Tried the Pelagian....

Mr_Pyro · 17th May 2008, 09:16

Quote: (Originally Posted by depth)

Hi

Since I almost entirely dive cold Scandinavian waters, I have a question regarding the scrubber.

I am currently using a meg, here the scrubber is a seperate unit from the can. This means that there is air between the aluminium can and the scrubber plexi glas. This isolates the scrubber from the cold aluminium can.

I know that heat is an important factor for the scrubber duration. The Peagian does not have this feature. Does this mean that the scrubber duration is effected to a larger degree when diving in cold water?

I like the thought of a smaller Rebreather, but not if it effects scrubber time considerably!

/Christian

I don't think that the Pelagian is more sensitive to cold water temperatures than the Meg.

First, the Pelagian scrubber has a thick plastic outer casing that has better heat insulation properties than the aluminium can of the Meg. We all know how great aluminium is to conduct heat :-)
I think that this somewhat makes upp for the fact that the scrubber chemicals of the Pelagian is only separated from the outside cold water by a single layer of material.

Second, Isn't the Pelagian internal scrubber diameter somewhat narrower than the Meg's? If so, wouldn't this leed to a somewhat more compact and hotter reaction zone, that would be less prone to heat loss and temperature drop due to cold ambient conditions, than a cooler "burning" larger diameter scrubber like the one in the Meg?

Third, the unit packs a big standard scrubber with a capacity of 3,4 kg of Sofnolime 797. This gives the cold water diver an added extra margin of saftey.

Fourth, The compact design of the Pelagian has less surface area that can be exposed to the cold enviroment than other rebreathers. Especially the breathing hoses are quite short and compact, reducing the risk of loss of heat to the surrounding enviroment. The CL are also wery well protected and insulated from the enviroment.

As of today, the Pelagian standard size scrubber, is rated to 6 hours in warm water and 4 hours in cold water. My own unit hasn't done enough hours in realy cold water to draw any conclusions yet...
After the end of this summer there will be a bunch more of Swedish and other cold water diving nationalities using the Pelagian, so then there will be more experience in ice cold waters with the Pelagian.

I'll gues Roger is the one to ask as he has a lot of experience on both units.

Btw the Pelagian is a sweet well balanced and very compact litle unit.
I'd like to think of it as the equivalent of a Sports Bike in the rebreather market.

A big engine = large scrubber capacity
High acceleration = Low WOB
very high max speed = no depth limit
high maneuverability = excelent trim and balance

Well it's actually a bit more than words that conects the Pelagain to a Sports Bike. The internal bladder of the counter lungs are made of inner tubes from motorcycle tyres, very tough

/Johan Fredin

PnL · 18th May 2008, 02:29

Here is Tyler modeling the Pelagian

PnL · 18th May 2008, 02:30

And here are pictures of Andy Fritz terrorizing potential pupils ....

rogeringebo · 18th May 2008, 05:37

Hi guys!
I would not worry to much about scrubber problems in cold water as I have done lots of ice diving back in the KISS days and that was fine. It has the same type of scrubber even though a bit smaller.
As the Pelagian holds more sorb then most units out there (Meg, KISS, Inspo etc) I am confident in its performance. Just dont forget to pre breath, guys!
Im thinking about making a 3mm neoprene sock over the scrubber...
The solution Meg has decided on is nice as the warm gas travels around the scrubber but it comes at a to high price for my liking.....huge casing with a rather small scrubber, lots of air inside that will make the unit bouyant even though its so heavy.
When it comes to clipping on multiple tanks a can vouch for that its a no brainer....just clip them on as you always do...some pics here http://www.rebreatherworld.com/rebre...-princess.html

Cheers
Roger

Buck-O-Five · 18th May 2008, 15:34

Quote: (Originally Posted by Tyler S.)

stupid friend left his name logged in on my computer, I got to got to try the Pelagian, not Brandon

Oops. Thanks for not using my login for putting all of my gear up for sale for $1.
I did get to knock back some beers with Andy while he was in San Diego. Too bad I didn't get to try out the Pelagian. Maybe when Paul gets his, I can take a test ride.

