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Yes, this. To me, this sums up what to know about what is priority for the "journalist". I find it personally offensive to consider that the voice of a sensationalist hack could stand as representative to the world at large for a community I identify with. I know there's plenty out there these...

It's getting more and more tricky to go someplace I can feel young. I just want you guys to know I really appreciate you. A lot. ;-)

The documentary is your brainchild. How is establishing your credibility as a journalist not on topic? Also as John pointed out, you have the duty to disclose any conflicts of interest. That's not for someone else to "do their own legwork".

Well that was a blast from the past-- thanks for the reminder of how much I miss the thoughts and musings of gianaameri.

I've used a diaphragm regulator from the beginning with 100% O2.

Gotcha, there's my ignorance of the application front and center. That Jan Willem Bech article is pretty awesome, he went over and above writing that. I'm gonna pipe down now, since even though your original question clearly stated choked flow, I went right into talk of changing delta P's and...

Good point, agreed.

Yes, very much so. The more you open it, the larger the orifice will get until it hits the maximum. Cv is a measure of flow capacity, so the bigger the orifice then the more flow that can pass. The calculation I mentioned above is easy to use for a fixed round orifice. It can be manipulated...

Nice article. This chart looks helpful: One form for a back-of-the-envelope calculation I use for Cv estimation is Cv=23.6*D² Where D is the orifice diameter in inches. That would get you a number to use for the 4th bullet in the example.

What are the formulas?

Do you have any predictions for how regulations might change the experience, from the diver's perspective? Fewer operators? Higher expense? Less death?

Divers sucked by whirlpool, says Fire and Rescue Dept D-G

I am not able to process this. There has just got to be some extremely important detail left out of the story, this is just unthinkable.

The apparent answer is yes. CNS toxicity in closed-circuit oxygen diving: symptoms reported from 2527 dives. - Abstract - Europe PMC Oxygen Seizures at PO2 ≤ 1.6 Bar: How Rare? - Shearwater Research Can only get to the abstract of the original IDF report without paying, but there were cases in...

I agree with what you're saying, but I also sympathize with the hypothetical someone who's ticking off the thing as a possible tox. As you pointed out, the cost of getting this wrong is drastic. To those in this thread I've addressed or quoted- I'll try to be clear about my own beliefs. Not...

I didn't though... as sometimes happens on the internet, I plowed on ahead with saying what was on my mind :wink: Here's what I'll say for myself, not speaking on anyone else's behalf: Here's an essay from Shearwater on the subject. It cites an Israeli study that logged probable CNS toxicity...

Not to answer for anyone who can answer for themselves, but I believe you are misunderstanding rjack321's statement. I don't believe he's trying to say that most people tox at PO2 1.6 The way I read the statement, he is only saying that it has happened... nothing about the frequency. I have no...

Allow me to personally welcome you to speak your mind any 'ole time you feel like it-- --Edit: just caught that the avatar's your wife... false advertising sir! Still interested in your thoughts, just much, much less ;)

It could be I misunderstood. I did tune out right quick so I guess there's a chance I didn't give him a fair shake.

I probably would have a little more interest if he'd started his story saying "here's how bad I suck, glad I learned something" I'm only a so-so cave diver myself but I do know a few who'd probably rank as super. When someone starts out a story reassuring me of their super-ness, it is just...