newbie seeks advice.

**Freef** · 24th October 2007, 17:42

Quote: (Originally Posted by Flup)

Like mentioned above, bail out will be closely the same for all the systems. And if you play around a little with your SCR (don't try this at home people

), then you can gain a few advantages to OC. Put your bail-out/deco-gas on the loop (I do that with a minor modification) so you gain lot's of gas duration. Also it enables you to push the 40 mtr limit (watch it, no deeper then 75 mtr's on a dolphin). You go in on deco-gas, on depth switch to your 'bottom-gas' (which has a lower pO2, even trimix if you want to) and out you do it backwards. But like said, don't try this at home, your not diving factory-standard any more.

81m on the Dolph before the flow goes subsonic

. With respect to bailout gas, that's what it's for-not using on the loop. I wouldn't mix useages with bailout and on loop deco gas, and if you planned to carry enough bailout to get out safely then the extra plumbing to stay on the loop isn't really worth it.

With gas switching on the loop [travel-bottom-deco] you have a delay until the gas reaches the pO2/fO2 you are aiming for, and in a nipples skywards situation the last thing you need is the extra task loading with turning tanks off and on and loop flushing-it's easier to dump the loop and go OC.

Quote: (Originally Posted by Flup)

Correct, but stil there are a number of people who do this on a kind of regular base (like me said the madman

) In the ol' days (OC time) I pushed the Ressel once for about 1000 mtr. Was a very nice dive, with a lot of heavy gear to carry around.

Was scootering, so diving the rules of 5-th. (one of the reasons for me to switch to CCR).

That's the sort of use that CCR's are best for. Long penetrations where OC kit takes up a lot of space-and uses a lot of gas. 1000m? Bugger that!

Quote: (Originally Posted by Flup)

Sorry, will try to stay out next time

PS: http://www.rebreatherworld.com/semi-...ix-diving.html I hope to be getting the first trial dive in on halloween.

Good, or I'll swap your scrubber for real kitty litter

. Don't mess with the SCR 'massiv'.

Flup · 25th October 2007, 06:29

Don't kitty litter my breather, but...............

Quote: (Originally Posted by Freef)

81m on the Dolph before the flow goes subsonic

. With respect to bailout gas, that's what it's for-not using on the loop. I wouldn't mix useages with bailout and on loop deco gas, and if you planned to carry enough bailout to get out safely then the extra plumbing to stay on the loop isn't really worth it.

For the bail out I have to agree with you (d*mn, I don't like to say so

), for deco gas, I think (read carefully I think) it's a good thing to stay on the loop, but then again, JMHO, I also do this when I'm on CCR, so why not on SCR. For the 81 mtr's you're correct, just try to build in a little margin, so that's why I say 75 mtr.

Quote:

With gas switching on the loop [travel-bottom-deco] you have a delay until the gas reaches the pO2/fO2 you are aiming for, and in a nipples skywards situation the last thing you need is the extra task loading with turning tanks off and on and loop flushing-it's easier to dump the loop and go OC.

You have a little delay indeed, but breating in through loop and out through nose, you will be amazed how fast you have reached that point. Personally I don't think it's more of a task loading then getting of the loop on to OC, the handlings are not (much) more. So when I can avoid it, I go with

Quote:

That's the sort of use that CCR's are best for. Long penetrations where OC kit takes up a lot of space-and uses a lot of gas. 1000m? Bugger that!

Treu, CCR gives more room for such things, however you need to carry sufficient Bail Out to make it out of the cave If anything goes wrong with the unit at your plannend turning point. (and don't forget the factor 'stress' which will come up then

)

Quote:

PS: http://www.rebreatherworld.com/semi-...ix-diving.html I hope to be getting the first trial dive in on halloween.

Good, or I'll swap your scrubber for real kitty litter

. Don't mess with the SCR 'massiv'.

Nice work the link you put up. If everthing goes right i'll be making the first Trimix Dive this weekend in Austria (mountain lakes) on the Dolphin, let's see how it behaves. Only the girl needs to get her ears straightened out, don't wanna go solo on that trip.

Clear water for all

Flup

**Freef** · 25th October 2007, 17:28

Bugger, now I have to agree with you!

Staying on the loop is preferable to OC where possible, but on CCR your gas is adjusting all the time for optimum deco. Seriously deep stuff may also involve a change in dil gas, but for most divers this will not be required.

On SCR you either have to do a few loop flushes to sort the gas out or use a slightly richer gas than you intended to make sure you were at the correct fO2 for deco.

I prefer to deco on OC [well, at the moment] as I know exactly what gas I am breathing. With the cold, maybe a bit of stress and an elevated vO2 your deco plan can be affected if you stay on the loop on SCR, although it's unlikely to be by too much, and you can pad to get away with it.

zoo_diver · 25th October 2007, 21:54

Quote: (Originally Posted by pete611)

I dive the dolphin with a SS backplate and Dive Rite Harness and a 100 lb lift wing.