PnL · 18th May 2008, 16:18

Roger - were you able to sling multiple bottles on one side without it affecting the inhale counterlung? I typically sling all my bottles on the left ... its a vestige left over from my OC tech days and one that I feel comfortable with.

Thanks,
Paul

depth · 18th May 2008, 17:29

Quote: (Originally Posted by rogeringebo)

Hi guys!
I would not worry to much about scrubber problems in cold water as I have done lots of ice diving back in the KISS days and that was fine. It has the same type of scrubber even though a bit smaller.
As the Pelagian holds more sorb then most units out there (Meg, KISS, Inspo etc) I am confident in its performance. Just dont forget to pre breath, guys!
Im thinking about making a 3mm neoprene sock over the scrubber...
The solution Meg has decided on is nice as the warm gas travels around the scrubber but it comes at a to high price for my liking.....huge casing with a rather small scrubber, lots of air inside that will make the unit bouyant even though its so heavy.
When it comes to clipping on multiple tanks a can vouch for that its a no brainer....just clip them on as you always do...some pics here http://www.rebreatherworld.com/rebre...-princess.html

Cheers
Roger

Hi Roger

Has there been done any official scrubber duration tests on the Pelagian?

/Christian

**Gill Envy** · 19th May 2008, 04:43

hey Tyler, I've only done a few deepish dives in a range that i'd expect air dill not to drop my po2 adequately. Certainly going deeper than 200 will require hypoxic dill and trimix. Getting all the added certifcation may turn out to be of limited value to me though since the places i'd like to do long deep dives are on reefs that are so remote that getting anything other than compressed o2 and air is problematic... but that's really a subject for another post.

What attracts me to the needle valve on the Pelatian is that it sounds like a great way to tweek the o2 flow to match changing needs. Rapid descents were just one area I would find this convenient. I have my IP set to deliver just under my metabolic rate so that I hardly have to inject at all while at a constant depth, the downside to that is that it rises above 1.3 when i'm descending quickly even with adding dilluent. While that only happens for a short time, and i'm told many folks with eCCR's experience this as well, it would still be nice to have more control of... and then there is the advantage of removing the whole depth limit thing altogether.

Mod 2 and 3 are likely an inevitability and I guess i'm mostly looking down the road, for to the configuration in mCCR I will likely want so that I can make most of the big changes now and grow accustom to them before adding all the other additional complexity of multiple gas mixes and so on.

g

Quote: (Originally Posted by Tyler S.)

Gill I dont understand your po2 issues on deep dives. I dont have any problem on descent, what dil are you using? The dil should be doing its job by diluting the o2 thats being bled in, you should never have to turn your o2 off, unless you are at 200' on air dil

. I dont know about the Pelagian scrubber as I didnt see it torn apart. The needle valve kicks arse

**Gill Envy** · 19th May 2008, 04:46

Paul, thanks for such an informative post. this is exactly the kind of feedback I was hoping to get. Have some green.

g

Quote: (Originally Posted by PnL)

Andy would be the best person to answer your questions Gill, but I may be able to fill in some of the details in my review below as I had a chance to set up the unit, tear it down and dive it. As far as diving the Pelagian, several of us had the opportunity to try the Pelagian in San Diego and we all liked it. My impressions of the unit are as follows:

Size of The Pelagian.

The unit is VERY light and VERY compact. I had a nice long dive with it and it trimmed out very nicely - I guess all those reports I read about its trim weren't exaggerated

. It is very streamlined and has a very narrow profile, although this depends on the tanks you decide to use.

Scrubber.

The Pelagian doesn't use a separate scrubber canister and is designed to be very compact. It holds about 2.8 kg of 4-8 mesh sorb and filling it is more involved than on the rEvo, but is not a difficult chore. Andy does have a longer scrubber that has an eight hour duration and still has the same diameter scrubber, which is small! The ability to use tanks up to 7.25" in diameter (Al80) makes using the longer duration canister an easy task.

