50 Fathom Downstream Nozzle Position

[SurfLung]

Sucked a Tank Dry with the 50 Fathom
- With all of the discussion about 50 Fathoms getting hard to breathe as the tank gets empty, I thought I'd suck a tank dry just to see how it performed.
- I had a tank with 500 psi left, hooked up the 50 Fathom, and swam around picking up sticks and sharp objects around the dock... Geez, 500 psi lasts a long time at 3 feet deep!
- I wasn't working hard but was having fun playing with the tank and regulator for 15-20 minutes before it finally ran out of air. I have to say I felt no difficulty breathing from this 50 Fathom right up until the tank went dry. Then, I got 5-10 very difficult breaths before the end.
- I just wanted to see for myself and I have no complaints on the 50 Fathom.

[frogman63]

I got the opportunity to purchase an old blue Voit 50 fathom this fall and this is what I found in terms of nozzle position. With some help from TSM, VDH, and Greg Barlow I was able to rebuild it and take it diving. I first set it up with the large hole aligned with the inhale horn. However, with the cans in the right position relative to the mouthpiece or if I took a deep breath, I would get an excessive blast of air. I was able to reproduce this back on the bench, so I changed it back to the small hole aligned with the inhale horn. In this configuration, I could not cause that excessive blast of air on the bench. I took it diving again and it breathed very consistent; no surprises. I then raised the lever height approximately 1/16 inch to reduce the cracking effort to around 1 inch at 2250 psi and took it diving a couple of more times. I did notice the change in effort required as the tank pressure dropped but it was a fun regulator to dive with. Thanks for all of the info that you guys have provided on this subject.
Brian

[Bryan]

Thanks Brian. I'm sure others will find this helpful when working on their 50 Fathom

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