BMCL for a Meg

jknox

After crawling through some small holes in a wreck last week, it has reknewed my interest for BMCL for my Meg. What options are out there that still have a working ADV.

I would prefer something along the DaveT lungs that I have seen DrMike(and Phi??) with or some other design without a hard case but am open to options...

I think simply turning around the lungs doesn't seem viable for manual addition of gases or the ADV but correct me if I am wrong...

Cheers

Drmike

You could plug the holes and turn the lungs around. You will need new manual add buttons anyway (i can make those for you)

Personally for best WOB I believe a hard case is better

Simplest solution maybe to change T pieces to inspiration so that gives you a T piece based ADV (can be used as manual add by pressing diaphram) so juist need one manual add O2 button (or can be used for both O2 and dil injection) and just turn the lungs around

If you want to make new CL (instead of using Meg ones) buy some Otlerb water bags from the Army market - they work well but you still need to sort out an ADV (personaly I went the inspo t piece adv way

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Steve

When you say "working ADV" do you mean reachable by the diver or actually working ADV? Working is easy and I'll send some pics to you when I'm on my other machine. (In a day or so)

What is the hard case going to add? I'm not following you here guys?

I have opted for a set of neoprene lungs for my next experiment that I'm waiting on some parts for. It will be a month before I can post pictures for that one.

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jknox

Hi Steve, I just get the feeling that using the "plunger" style Meg ADV would fire inadvertanly if it were between myself and the rebreather. That is why my thinking is leaning towards the AP type T-piece ADV, but I am open to other ideas...Maybe the old style Meg or any thing else based on a regulator and working via a vacuum.

By hard case, I am thinking like the KISS style BMCL or PaulC's BMCL for the inspo

Would love to see some pictures of your setup!

jknox

Why would that be? I though Alex D. mentioned before that the hardcase increases the hydrostatic resitience of the CL if most of the material wasn't cut away, thus increasing the WOB?


Thanks for the heads up on the water bags, I may go that route if I don't find an alternative solution.

louisrankin

I spoke to DaveT at the dive show about putting back mouted lungs on my Meg. He has designed some lungs that look like they are in a small wing, he then suggested using a YBOD ADV and have two manual add made for the Dil and 02. It may be worth contacting him I would be very interested in doing the same as imho this is the worst part of the Meg. I dived a Kiss for 4 years and then bought a Meg and I find the lungs a real pain in the arse.

Louis

jknox

Thanks Louis, this is exactly the setup I saw on DrMikes BOB and would love to get a set, but it was my understanding that DaveT no longer makes those...but definately I will contact him to verify. Had a KISS diver on the trip last weekend, and agree on the nice clean front!

dave t

Well, its not that I dont want to make the lungs, its just been very difficult to get someone to make them for me for lots of reasons. However I think I may have found someone, will know in a few days

Dave

Drmike

Steve, with the bmcl you can have the wing when its inflated, and your back pushing against the CLs, reducing available volume, plus even with normal OTS CLs when you breathe out you are having to 'move' the cl cover up and down (more loss) I have found a big difference in wob when the inner bags are totally free to move unrestricted inside their own case....I found neoprene covers to be even worse Imagine when you breathe out you are moving/lifting the neoprene, or whatever material the covers are made from. I can notice the difference so I suspect its quite high

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Drmike

you have to have plenty of holes to allow water to freely pass in and out (perforated plate?) but for reasoning see above.

bags are 12 bucks

Having said that best WOB with bmcl i have found to be when its still 'OTS', ie the T pieces are in same position as before. Most of breathing occurs at the top (ots) part so hard case in this method will only help a bit to ensure available max breath vol potential is retained in rest of Cls behind when wing fully inflated. Another way is to add a spacer so BP is pushed away from wing.

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Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you