Gill - adding a radial scrubber canister would result in reduced sorb capacity due to the small size of the scrubber tube. I'm not sure how much benefit you could get with a lower capacity radial scrubber than a standard Pelagian scrubber.

Needle Valve.

I had reservations about the needle valve and how well it would work, but after having dived it I found it easy to adjust the flow to match my metabolic rate. I thought it was actually easier to dive the Pelagian because once you set the flow you don't have to manually add as often. The fact that it doesn't have a blocked first stage means you can take this deep without modifications. For those who still fear the needle valve - just don't use it and add O2 as you would any mCCR - its no different. But adjusting it on the fly is very simple and effective.

Turning the needle valve completely down does not shut off the O2 flow, on the unit I tried, the flow at the lowest setting was about 0.1 lpm. Andy tests the flow with a flow meter to show this and also so you can know what your metabolic rate it. Its very easy to determine your metabolic rate at different work loads with this unit, just measure the flow coming out of the valve after setting it.

Counterlungs.

The front mounted counterlungs follow the shoulder straps of your harness (standard hogarthian routing) so they are to the side. I didn't find any issues with slinging an Al40, but access to the D-rings is diminished since the counterlungs are on top of the harness webbing. I'm not sure what it would be like slinging multiple bottles. I think side-mounting would be a good solution, but I did not try this. I did not find the counterlungs to be intrusive and the WOB was pretty good - no complaints here.

There are two things the Pelagian counterlungs can do that I can't on my rEvo. First is the ability to remove water from the loop and the second thing is that you can do a positive test on the rig, something I am not able to do with the rEvo.

Pelagian Display.

I am used to the HUD on the rEvo, but diving without one was not a problem. The Pelagian display is quite small and light and was easy to see and keep out of the way. I was able to keep setpoint easily, especially after reaching my depth and adjusting the needle valve. I also liked that the Pelagian display uses a reed switch to turn on the display. The cable is also very durable and the display can hang off it without much worry ... although I'm sure this would not be recommended ... its much tougher than the audio cables used in other display applications.

Head.

The head of the Pelagian is very compact. It holds three cells, which need to be modified in order to fit the compact head, and to allow for the Instant Cell Validation. I had reservations about this as well. But it is VERY simple to do and will tell you how well your cells are working very quickly. However - you will have to do some math to know what the PPO2 should be at the depth you test your cells at, but its standard math that every diver has gone through many multiple times in courses

ADV.

I was not able to reach the ADV to manually activate it. But in the scenarios we discussed there were multiple options for flushing the loop. The ADV is sensitive in certain positions so the user must be aware of this - but you can take advantage of this to do a quick power flush of your entire loop. The ADV worked well in standard positions, but was more sensitive in a head-up position and face-up position.

Position of Valves.

I like having the valves up top. I find them to be much easier to reach then behind my back, especially with my wing inflated. It also puts more weight on top, which is one of the reasons for the great trim.

CONCLUSION.

I had the opportunity to not only dive the Pelagian, but went through preliminary Pelagian training with Andy. This gave me a great opportunity to learn a lot about the unit and Andy's philosophies. I think the Pelagian is a very solid unit with great characteristics. I would need more dives on it before I can make any final conclusions, but I truly do believe it is a great tool for diving. I'm hoping to be able to dive it more in the near future to see how well it fits into the diving I do. One thing that I can conclude is that Andy was able to dispel the reservations I had on the Pelagian.

My only comparison is to the rEvo, which is a great rebreather. The Pelagian does have some things I like better, but the rEvo has things I like better than the Pelagian. So for now, the jury is out until more dives are done on the Pelagian.

Also, I have to say that it was great to have Andy here in San Diego. He met most of the gang down here, had a chance to watch a local band, drink local beer, and eat good ol' American food

Paul

(BTW - I have some pictures of Tyler modeling the Pelagian ... I'll post those later this week)

Rebreatherlab · 19th May 2008, 04:56

Hi Gill,

Just start with a lower Po2 and you will not have any spiking. I typically start with pure O2, go to 20 ft, check cell liniarity, flush down to 0,6 or so and then just bomb down. Usually this puts me at 1,2 when reaching 160 ft. As we are talking fast descents you really dont have to worry about the short exposure below set point.

