Prism2 vs rEvo?

[tbone1004]

Dude, you need to stop.

Anyone with $30 can dive a byrillium spring.

Tec Equipment für Nitrox, Rebreather Höhlen Tauchen

Part #T0200A.

I had one in my KISS.

thanks, didn't know they were available again, good to know. Was out of stock last time I checked.

remove the depth limiting comment then

 

[lv2dive]

I don't know @kensuf - hard for me to take you seriously with "only" 400 or so hours on CCR!!!!

It would be interesting to add a profile field for number of hours on CCR... might add context to a lot of these conversations/advice.

 

[kensuf]

Also, thank you to you and @tbone1004 for the back-and-forth discussion. I think I'm generally following it and "pickin' up what you're puttin' down."

I definitely appreciate what you said about flying an eCCR manually and using the controller setpoint as a parachute. That definitely makes sense. It seems like a skill that you would actually HAVE to use if your controller died and you only had a backup Shearwater with O2 sensor readouts but that was not a controller. So, developing that skill by flying the unit that way as a normal practice doesn't sound like it has a downside.

I don't know yet whether my shop delivers and trains the rEvo as an eCCR or hCCR. I'm pretty sure it's not an mCCR. I guess I'll find out pretty soon!

I'd be curious to see what they show you in terms of a Revo. As I said, to the best of my knowledge, the Revo only comes in a hybrid or an mCCR format. I've also heard that the manufacturer is very particular about who can teach the unit and allowing the unit to be modified, so it is unlikely that your instructor will be able to use a non-stock unit.

Have a great weekend, I've got my CCR packed for a 3 hour dive tomorrow.

Ken

 

[kensuf]

I don't know @kensuf - hard for me to take you seriously with "only" 400 or so hours on CCR!!!!

It would be interesting to add a profile field for number of hours on CCR... might add context to a lot of these conversations/advice.

As I said, I'm just a newb on the CCR. My peers that I listen to have quite a few more hours than me.

OK everyone, tell us how many hours you have on a CCR and what models you're trained on. Try dives do not count as training dives.

I'm trained on the SF2 and KISS Classic (plus the KISS Sidekick).

 

[tbone1004]

About a 10th of what you have with most on a homebuilt and as such no formal training. obviously nowhere near as much as you, but I've been waiting for a unit that I'm happy with in sidemount for cave diving. Still hasn't happened yet so I'm holding off on making that move. Hence the genuine questions sent towards you on why you have an aversion to hCCR. Especially on why you are OK with making adjustments on a needle valve based on workload, but not OK with making those adjustments with changes in depth.

that said, the math that I posted on the needle valve flow is not wrong *though obviously adjusted to "close enough" percentages for sake of conversation* and is basic physics which come from an engineering degree with several courses in fluid dynamics. I'm quite qualified to speak on that subject.

 

[stuartv]

I don't know @kensuf - hard for me to take you seriously with "only" 400 or so hours on CCR!!!!

I was thinking the same thing! [/sarcasm]

 

[kensuf]

I was thinking the same thing! [/sarcasm]

@stuartv , here's the thing. I consider myself a neophyte compared to most of my friends and mentors. One of them has literally thousands and thousands of hours on different CCR's and has been diving a CCR since the mid-90s. I've been blessed with the opportunity to learn from these guys, and there are several tips I've picked up from them that have made me a better rebreather diver.

I am still learning and I continue to learn new stuff all the time; at 200 hours on a unit I nearly killed myself doing something I hadn't thought would be a problem. At 400 hours on CCR, I feel more confident that I'm not going to die anytime soon, but I have a much deeper respect for these machines and am extremely vigilant with them.

At the same time, I will openly admit what I don't know, such as the hCCR -vs- eCCR thing on the Revo.

Unfortunately, sometimes it's difficult to really get an idea of a persons true knowledge and experience based on what they post on the internet. The certification requirements for CCR Air Dil include 600 minutes of dive time (580 for one agency, 600 for another). Basically, that means anyone with only 10 hours on any CCR may have completed a course but probably does not have much independent experience without direct supervision of an instructor to draw and make recommendations.

 

[tbone1004]

@kensuf still trying to understand this and not trying to be an ass because there is likely something I'm missing.

Are the guys on the Fathom using the needle with a blocked first stage or with a normal one?

If blocked, why are they OK with adjusting the needle based on workload but are not ok with adjusting it based on depth and workload? The same risks exist with either scenario in terms of accidental adjustment, over adjustment, and failure.

 

[stuartv]

@stuartv , here's the thing. I consider myself a neophyte compared to most of my friends and mentors. One of them has literally thousands and thousands of hours on different CCR's and has been diving a CCR since the mid-90s. I've been blessed with the opportunity to learn from these guys, and there are several tips I've picked up from them that have made me a better rebreather diver..

I totally get it. But, it did make me chuckle when I read your earlier post. You may know people that are WAY more experienced than you. But, you are still one of the most knowledgeable and experienced CCR divers I have an opportunity to "talk" to. And you certainly are experienced and knowledgeable enough to offer VERY respectable insights and opinions.

I appreciate the time you take to respond to true newbs like me!

 

[lv2dive]

@stuartv -

I don't log my dives/hours (Bad, Kate!) - I stopped when I hit a 100 on the meg (and I don't have quite that many on the SF2). So I I'm definitely a newbie, although not the novice I was when I started down this path three or four years ago.

Ken and I are lucky to know people with years or even decades of experience on CCR to bounce thoughts / ideas off of - it's a great resource. Speaking from my own experience only:

Even though most people acknowledge / recognize they are neophytes when they are new, until somewhere around 100 hours on a CCR, most people don't understand what that means. Tthey don't know how much they don't know. But, by the time they hit around 100 hours, and the SHTF a couple/few times, it's easier to accept (internalize?) their ignorance and realize how much more they have to learn.

I know for me, the more hours I "logged," the more I realized I had to learn. Just something to keep in mind as you solicit feedback in the real world and elsewhere.

I've gotten great training from people who are "walking the walk" (doing the dives) and the consistent advice I got from the best instructors, was always, "now go dive your face off" (maybe not those words exactly but you get the idea. )

Good luck in your endeavors!