Meg C/L mod

tibby · 16th October 2007, 01:31

OK, so now that I have like 8 dives on my new Meg I decided I know everything and I should modify my counterlungs

Well, I think this sounds worse than it is but you'll be the judge

I basically removed all but the outer-middle stock velcro straps (which I use to hold backup lights) and attached 3/4" velcro strips along the straight edge on the inboard side of the C/Ls as seen in the photos.
The idea is to streamline by hiding the SPG hoses inside the velcro and at the same time reduce the C/L volume by some 25% or so. I dived it and the volume is large enough for well over a very deep breath starting with the lungs at ambient pressure (for my tidal volume).
Restricting C/L volume was one of my concerns as I did this so in a pinch all I would have to do is grab the SPGs and pull them up or forward and the velcro will split over its entire length releasing the C/Ls to their original volume. I hardly think this will be ever needed but who knows? The other solution to this is well known and consists of hard-stitching the inboard edges together but you can't use that space anymore (for SPG).
I have no idea if this has been already done before, I just figured others may benefit from this idea so here it is if you like it. I have no intention to sell this in any way, I just own a sewing machine and I'm not afraid to use it.
Cheers,
Tibby

Mixaddict · 16th October 2007, 01:48

Quote: (Originally Posted by tibby)

OK, so now that I have like 8 dives on my new Meg I decided I know everything and I should modify my counterlungs

Well, I think this sounds worse than it is but you'll be the judge

I basically removed all but the outer-middle stock velcro straps (which I use to hold backup lights) and attached 3/4" velcro strips along the straight edge on the inboard side of the C/Ls as seen in the photos.
The idea is to streamline by hiding the SPG hoses inside the velcro and at the same time reduce the C/L volume by some 25% or so. I dived it and the volume is large enough for well over a very deep breath starting with the lungs at ambient pressure (for my tidal volume).
Restricting C/L volume was one of my concerns as I did this so in a pinch all I would have to do is grab the SPGs and pull them up or forward and the velcro will split over its entire length releasing the C/Ls to their original volume. I hardly think this will be ever needed but who knows? The other solution to this is well known and consists of hard-stitching the inboard edges together but you can't use that space anymore (for SPG).
I have no idea if this has been already done before, I just figured others may benefit from this idea so here it is if you like it. I have no intention to sell this in any way, I just own a sewing machine and I'm not afraid to use it.
Cheers,
Tibby

This is coming from a guy that sews his own wings and drysuit undergarments!

tibby · 16th October 2007, 02:47

Quote: (Originally Posted by Mixaddict)

This is coming from a guy that sews his own wings and drysuit undergarments!

Hey, whatever gets me in the water, right? I'll have you know that I have retired my homemade wing a while ago although it has never failed me.

**wedivebc** · 16th October 2007, 04:00

Nice looking mod Tibby. Personally I tuck my spg hoses in the pocket formed by the back of the CL and let them hang out the bottom but you way looks pretty neat. Be careful about make CL volume too low. I had a friend run out of diluent on a 200ft dive after sewing his CLs down along the seem. I believe he has let them out some now.

tibby · 16th October 2007, 13:55

Thanks Dave! Yes, I was concerned about that too and decided not to go the direct stitching route. The overlap of the velcro is about 3/4" so it doesn't "close" the entire inside "bellows" as the direct stitching would. I believe that allows plenty of left over volume for my size but I'll try to be prudent and watch my diluent use.
The 200ft dives will come later, for now I'll just focus on the breathing part

Tibby
PS: Hey, I noticed that was your 1000nd post, so did you get like a virtual cookie or something from Stuart?

**Fun Under Pressure** · 16th October 2007, 19:09

Looks god.

Cheers Markku

zoo_diver · 16th October 2007, 23:41

Looks nice! Don't let those guys bag on you too hard -- I make alot of my own stuff too.

**wedivebc** · 16th October 2007, 23:54

Quote: (Originally Posted by tibby)

PS: Hey, I noticed that was your 1000nd post, so did you get like a virtual cookie or something from Stuart?