If I do a deeper dive with a slow descent and feel it would be nice to stay closer to set point during the descent I simply close the needle and metabolise some of the O2 on the way. depending on gas selection, depth and descent time this can actually work quite good.

Andy

Quote: (Originally Posted by Gill Envy)

hey Tyler, I've only done a few deepish dives in a range that i'd expect air dill not to drop my po2 adequately. Certainly going deeper than 200 will require hypoxic dill and trimix. Getting all the added certifcation may turn out to be of limited value to me though since the places i'd like to do long deep dives are on reefs that are so remote that getting anything other than compressed o2 and air is problematic... but that's really a subject for another post.

What attracts me to the needle valve on the Pelatian is that it sounds like a great way to tweek the o2 flow to match changing needs. Rapid descents were just one area I would find this convenient. I have my IP set to deliver just under my metabolic rate so that I hardly have to inject at all while at a constant depth, the downside to that is that it rises above 1.3 when i'm descending quickly even with adding dilluent. While that only happens for a short time, and i'm told many folks with eCCR's experience this as well, it would still be nice to have more control of... and then there is the advantage of removing the whole depth limit thing altogether.

Mod 2 and 3 are likely an inevitability and I guess i'm mostly looking down the road, for to the configuration in mCCR I will likely want so that I can make most of the big changes now and grow accustom to them before adding all the other additional complexity of multiple gas mixes and so on.

