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divelermentov · 17th April 2008, 00:19

Quote: (Originally Posted by Packhorse)

It just sounds overly complicated to me.
If you are worried about a CMF system not flowing enough at your max depth then find a reg that can deliver a higher fixed IP. I hear there is a aftermarket Apeks spring that will deliever 20 bar. That will give you a CMF to 100 meters and even to 120meters the flow will be fairly close.

as I understand Alex does not simply want to KISS a eCCR, it is easier to ny a mCCR but instead does want to convert an eCCR into a hybrid such as the rEvoII.

well the problem with building a hybrid breather here is that some eCCRs require a certain IP to be able to work the solenoide, for example the inspo wants an IP for 7.5 bar.

this is pretty low for a mCCR, if you crank the IP up the solenoide might not open anymore as it has to be pushed open against the pressure.

furthermore the gas flow thru the solenoide will cease pretty quickly as well. (edited: if you change the 1st to non-depth compensationg, depending on your ip, as soon as the ip is less than 6.5 over ambient, the solenoide will not be able to deliver 12 lpm flow, which is regarded as a requirement for eCCR for the ascend phase - however as you have a constant flow at the same time you migth get away with less, but thsi is pretty unclear if you do or not !!)

So effectively this will hinder your ability to use the inspos first stage for a hybrid. (edited: which willmostelikely apply to all other eCCRS, except the rEvoII, i think the difference is that the rEvos solenoide can deliver more flow at lower pressure, but again will have to ask Paul on that)

I don't know how they have solved this in the rEvo II, Paul might be able to share some light with this regards. Howver as i understand you will only be able to use the rEvo hybrid to a certain depth before you have to convert to a pure eCCR.

as i dont know the ip requirements of other eCCRs these might be easier to convert than the inspiration.

I think the real advanteg of the hybrid comes in if you were able to use the mCCr to its max depth and when you go deeper just run it eCCR, and when you ascend let the mCCr kick in again. But as i see this you will need two 1st stages for that.

Paul please correct me if I got the rEvoII's concept wrong.

Cheers
c

17th April 2008, 00:19	#13 (permalink)
divelermentov Nutty dentist - uwdriller Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: Auckland Posts: 637	Re: O2 addition methods Quote: (Originally Posted by Packhorse) It just sounds overly complicated to me. If you are worried about a CMF system not flowing enough at your max depth then find a reg that can deliver a higher fixed IP. I hear there is a aftermarket Apeks spring that will deliever 20 bar. That will give you a CMF to 100 meters and even to 120meters the flow will be fairly close. as I understand Alex does not simply want to KISS a eCCR, it is easier to ny a mCCR but instead does want to convert an eCCR into a hybrid such as the rEvoII. well the problem with building a hybrid breather here is that some eCCRs require a certain IP to be able to work the solenoide, for example the inspo wants an IP for 7.5 bar. this is pretty low for a mCCR, if you crank the IP up the solenoide might not open anymore as it has to be pushed open against the pressure. furthermore the gas flow thru the solenoide will cease pretty quickly as well. (edited: if you change the 1st to non-depth compensationg, depending on your ip, as soon as the ip is less than 6.5 over ambient, the solenoide will not be able to deliver 12 lpm flow, which is regarded as a requirement for eCCR for the ascend phase - however as you have a constant flow at the same time you migth get away with less, but thsi is pretty unclear if you do or not !!) So effectively this will hinder your ability to use the inspos first stage for a hybrid. (edited: which willmostelikely apply to all other eCCRS, except the rEvoII, i think the difference is that the rEvos solenoide can deliver more flow at lower pressure, but again will have to ask Paul on that) I don't know how they have solved this in the rEvo II, Paul might be able to share some light with this regards. Howver as i understand you will only be able to use the rEvo hybrid to a certain depth before you have to convert to a pure eCCR. as i dont know the ip requirements of other eCCRs these might be easier to convert than the inspiration. I think the real advanteg of the hybrid comes in if you were able to use the mCCr to its max depth and when you go deeper just run it eCCR, and when you ascend let the mCCr kick in again. But as i see this you will need two 1st stages for that. Paul please correct me if I got the rEvoII's concept wrong. Cheers c __________________ May The Sorb Be With You Last edited by divelermentov : 18th April 2008 at 04:53.
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