Wow!!! 100lb wing! That's what I'm talking about...go big or go home!

//Back on topic//

Alot of good beta in this thread. Costs do vary and at first can be scary. But -- if being underwater is where you like to be, the summary is that a CCR extends your time and your cost/dive is significantly less than that on OC. Especially, when you move into mixed gases. If you do 150 dives a year (I think that was referenced above) on trimix, you will almost have bought a CCR.

Good luck and MEG the force be with you!

**Freef** · 26th October 2007, 16:34

Quote: (Originally Posted by zoo_diver)

Good luck and MEG the force be with you!

Subtle as a kick in the nadgers!

How much is a Meg again?

Flup · 1st November 2007, 14:59

Quote: (Originally Posted by Freef)

Subtle as a kick in the nadgers!

How much is a Meg again?

For the fun you get, way to cheap

**Freef** · 1st November 2007, 16:56

Quote: (Originally Posted by Flup)

For the fun you get, way to cheap

Like a 10 baht beer?

Flup · 1st November 2007, 19:40

Quote: (Originally Posted by Freef)

Like a 10 baht beer?

Nitrogen bothering you ????

**Freef** · 1st November 2007, 20:44

Quote: (Originally Posted by Flup)

Nitrogen bothering you ????

Ever wonder why it's twice the price of a 5 baht beer?

Flup · 2nd November 2007, 09:13

Quote: (Originally Posted by Freef)

Ever wonder why it's twice the price of a 5 baht beer?

No I didn't, just like to dive it

24th October 2007, 17:42	#11 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: newbie seeks advice. Quote: (Originally Posted by Flup) Like mentioned above, bail out will be closely the same for all the systems. And if you play around a little with your SCR (don't try this at home people ), then you can gain a few advantages to OC. Put your bail-out/deco-gas on the loop (I do that with a minor modification) so you gain lot's of gas duration. Also it enables you to push the 40 mtr limit (watch it, no deeper then 75 mtr's on a dolphin). You go in on deco-gas, on depth switch to your 'bottom-gas' (which has a lower pO2, even trimix if you want to) and out you do it backwards. But like said, don't try this at home, your not diving factory-standard any more. 81m on the Dolph before the flow goes subsonic . With respect to bailout gas, that's what it's for-not using on the loop. I wouldn't mix useages with bailout and on loop deco gas, and if you planned to carry enough bailout to get out safely then the extra plumbing to stay on the loop isn't really worth it. With gas switching on the loop [travel-bottom-deco] you have a delay until the gas reaches the pO2/fO2 you are aiming for, and in a nipples skywards situation the last thing you need is the extra task loading with turning tanks off and on and loop flushing-it's easier to dump the loop and go OC. Quote: (Originally Posted by Flup) Correct, but stil there are a number of people who do this on a kind of regular base (like me said the madman ) In the ol' days (OC time) I pushed the Ressel once for about 1000 mtr. Was a very nice dive, with a lot of heavy gear to carry around. Was scootering, so diving the rules of 5-th. (one of the reasons for me to switch to CCR). That's the sort of use that CCR's are best for. Long penetrations where OC kit takes up a lot of space-and uses a lot of gas. 1000m? Bugger that! Quote: (Originally Posted by Flup) Sorry, will try to stay out next time PS: http://www.rebreatherworld.com/semi-...ix-diving.html I hope to be getting the first trial dive in on halloween. Good, or I'll swap your scrubber for real kitty litter . Don't mess with the SCR 'massiv'. __________________ David. Currently owner of two differently sized ankles.
(Offline)

25th October 2007, 06:29	#12 (permalink)
Flup Custom Title Allowed! Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Inspiration Vision Ouroboros Dolphin Home Build Join Date: Apr 2006 Location: Netherlands Posts: 134	Re: newbie seeks advice. Don't kitty litter my breather, but............... Quote: (Originally Posted by Freef) 81m on the Dolph before the flow goes subsonic . With respect to bailout gas, that's what it's for-not using on the loop. I wouldn't mix useages with bailout and on loop deco gas, and if you planned to carry enough bailout to get out safely then the extra plumbing to stay on the loop isn't really worth it. For the bail out I have to agree with you (dmn, I don't like to say so ), for deco gas, I think (read carefully I think) it's a good thing to stay on the loop, but then again, JMHO, I also do this when I'm on CCR, so why not on SCR. For the 81 mtr's you're correct, just try to build in a little margin, so that's why I say 75 mtr. Quote:* With gas switching on the loop [travel-bottom-deco] you have a delay until the gas reaches the pO2/fO2 you are aiming for, and in a nipples skywards situation the last thing you need is the extra task loading with turning tanks off and on and loop flushing-it's easier to dump the loop and go OC. You have a little delay indeed, but breating in through loop and out through nose, you will be amazed how fast you have reached that point. Personally I don't think it's more of a task loading then getting of the loop on to OC, the handlings are not (much) more. So when I can avoid it, I go with Quote: That's the sort of use that CCR's are best for. Long penetrations where OC kit takes up a lot of space-and uses a lot of gas. 1000m? Bugger that! Treu, CCR gives more room for such things, however you need to carry sufficient Bail Out to make it out of the cave If anything goes wrong with the unit at your plannend turning point. (and don't forget the factor 'stress' which will come up then ) Quote: PS: http://www.rebreatherworld.com/semi-...ix-diving.html I hope to be getting the first trial dive in on halloween. Good, or I'll swap your scrubber for real kitty litter . Don't mess with the SCR 'massiv'. Nice work the link you put up. If everthing goes right i'll be making the first Trimix Dive this weekend in Austria (mountain lakes) on the Dolphin, let's see how it behaves. Only the girl needs to get her ears straightened out, don't wanna go solo on that trip. Clear water for all Flup __________________ They say i'm all mixed up, maybe that's why i like mixed gas diving !!!!
(Offline)

