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Voting logic doesn't make sense to me. It seems like most rebreathers that use 3 cells (or more, some can take a ridiculous amount of cells) and employ "voting logic" if they use a solenoid. From what I understand, voting logic finds the two cells that are most alike and then averages them...

I think I have a pretty good handle on how constant mass flow using an orifice works, which is why I'm posing the question, but if I am wrong about any of this please correct me. I have taken several classes related to fluid flow, I started off studying Chemical Engineering and switched to...

I am not a rebreather diver. I don't own one and have never piloted one. However, I am fascinated by the mechanics of different rebreathers. Of particular interest to me are hCCRs like the rEvo when configured as such. I have a question regarding the constant mass flow of oxygen into the...

Currently, the OC Tec mode allows the user to specify an alternative data display to replace the NDL display in the bottom right. This is because once the NDL has been reached, the NDL display is useless and wasting space. I would like to point out that the deco stop displays (depth and time...

I recently got a Perdix and I love it. However, I have a question about the OC Tec layout. The NDL displayed in the bottom right can be customized to display other information once the NDL has been surpassed as it would otherwise waste screen space. But what about the stop time/depth in the...

This is why I don't understand SSI's policy. Even in this example video, look how uncomfortable the divers look in a controlled, stress free environment. Note that the donated regulator hose is stretched to its maximum length, and the recipient is already VERY close to the donor. They are so...

The point of this thread is to discuss a specific SSI standard that I personally take issue with. I am not attempting to enact any sort of "change" to SSI policy. I would not be so arrogant as to think that my limited diving experience makes me enough of an expert to determine what anyone...

What I gather from this thread is that a big reason why donating the primary is taught is because it is simply easier for the instructors. No matter what equipment the student is using, the instructors can teach one method of donation, and it will work. I would argue that donating the...

That seems a little unreasonable. First, let me re-state my question. Why does SSI advocate donating the primary regulator and then switching regulators rather than advocate donating the octopus immediately during air sharing with a standard 3' primary, 4' octo reg configuration? Second, when...

I would agree with you. After I got certified (a year ago) and after doing a few dives, I got my own BP/W and a long hose single tank DS4/XTX50. I did this after reading about places I wanted to see, and realizing I would need to get much more training to see a lot of them. So I started...

Before I say anything, I wont name the dive shop that certified me but I would like to commend them. They really did do an excellent job tailoring the class to the individual's needs and making sure that everyone is safe. My question is specifically derived from one exercise performed during...

I was certified by SSI a year ago and we were taught to manage this. In fact, disconnecting, orally inflating, then reconnecting the inflator hose was one of the eight primary skills that we practiced during every pool session. The only reason to ever disconnect this hose is in the situation...

At the end of a dive in the pool, I am nuetral at 500psi. I test this often as I use my time working in the pool to practice for OW dives. I don't usually stop at 500psi in the pool, as that is a huge amount of gas and tons of extra time that I can use for working. I would never consider this...

Split fins are to scuba like the largest cog on your front cassette is to biking. Some people make use of first gear a lot. When biking, I rarely leave my highest gear. I feel the same about SCUBA, and I like a fin that feels like I am using muscles and pushing a lot of water. Rapid...

If I strain to move my head back, I hit the regulator. I already adjusted the shoulder straps to drop the tank a little and I believe it is in the right position now. It is not too low. I am not over weighted in my current setup. With an almost empty AL-80, which is what I use when...

I have a hole in my eardrum approximately 1.5mm in diameter and currently have a slight infection. I may be stupid, everyone might laugh at me, and most will say to stay out of the water for a good long time. I do not believe this is an option for me, and I am going to try to get back in the...

My current setup consists of a steel backplate and doughnut style 25lb wing. I use weight pockets on the waist straps of the backplate harness so that I can travel and easily throw in a couple of lbs for salt water on the boat. In the pool, I use no additional weight, though I intend to wear a...

I am leaning towards the Poseidons right now but I still have two reservations about them. My favorite mouthpiece that I have used thus far is the C-Bite style mouthpiece (such as the one that comes standard on the XTX50). I have not been able to find one that would fit the Xstream, and have...

Thanks for all the help! I went with a steel backplate and harness from DGX. I ABSOLUTELY LOVE IT. I was tempted to go for a soft backplate that could be converted if I ever chose to go the sidemount route, but it costs about as much to convert a transpac to a nomad as it does to just...

I see nothing wrong with solo diving in a pool as long as you are already somewhat familiar with your equipment setup and there is a lifeguard on duty. I am a college student with approximately 20 logged "real" dives and I work a part time job maintaining the three pools here at the aquatics...