g

17th May 2008, 09:16	#11 (permalink)
Mr_Pyro New Member Current Rebreather/s: Pelagian Other Rebreather/s: Pelagian Join Date: Jul 2007 Location: Stockholm Posts: 36	Re: Tried the Pelagian.... Quote: (Originally Posted by depth) Hi Since I almost entirely dive cold Scandinavian waters, I have a question regarding the scrubber. I am currently using a meg, here the scrubber is a seperate unit from the can. This means that there is air between the aluminium can and the scrubber plexi glas. This isolates the scrubber from the cold aluminium can. I know that heat is an important factor for the scrubber duration. The Peagian does not have this feature. Does this mean that the scrubber duration is effected to a larger degree when diving in cold water? I like the thought of a smaller Rebreather, but not if it effects scrubber time considerably! /Christian I don't think that the Pelagian is more sensitive to cold water temperatures than the Meg. First, the Pelagian scrubber has a thick plastic outer casing that has better heat insulation properties than the aluminium can of the Meg. We all know how great aluminium is to conduct heat :-) I think that this somewhat makes upp for the fact that the scrubber chemicals of the Pelagian is only separated from the outside cold water by a single layer of material. Second, Isn't the Pelagian internal scrubber diameter somewhat narrower than the Meg's? If so, wouldn't this leed to a somewhat more compact and hotter reaction zone, that would be less prone to heat loss and temperature drop due to cold ambient conditions, than a cooler "burning" larger diameter scrubber like the one in the Meg? Third, the unit packs a big standard scrubber with a capacity of 3,4 kg of Sofnolime 797. This gives the cold water diver an added extra margin of saftey. Fourth, The compact design of the Pelagian has less surface area that can be exposed to the cold enviroment than other rebreathers. Especially the breathing hoses are quite short and compact, reducing the risk of loss of heat to the surrounding enviroment. The CL are also wery well protected and insulated from the enviroment. As of today, the Pelagian standard size scrubber, is rated to 6 hours in warm water and 4 hours in cold water. My own unit hasn't done enough hours in realy cold water to draw any conclusions yet... After the end of this summer there will be a bunch more of Swedish and other cold water diving nationalities using the Pelagian, so then there will be more experience in ice cold waters with the Pelagian. I'll gues Roger is the one to ask as he has a lot of experience on both units. Btw the Pelagian is a sweet well balanced and very compact litle unit. I'd like to think of it as the equivalent of a Sports Bike in the rebreather market. A big engine = large scrubber capacity High acceleration = Low WOB very high max speed = no depth limit high maneuverability = excelent trim and balance Well it's actually a bit more than words that conects the Pelagain to a Sports Bike. The internal bladder of the counter lungs are made of inner tubes from motorcycle tyres, very tough /Johan Fredin
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18th May 2008, 05:37	#14 (permalink)
rogeringebo Done with bubbles Current Rebreather/s: Pelagian Other Rebreather/s: Megalodon Classic Kiss Pelagian Join Date: Sep 2005 Location: Stockholm Sweden Posts: 674	Re: Tried the Pelagian.... Hi guys! I would not worry to much about scrubber problems in cold water as I have done lots of ice diving back in the KISS days and that was fine. It has the same type of scrubber even though a bit smaller. As the Pelagian holds more sorb then most units out there (Meg, KISS, Inspo etc) I am confident in its performance. Just dont forget to pre breath, guys! Im thinking about making a 3mm neoprene sock over the scrubber... The solution Meg has decided on is nice as the warm gas travels around the scrubber but it comes at a to high price for my liking.....huge casing with a rather small scrubber, lots of air inside that will make the unit bouyant even though its so heavy. When it comes to clipping on multiple tanks a can vouch for that its a no brainer....just clip them on as you always do...some pics here http://www.rebreatherworld.com/rebre...-princess.html Cheers Roger
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18th May 2008, 15:34	#15 (permalink)
Buck-O-Five CK #287 Pursuit & HUD Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Aug 2007 Location: San Diego, California Posts: 212	Re: Tried the Pelagian.... Quote: (Originally Posted by Tyler S.) stupid friend left his name logged in on my computer, I got to got to try the Pelagian, not Brandon Oops. Thanks for not using my login for putting all of my gear up for sale for $1. I did get to knock back some beers with Andy while he was in San Diego. Too bad I didn't get to try out the Pelagian. Maybe when Paul gets his, I can take a test ride. __________________ "The Brandon" www.sdtechdiving.com
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18th May 2008, 16:18	#16 (permalink)
PnL Custom Title Allowed! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Mar 2007 Location: San Diego, CA Posts: 169	Re: Tried the Pelagian.... Roger - were you able to sling multiple bottles on one side without it affecting the inhale counterlung? I typically sling all my bottles on the left ... its a vestige left over from my OC tech days and one that I feel comfortable with. Thanks, Paul __________________ SDTechDiving.com - A San Diego Technical Diving Community
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18th May 2008, 17:29	#17 (permalink)
