Question Fathoms MK III

[Borebrush]

@211ratsbud whose counterlung are you using? I believe Fathoms stuff may be dimensionally unique to their design? The iqsub adv t’s I have seen did not have a water baffle. I have an older hammerhead adv t that is baffled and uses the guts off an apeks reg.

@inquis that looks like the product shot of an early iteration fathom unit…they may have used iqsub stuff then?

 

[inquis]

Interesting. The IQSub Ts are shown on the current website (for the Mk3) as well as the 2022 InDepth's Rebreather Holiday Shopper's Guide (for the Mk2.5) and the 2024 Guide (for the Mk3). That suggests to me that the website and Holiday Guide pics are all holdovers from a bygone era. FWIW, mine is a little over 3.5 yrs old (#59), and it does not have IQSub Ts. Nor does the unit shown in the Aug 2022 article Jon Kieren wrote for InDepth. <shrug> Hope it helps...

 

[Borebrush]

These are not from a Fathom unit. Only dropping this here for reference. All the iQsub adv t’s I’ve ever seen were not baffled.

 

[211ratsbud]

My net effect was if it has an ADV, then it in fact does not have a baffle on the exhale side t-piece.

I thought someone earlier had mentioned that their ADV had a baffle in it from fathom.

I'm not diving a fathom however I have fathom counter lungs with IQ sub ports from that era that I used briefly before switching to xccr lungs (better IMHO).

The fathom lungs have an opv which is not functional, I could blow the ports out of my counter lung before the opv would vent. I did replace a spring and dived it that way for a bit. But found the other lungs actually fit better. Not so wide at the shoulders.

If I told some of you how I was configured now I would get the naughty stick.

I did extensive research into the ADV versus no ADV hose plumbing, including coming across approximately three reports of the ADV diaphragms collapsing when using an inline shut off.

Most recently I did switch to a fathom dsv on my homemade rig.

Yes. At least on my version which has the adv but it is my understanding that it is present on the non-adv versions as well. Flood tolerance was one of the many things well thought out when Charlie built the fathom so I can’t imagine he didn’t leave the baffle when he chose to stop selling it with the adv as standard.



Edit: whops somehow I missed that inquis answered already

I took that to mean that you were saying the baffle existed in the Adv as equipped by fathom. My apologies if that's a misconstrued interpretation.

 

[inquis]

The fathom lungs have an opv which is not functional, I could blow the ports out of my counter lung before the opv would vent

Having left my O2 on after a dive before, I can totally believe that! I wonder if the OPV on the newer Fathom CLs is any better?

 

[Borebrush]

If I told some of you how I was configured now I would get the naughty stick.

You need to do a write up on your unit...I can only see so much from your crazy pics!

 

[rddvet]

My unit is number 18. It has iqsub elbows that have a baffle on the inhale side, not the adv exhale side. I believe I was told this was intentional. With no baffle on the exhale side you can push water thats in your loop into the lung and dump it by basically doing a dil flush, inflating the cl and pulling the dump. The baffle on the inhale side stops any water from coming back into your dsv/bov

 

[211ratsbud]

My unit is number 18. It has iqsub elbows that have a baffle on the inhale side, not the adv exhale side. I believe I was told this was intentional. With no baffle on the exhale side you can push water thats in your loop into the lung and dump it by basically doing a dil flush, inflating the cl and pulling the dump. The baffle on the inhale side stops any water from coming back into your dsv/bov

Interesting. I would expect there to intentionally be a baffle on the exhale side, where the cl dump is. *I would think* that gives you the highest probability of getting it out IMHO, versus having an un-hindered shot to the canister.

Many other factors and things to think about but to me that stands out, as something I need to think about more.

 

[rddvet]

Interesting. I would expect there to intentionally be a baffle on the exhale side, where the cl dump is. *I would think* that gives you the highest probability of getting it out IMHO, versus having an un-hindered shot to the canister.

Many other factors and things to think about but to me that stands out, as something I need to think about more.

Email fathom and ask them about it. I’m not 100% sure on the new units. I will say it is a nonissue. My wife flooded the hell out of her unit with zero caustic or water even coming up into the inhale side.
The flood was due to her adv diaphragm tearing badly, which is why adv’s aren’t on the new units. I was shocked the amount of water in her unit while not having any signs of a caustic

 

[Borebrush]

My unit is number 18. It has iqsub elbows that have a baffle on the inhale side, not the adv exhale side. I believe I was told this was intentional. With no baffle on the exhale side you can push water thats in your loop into the lung and dump it by basically doing a dil flush, inflating the cl and pulling the dump. The baffle on the inhale side stops any water from coming back into your dsv/bov

Do your T's have capped ports for injecting gas? Would you mind measuring the diameter of your T's where they plug into the CL's.