Damn that was going to be my last post, now look what you made me do

16th October 2007, 01:48	#2 (permalink)
Mixaddict Always Learning! Current Rebreather/s: Inspiration Vision Evolution Other CCR Dolphin Other Rebreather/s: Inspiration Classic Other CCR Dolphin Join Date: Jan 2006 Location: Draper, Utah USA Posts: 426	Re: Meg C/L mod Quote: (Originally Posted by tibby) OK, so now that I have like 8 dives on my new Meg I decided I know everything and I should modify my counterlungs Well, I think this sounds worse than it is but you'll be the judge I basically removed all but the outer-middle stock velcro straps (which I use to hold backup lights) and attached 3/4" velcro strips along the straight edge on the inboard side of the C/Ls as seen in the photos. The idea is to streamline by hiding the SPG hoses inside the velcro and at the same time reduce the C/L volume by some 25% or so. I dived it and the volume is large enough for well over a very deep breath starting with the lungs at ambient pressure (for my tidal volume). Restricting C/L volume was one of my concerns as I did this so in a pinch all I would have to do is grab the SPGs and pull them up or forward and the velcro will split over its entire length releasing the C/Ls to their original volume. I hardly think this will be ever needed but who knows? The other solution to this is well known and consists of hard-stitching the inboard edges together but you can't use that space anymore (for SPG). I have no idea if this has been already done before, I just figured others may benefit from this idea so here it is if you like it. I have no intention to sell this in any way, I just own a sewing machine and I'm not afraid to use it. Cheers, Tibby This is coming from a guy that sews his own wings and drysuit undergarments! __________________ Randy Thornton (MixAddict) Inspiration, Evolution,Hammerhead & Sentinel CCR Instructor
(Online)

16th October 2007, 02:47	#3 (permalink)
tibby untitled Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: May 2007 Location: Salt Lake City, UT Posts: 336	Re: Meg C/L mod Quote: (Originally Posted by Mixaddict) This is coming from a guy that sews his own wings and drysuit undergarments! Hey, whatever gets me in the water, right? I'll have you know that I have retired my homemade wing a while ago although it has never failed me. __________________ Does the voice of reason change when you add helium to the mix?...hmm
(Offline)

16th October 2007, 04:00	#4 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,358	Re: Meg C/L mod Nice looking mod Tibby. Personally I tuck my spg hoses in the pocket formed by the back of the CL and let them hang out the bottom but you way looks pretty neat. Be careful about make CL volume too low. I had a friend run out of diluent on a 200ft dive after sewing his CLs down along the seem. I believe he has let them out some now. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Offline)

16th October 2007, 13:55	#5 (permalink)
tibby untitled Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: May 2007 Location: Salt Lake City, UT Posts: 336	Re: Meg C/L mod Thanks Dave! Yes, I was concerned about that too and decided not to go the direct stitching route. The overlap of the velcro is about 3/4" so it doesn't "close" the entire inside "bellows" as the direct stitching would. I believe that allows plenty of left over volume for my size but I'll try to be prudent and watch my diluent use. The 200ft dives will come later, for now I'll just focus on the breathing part Tibby PS: Hey, I noticed that was your 1000nd post, so did you get like a virtual cookie or something from Stuart? __________________ Does the voice of reason change when you add helium to the mix?...hmm
(Offline)

16th October 2007, 19:09	#6 (permalink)
Fun Under Pressure Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Nov 2006 Location: Germany Posts: 594	Re: Meg C/L mod Looks god. Cheers Markku
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16th October 2007, 23:41	#7 (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: 248	Re: Meg C/L mod Looks nice! Don't let those guys bag on you too hard -- I make alot of my own stuff too.
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16th October 2007, 23:54	#8 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,358	Re: Meg C/L mod Quote: (Originally Posted by tibby) PS: Hey, I noticed that was your 1000nd post, so did you get like a virtual cookie or something from Stuart? Damn that was going to be my last post, now look what you made me do __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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