depth Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Denmark Posts: 147	Re: Tried the Pelagian.... Quote: (Originally Posted by rogeringebo) Hi guys! I would not worry to much about scrubber problems in cold water as I have done lots of ice diving back in the KISS days and that was fine. It has the same type of scrubber even though a bit smaller. As the Pelagian holds more sorb then most units out there (Meg, KISS, Inspo etc) I am confident in its performance. Just dont forget to pre breath, guys! Im thinking about making a 3mm neoprene sock over the scrubber... The solution Meg has decided on is nice as the warm gas travels around the scrubber but it comes at a to high price for my liking.....huge casing with a rather small scrubber, lots of air inside that will make the unit bouyant even though its so heavy. When it comes to clipping on multiple tanks a can vouch for that its a no brainer....just clip them on as you always do...some pics here http://www.rebreatherworld.com/rebre...-princess.html Cheers Roger Hi Roger Has there been done any official scrubber duration tests on the Pelagian? /Christian __________________ I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not.............
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19th May 2008, 04:43	#18 (permalink)
Gill Envy Shearwater Copis Diver Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,255	Re: Tried the Pelagian.... hey Tyler, I've only done a few deepish dives in a range that i'd expect air dill not to drop my po2 adequately. Certainly going deeper than 200 will require hypoxic dill and trimix. Getting all the added certifcation may turn out to be of limited value to me though since the places i'd like to do long deep dives are on reefs that are so remote that getting anything other than compressed o2 and air is problematic... but that's really a subject for another post. What attracts me to the needle valve on the Pelatian is that it sounds like a great way to tweek the o2 flow to match changing needs. Rapid descents were just one area I would find this convenient. I have my IP set to deliver just under my metabolic rate so that I hardly have to inject at all while at a constant depth, the downside to that is that it rises above 1.3 when i'm descending quickly even with adding dilluent. While that only happens for a short time, and i'm told many folks with eCCR's experience this as well, it would still be nice to have more control of... and then there is the advantage of removing the whole depth limit thing altogether. Mod 2 and 3 are likely an inevitability and I guess i'm mostly looking down the road, for to the configuration in mCCR I will likely want so that I can make most of the big changes now and grow accustom to them before adding all the other additional complexity of multiple gas mixes and so on. g Quote: (Originally Posted by Tyler S.) Gill I dont understand your po2 issues on deep dives. I dont have any problem on descent, what dil are you using? The dil should be doing its job by diluting the o2 thats being bled in, you should never have to turn your o2 off, unless you are at 200' on air dil . I dont know about the Pelagian scrubber as I didnt see it torn apart. The needle valve kicks arse __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°>
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19th May 2008, 04:46	#19 (permalink)
Gill Envy Shearwater Copis Diver Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,255	Re: Tried the Pelagian.... Paul, thanks for such an informative post. this is exactly the kind of feedback I was hoping to get. Have some green. g Quote: (Originally Posted by PnL) Andy would be the best person to answer your questions Gill, but I may be able to fill in some of the details in my review below as I had a chance to set up the unit, tear it down and dive it. As far as diving the Pelagian, several of us had the opportunity to try the Pelagian in San Diego and we all liked it. My impressions of the unit are as follows: Size of The Pelagian. The unit is VERY light and VERY compact. I had a nice long dive with it and it trimmed out very nicely - I guess all those reports I read about its trim weren't exaggerated . It is very streamlined and has a very narrow profile, although this depends on the tanks you decide to use. Scrubber. The Pelagian doesn't use a separate scrubber canister and is designed to be very compact. It holds about 2.8 kg of 4-8 mesh sorb and filling it is more involved than on the rEvo, but is not a difficult chore. Andy does have a longer scrubber that has an eight hour duration and still has the same diameter scrubber, which is small! The ability to use tanks up to 7.25" in diameter (Al80) makes using the longer duration canister an easy task. Gill - adding a radial scrubber canister would result in reduced sorb capacity due to the small size of the scrubber tube. I'm not sure how much benefit you could get with a lower capacity radial scrubber than a standard Pelagian scrubber. Needle Valve. I had reservations about the needle valve and how well it would work, but after having dived it I found it easy to adjust the flow to match my metabolic rate. I thought it was actually easier to dive the Pelagian because once you set the flow you don't have to manually add as often. The fact that it doesn't have a blocked first stage means you can take this deep without modifications. For those who still fear the needle valve - just don't use it and add O2 as you would any mCCR - its no different. But adjusting it on the fly is very simple and effective. Turning the needle valve completely down does not shut off the O2 flow, on the unit I tried, the flow at the lowest setting was about 0.1 lpm. Andy tests the flow with a flow meter to show this and also so you can know what your metabolic rate it. Its very easy to determine your metabolic rate at different work loads with this unit, just measure the flow coming out of the valve after setting it. Counterlungs. The front mounted counterlungs follow the shoulder straps of your harness (standard hogarthian routing) so they are to the side. I didn't find any issues with slinging an Al40, but access to the D-rings is diminished