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What is this 1995?21 is not a crazy hot dil for 60m.
35 ist not a low fraction of he. END is perfectly OK. I even dive 60m on air, OC and CCR.
Having seen some of his other threads (and this one), it seems that he hasn't gotten any ccr training but is self-taught by reading stuff on the internet. The O2 'strategy' really doesn't make much sense and neither does low He dil/high END/high gas desinty on a CCR, IMHO.I have no idea why the OP is bumping up the ppO2 shallow then adding a crazy hot dil with such a low fraction of helium.
Eventually it will. But slowly.No problem with that. Metabolism brings it down to 1.3
Bounce dives to 60m on OC is one thing (if you need it for your ego), I used to dive below 60 m on air too, but air dil on a ccr is just stupid. He dil is cheap. What's the point in using high density dil and diving completely hammered on a CCR? What's even the point in using a rebreather to begin with when you're doing deep dives on air? The whole story is weird.I even dive 60m on air, OC and CCR.
Nonsense, I got serious CCR training on 2 different rebreathers. I ve been diving CCR for 25 years. And I am more than willing to learn new stuff.Having seen some of his other threads (and this one), it seems that he hasn't gotten any ccr training but is self-taught by reading stuff on the internet.
Sounds good, no doubt. If I make a long dive (for ex cave) I have the CNS problem and will keep the pO2 lower. Or I take the risk of high CNS which in certain cases is OK as well. If I make a short dive CNS is not involved.Eventually it will. But slowly.
The current thinking is to keep the PPO2 lower for the deep portion of the dive for other reasons than just shortening decompression. Keeping the CNS+POT (pulmonary oxygen toxicity) down; CO2 hits apparently are worse or triggered by high PPO2; WOB (work of breathing) with a larger helium fraction.
But most importantly, having a lower diluent PPO2 means you can correct the loop should the crap hit the fan -- brain fart and inject too much O2; or the solenoid injects just as you descend to the bottom of the wreck; broken solenoid, leaky injector, etc.
Normaly I dive 21/35 from zero to about 60m. I only use air if 21/35 is not available. But then I use it without any problems at all.
Deeper than 60m is for 18/45, if available