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MikeFerrara:
For those who haven't dived this way I'll add though that you can't count on having good vis through the whole dive no matter how good it is. You need to have a safety reel/spool and know how to use it. If that's not the case then you should have a teather like most ice divers use.

The bottom is solid rocks mostly.. viz cant really go bad even then you cant miss the only opening of light coming in

But i do agree with you that you could and should run a line down to the plane

And we do always carry a reel and some spools
 
JamesP:
LOL back to you. I have been on a dive where the dude's Poseidon’s did fail. There was just about nothing there to breathe. There was no way he could get to his gas. This is a real life example. The regs were nothing but a liability on the dive and we do not use them for that reason. If you have something constructive to add please do, but shelf your Sinicism. It does not wash will me.

I should add that I have also had a diver with poseidon's loose his second stage due to a little stone jammed in front of the diaphragm. He could not clear it either in the water or back on the boat. I have gone for deco gas and had my second stage flood. I was able to easily and quickly remedy the situation, simply by removing and clearing the diaphragm. I was neither a burdon on the teams resources nor in danger of omitting deco or slidding back on the deco curve relative to the rest of the team. Equipment selection does have an impact on the dives.
 
Tom R:
not being a reg tech but, Isn't a Cyclone an upstream reg?

Tom

I believe that the cyclone X-stream doesn't close down on failure. Maybe Kevin could detail this one
 
Inspiration rebreathers have an integrated bailout system similar to an Air 2. Bailout not required.
 
JamesP:
LOL back to you. I have been on a dive where the dude's Poseidon’s did fail. There was just about nothing there to breathe. There was no way he could get to his gas. This is a real life example. The regs were nothing but a liability on the dive and we do not use them for that reason. If you have something constructive to add please do, but shelf your Sinicism. It does not wash will me.

What do you mean by sinicism? I don't see a big difference between having the reg shut off when you are going to respont to a free flow by shutting down that post anyway. What am I missing?

I should add that I have also had a diver with poseidon's loose his second stage due to a little stone jammed in front of the diaphragm. He could not clear it either in the water or back on the boat. I have gone for deco gas and had my second stage flood. I was able to easily and quickly remedy the situation, simply by removing and clearing the diaphragm. I was neither a burdon on the teams resources nor in danger of omitting deco or slidding back on the deco curve relative to the rest of the team. Equipment selection does have an impact on the dives.

I also prefer a reg that I can open up in the water.
 
JamesP:
Dave

I am not sure what is twisting your shorts.

LOL... Figure of speech, that's all....

I think Mike said it best when he pointed out that on a set of twins, you simple shut it down and move to the backup reg. In all honesty, I don't go strickly all poseidon as on my backup I have a hybrid of poseidon first stage with a tX100 second and that's on the necklace under my chin. As for little things getting stuck in the diaphram, true, Odins aren't as easy to unclog underwater as others but it can be done as I've done it when I screwed up and did a face plant in the mud in Barrie. However, I do find them a easier breathing reg. once they've been setup.

I can see we're going to have some fun this summer
 
JamesP:
Tom

I believe that the cyclone X-stream doesn't close down on failure. Maybe Kevin could detail this one


You do realize that those are two different regs??? right???

And oh... the cyclone you can access the diaphram underwater for easy cleaning in the case of stones getting stuck. Just leave the little clip off the back of the "hockey puck" that allows the external case to slip back.
 
Nothing is perfect...You have to look at both sides of things and then make the decision for yourself. I have had Poseidon's shut down on me...I have also had sand in the dia cause probs by giving me a nice mouthfull of water with each breath of Air I took in. I also had an Ice Dive at Rockport Thumbed just a month ago by DS1 because his APEX were both Frozen Open. I have seen a Scubapro 2nd Stange just fall apart on descent. It's all good gear...keep in maintained and it will work for you... We just have to remember that Stuff can and does happen. We are all people that love diving and it would be great if we could keep focused on that a little more often... Have a great weekend to all...Save and Happy Diving
 
Silverback:
You do realize that those are two different regs??? right???

And oh... the cyclone you can access the diaphram underwater for easy cleaning in the case of stones getting stuck. Just leave the little clip off the back of the "hockey puck" that allows the external case to slip back.

Cliff at Limestone just posted some specs to me in a pm. I asked him to post it to the thread. What he has to say is very interesting.

And no I didn't realize that the Cyklon and X-stream are to completly different regs. I thought that the x stream was a next generation design. That is why I ask Kevin to detail the differences. As far as I am concerned they all belong in the same pile of things that don't work. Poseidon can around to our way of thinking way to late in the game. We do not use them. We have seen them fail in the worst way. They present more of a liability then a benefit. You folks can beat this one to death. Upstream valves still present a serious safety concern. I will not get in the water with anyone using them.

Question: When do you know when an upstream valve has let you down?

Question: When do you know that a downstream valve has let you down?

Answer: When you need to take your next breath. I can still breathe a freeflow. I can't breathe a shut down 1st stage.
 

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