: Yes, there are three cell sockets in the scubber head.

And is there room for 2 or 3 cells at the same space or do you have to use a VR3 for the 3;de cell.

Andy: The Pelagian's own display shows you 2 cell read outs. The reason it does not give you 3 read out's is because then you would have to connect a VR3 or other computer to one of the three cells. If the Pelagian display and the Vr3 would share one cell they would not be truly independent and if you would have a leak in the VR3 with a following short circuit between power and signal it could take the Pelagian display with it or at least affect the reading.

The reason i wonder is if you conect a shearwater to the pelagian then it would be hard to do that if there is only room for 2 cells.

Andy: You can connect the Shearwater to cell # three and thereby get two independent sources for PO2 info. I would not recommend you connect the Shearwater to all three cells as this would again kill the true redundancy between computer and Pelagian displays.

Also if there is space for 3 cells. Do you sell it with a 3 display like KISS (jetstream) do?

Andy: No. The main reason is that there are only space for two cable connections on the Pelagian head. If we offered a three cell display it would either have to share ground and battery or at most keep one cell totally isolated from the other two cells. As you see there would be little point in this. Another reason is that the Pelagian has instant cell validation which means it is very quick and easy to check the cells at regular intervals during the dive. With our current set up you can choose to connect a HUD, VR3, Shearwater or our upcoming single display and have better redundancy than most 3 cell systems.

And last are there any pictures on this things.

The attached picture should clarify i hope. If you send me an email I can send you many other pics with other parts and details.

All the best,

Andy

Best regards

Björn Qvarnström

Who is right now saving to go to Thailand and hopefully a tripp to Koh samui to become a ccr diver hopping i’m not getting old before he he he....

**wedivebc** · 7th September 2007, 00:14

Quote: (Originally Posted by Rebreatherlab)

Hej Björn,

Lets see if I can clarify this a bit for you.

Hey Andy, are those sensors modified in any way?

**Gill Envy** · 7th September 2007, 01:18

just to be clear, it's my understanding that the Shearwater can be hooked up to 0, 1 or 3 cells while the HUD must be hooked up to all three cells.
g

decoweenie · 7th September 2007, 05:22

Quote: (Originally Posted by wedivebc)

Hey Andy, are those sensors modified in any way?

Looks like the front plastic section has been cut off to expose the membrane so diluent could be blown across it.

dave t · 7th September 2007, 08:00

Andy when the diver is in normal swimming position do the sensors face up or down?

thanks

Dave

5th September 2007, 15:15	#61 (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: 3,301	Re: The Pelagian Way Quote: (Originally Posted by Rebreatherlab) That looks great Mike! it is pretty much what I tried to do long time ago, but didn't as I thought the 1 degree taper would be too tricky. How did you solve the channels inside the block? It looks like you just drilled a hole from short to short side. have you noticed any different CV charachteristis compared to the SL body? I sure looks tidier than my solution. Hats off for Dr Mike! Andy Had to buy the tooling but was straight forward enough reproducing the exact same holes. Internals of the block is remarkably similar in design to the inside of a Diverite wing inflator (just machined in solid) with the needle valve fed from inlet side the 'inflator; would be but with a small internal hole from needle to outlet side of 'inflator'. Flow rate min-max is same as original. __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
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5th September 2007, 15:29	#62 (permalink)
steevke Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Sport Kiss Join Date: Jul 2005 Location: Belgium Posts: 311	Re: The Pelagian Way Quote: (Originally Posted by Drmike) The swagelok needle valve comes in 2 parts. the top part ... SNIP Thanks Mike. Last question: did you use a metal to metal seal between the brass (I presume) block and SS needle (if so don't you fear damage?) or did you use a nylon/teflon insert? Steven
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6th September 2007, 02:14	#63 (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: 3,301	Re: The Pelagian Way Quote: (Originally Posted by steevke) Thanks Mike. Last question: did you use a metal to metal seal between the brass (I presume) block and SS needle (if so don't you fear damage?) or did you use a nylon/teflon insert? Steven I used a Fluorocarbon seal to seal the valve body to the block - but metal to metal for the needle to block. Shouldnt be any wear issues given the min usage (note: Swagelok brass body needle valves have same arrangement) __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment Last edited by Drmike : 6th September 2007 at 02:17.
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6th September 2007, 16:34	#64 (permalink)
bjornaow New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Nov 2005 Location: SWEDEN Posts: 20	Re: The Pelagian Way Hi Andy I have some question about your 2 or 3 cells on the Pelagian. Where have you putt the cells (in the head)? And is there room for 2 or 3 cells at the same space or do you have to use a VR3 for the 3;de cell. The reason i wonder is if you conect a shearwater to the pelagian then it would be hard to do that if there is only room for 2 cells. Also if there is space for 3 cells. Do you sell it with a 3 display like KISS (jetstream) do? And last are there any pictures on this things. Best regards Björn Qvarnström Who is right now saving to go to Thailand and hopefully a tripp to Koh samui to become a ccr diver hopping i’m not getting old before he he he....
(Offline)

6th September 2007, 18:02	#65 (permalink)
Gill Envy Shearwater Copis Divers Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,326	Re: The Pelagian Way here's a nice primer on the Pelagian; it's design and philosopy:http://www.deeperblue.net/article.php/775/33/1 it appears that the space for the third cell is right next to the to the other two. hope that helps...Hopefully Andy will clarify further. g [/url] Quote: (Originally Posted by bjornaow) Hi Andy I have some question about your 2 or 3 cells on the Pelagian. Where have you putt the cells (in the head)? And is there room for 2 or 3 cells at the same space or do you have to use a VR3 for the 3;de cell. The reason i wonder is if you conect a shearwater to the pelagian then it would be hard to do that if there is only room for 2 cells. Also if there is space for 3 cells. Do you sell it with a 3 display like KISS (jetstream) do? And last are there any pictures on this things. Best regards Björn Qvarnström Who is right now saving to go to Thailand and hopefully a tripp to Koh samui to become a ccr diver hopping i’m not getting old before he he he.... __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°>
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7th September 2007, 00:14	#67 (permalink)
wedivebc Dave Tomblin Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,447	Re: The Pelagian Way Quote: (Originally Posted by Rebreatherlab) Hej Björn, Lets see if I can clarify this a bit for you. Hey Andy, are those sensors modified in any way? __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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7th September 2007, 01:18	#68 (permalink)
Gill Envy Shearwater Copis Divers Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,326	Re: The Pelagian Way just to be clear, it's my understanding that the Shearwater can be hooked up to 0, 1 or 3 cells while the HUD must be hooked up to all three cells. g __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°>
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7th September 2007, 05:22	#69 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: The Pelagian Way Quote: (Originally Posted by wedivebc) Hey Andy, are those sensors modified in any way? Looks like the front plastic section has been cut off to expose the membrane so diluent could be blown across it. __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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7th September 2007, 08:00	#70 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 654	Re: The Pelagian Way Andy when the diver is in normal swimming position do the sensors face up or down? thanks Dave
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