since the counterlungs are on top of the harness webbing. I'm not sure what it would be like slinging multiple bottles. I think side-mounting would be a good solution, but I did not try this. I did not find the counterlungs to be intrusive and the WOB was pretty good - no complaints here. There are two things the Pelagian counterlungs can do that I can't on my rEvo. First is the ability to remove water from the loop and the second thing is that you can do a positive test on the rig, something I am not able to do with the rEvo. Pelagian Display. I am used to the HUD on the rEvo, but diving without one was not a problem. The Pelagian display is quite small and light and was easy to see and keep out of the way. I was able to keep setpoint easily, especially after reaching my depth and adjusting the needle valve. I also liked that the Pelagian display uses a reed switch to turn on the display. The cable is also very durable and the display can hang off it without much worry ... although I'm sure this would not be recommended ... its much tougher than the audio cables used in other display applications. Head. The head of the Pelagian is very compact. It holds three cells, which need to be modified in order to fit the compact head, and to allow for the Instant Cell Validation. I had reservations about this as well. But it is VERY simple to do and will tell you how well your cells are working very quickly. However - you will have to do some math to know what the PPO2 should be at the depth you test your cells at, but its standard math that every diver has gone through many multiple times in courses ADV. I was not able to reach the ADV to manually activate it. But in the scenarios we discussed there were multiple options for flushing the loop. The ADV is sensitive in certain positions so the user must be aware of this - but you can take advantage of this to do a quick power flush of your entire loop. The ADV worked well in standard positions, but was more sensitive in a head-up position and face-up position. Position of Valves. I like having the valves up top. I find them to be much easier to reach then behind my back, especially with my wing inflated. It also puts more weight on top, which is one of the reasons for the great trim. CONCLUSION. I had the opportunity to not only dive the Pelagian, but went through preliminary Pelagian training with Andy. This gave me a great opportunity to learn a lot about the unit and Andy's philosophies. I think the Pelagian is a very solid unit with great characteristics. I would need more dives on it before I can make any final conclusions, but I truly do believe it is a great tool for diving. I'm hoping to be able to dive it more in the near future to see how well it fits into the diving I do. One thing that I can conclude is that Andy was able to dispel the reservations I had on the Pelagian. My only comparison is to the rEvo, which is a great rebreather. The Pelagian does have some things I like better, but the rEvo has things I like better than the Pelagian. So for now, the jury is out until more dives are done on the Pelagian. Also, I have to say that it was great to have Andy here in San Diego. He met most of the gang down here, had a chance to watch a local band, drink local beer, and eat good ol' American food Paul (BTW - I have some pictures of Tyler modeling the Pelagian ... I'll post those later this week) __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°>
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19th May 2008, 04:56	#20 (permalink)
Rebreatherlab RebreatherWorld Sponsor Current Rebreather/s: Pelagian Other Rebreather/s: Not Bought Yet Classic Kiss Pelagian Join Date: Sep 2005 Location: Thailand Posts: 193	Re: Tried the Pelagian.... Hi Gill, Just start with a lower Po2 and you will not have any spiking. I typically start with pure O2, go to 20 ft, check cell liniarity, flush down to 0,6 or so and then just bomb down. Usually this puts me at 1,2 when reaching 160 ft. As we are talking fast descents you really dont have to worry about the short exposure below set point. If I do a deeper dive with a slow descent and feel it would be nice to stay closer to set point during the descent I simply close the needle and metabolise some of the O2 on the way. depending on gas selection, depth and descent time this can actually work quite good. Andy Quote: (Originally Posted by Gill Envy) hey Tyler, I've only done a few deepish dives in a range that i'd expect air dill not to drop my po2 adequately. Certainly going deeper than 200 will require hypoxic dill and trimix. Getting all the added certifcation may turn out to be of limited value to me though since the places i'd like to do long deep dives are on reefs that are so remote that getting anything other than compressed o2 and air is problematic... but that's really a subject for another post. What attracts me to the needle valve on the Pelatian is that it sounds like a great way to tweek the o2 flow to match changing needs. Rapid descents were just one area I would find this convenient. I have my IP set to deliver just under my metabolic rate so that I hardly have to inject at all while at a constant depth, the downside to that is that it rises above 1.3 when i'm descending quickly even with adding dilluent. While that only happens for a short time, and i'm told many folks with eCCR's experience this as well, it would still be nice to have more control of... and then there is the advantage of removing the whole depth limit thing altogether. Mod 2 and 3 are likely an inevitability and I guess i'm mostly looking down the road, for to the configuration in mCCR I will likely want so that I can make most of the big changes now and grow accustom to them before adding all the other additional complexity of multiple gas mixes and so on. g __________________ www.rebreatherlab.com
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