25th October 2007, 17:28	#13 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: newbie seeks advice. Bugger, now I have to agree with you! Staying on the loop is preferable to OC where possible, but on CCR your gas is adjusting all the time for optimum deco. Seriously deep stuff may also involve a change in dil gas, but for most divers this will not be required. On SCR you either have to do a few loop flushes to sort the gas out or use a slightly richer gas than you intended to make sure you were at the correct fO2 for deco. I prefer to deco on OC [well, at the moment] as I know exactly what gas I am breathing. With the cold, maybe a bit of stress and an elevated vO2 your deco plan can be affected if you stay on the loop on SCR, although it's unlikely to be by too much, and you can pad to get away with it. __________________ David. Currently owner of two differently sized ankles.
(Offline)

25th October 2007, 21:54	#14 (permalink)
zoo_diver Is it snack time yet? Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Megalodon Join Date: Jun 2007 Location: Suffolk, VA Posts: 271	Re: newbie seeks advice. Quote: (Originally Posted by pete611) I dive the dolphin with a SS backplate and Dive Rite Harness and a 100 lb lift wing. Wow!!! 100lb wing! That's what I'm talking about...go big or go home! //Back on topic// Alot of good beta in this thread. Costs do vary and at first can be scary. But -- if being underwater is where you like to be, the summary is that a CCR extends your time and your cost/dive is significantly less than that on OC. Especially, when you move into mixed gases. If you do 150 dives a year (I think that was referenced above) on trimix, you will almost have bought a CCR. Good luck and *MEG* the force be with you!
(Offline)

26th October 2007, 16:34	#15 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: newbie seeks advice. Quote: (Originally Posted by zoo_diver) Good luck and *MEG* the force be with you! Subtle as a kick in the nadgers! How much is a Meg again? __________________ David. Currently owner of two differently sized ankles.
(Offline)

1st November 2007, 14:59	#16 (permalink)
Flup Custom Title Allowed! Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Inspiration Vision Ouroboros Dolphin Home Build Join Date: Apr 2006 Location: Netherlands Posts: 134	Re: newbie seeks advice. Quote: (Originally Posted by Freef) Subtle as a kick in the nadgers! How much is a Meg again? For the fun you get, way to cheap __________________ They say i'm all mixed up, maybe that's why i like mixed gas diving !!!!
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1st November 2007, 16:56	#17 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: newbie seeks advice. Quote: (Originally Posted by Flup) For the fun you get, way to cheap Like a 10 baht beer? __________________ David. Currently owner of two differently sized ankles.
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1st November 2007, 19:40	#18 (permalink)
Flup Custom Title Allowed! Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Inspiration Vision Ouroboros Dolphin Home Build Join Date: Apr 2006 Location: Netherlands Posts: 134	Re: newbie seeks advice. Quote: (Originally Posted by Freef) Like a 10 baht beer? Nitrogen bothering you ???? __________________ They say i'm all mixed up, maybe that's why i like mixed gas diving !!!!
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1st November 2007, 20:44	#19 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: newbie seeks advice. Quote: (Originally Posted by Flup) Nitrogen bothering you ???? Ever wonder why it's twice the price of a 5 baht beer? __________________ David. Currently owner of two differently sized ankles.
(Offline)

2nd November 2007, 09:13	#20 (permalink)
Flup Custom Title Allowed! Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Inspiration Vision Ouroboros Dolphin Home Build Join Date: Apr 2006 Location: Netherlands Posts: 134	Re: newbie seeks advice. Quote: (Originally Posted by Freef) Ever wonder why it's twice the price of a 5 baht beer? No I didn't, just like to dive it __________________ They say i'm all mixed up, maybe that's why i like mixed gas diving !!!!
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