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Good grief, you talk a lot of poop about what a person has said without bothering to read what they actually said. If you care to know what you're talking about before you go off: See post number 7. I encourage anyone to consider the case of the most negative rig they might dive, combined...

Nowhere did I say that personal buoyancy changes with depth. What I said is that a positively buoyant person can float on the surface with a smaller wing than a negatively buoyant person would need. I do not consider a 32lb wing to be "huge". I consider a 20lb wing to be small. I'm not...

That is definitely the most common reaction I get from non-divers. What's interesting is that lots of times that comes after I've told them I'm cave diving...

Fair 'nuff, and your opinion is noted. I remain unconvinced that the sky is quite so close to falling, so we'll have to part agreeing to disagree. Also clear?

You're not answering my question. She's diving fully within compliance of the limits of her certification. Do you have some specific beef with that?

She's diving within the limits of her certification, which she earned honestly I happen to know. What exactly do you know about her that you see fit to pass judgement that she's unqualified?

Other than the magic instantaneous loss of gas, and that sometimes I'm diving 130's instead of the smaller tanks, situation one above is exactly how it goes down when we dive together. I am quite comfortable with the level of conservatism on these dives. There's nothing about our conduct of...

It's an assumption on your part that I've just figured this out. My point is, a lot of the heat in arguments given seem to assume incompetence. Anyway, you guys are the divers, you're the one's who figured it out. ---------- Post added September 12th, 2013 at 02:16 PM ---------- Kotik's...

Ok, let's take a look at something: Situation 1: Kotik and his bride are diving a no-flow system. She is wearing a single HP 120. He is wearing two HP100's. All tanks are filled to their rated capacity. Both divers have exactly the same air consumption. They are diving to 1/3rd's As they...

I'm not trying to convince you or anyone else if a single tank with an H-valve is safe. I welcome you to do your own thinking and make your own decision about it. The discussion with AJ and James was merely to point out that the viewpoints on this matter are personal opinion only, not...

I can live with that answer. I do agree an H-valve is not the best way, that's pretty obvious. I also agree the data is inconclusive. That works both ways. For disclosure on my own stake here, in case anyone wonders: my dear wife happens to be intro certified, and it's not real likely she'll...

;) ... in the future too, I expect. Sheck was an unsafe guy, no doubt about it. He didn't just push envelopes, he created the envelopes and then burned them. There was of course every likelihood that the stuff he was doing would be the end of him someday. That was the direction he took...

So the alternative is "James or AJ say so, so Sheck was this unsafe guy who didn't know what he's talking about"? I am certain you guys are skilled, safe divers. Beyond that though there's nothing I know about you to establish your credibility in a way that I would discount what Sheck or an...

The NSS-CDS for one. Maybe the NACD as well, I'm not sure about that. My recollection of the history of this is: originally, there was no training progression in cave training, it was all done in one big lump, from what's now known as cavern through full cave. It was later recognized that the...

I guess what rankles me is: the OP posts a question "Can I do X". When OP gets a response that doing X may not be the most kosher thing, he brushes that aside. Seriously, why even ask the question then? The OP doesn't have a lick of cave training yet. A cave instructor is definitely going to...

Knock yourself out dude-- nice to see you're already beyond worrying about what an instructor might have to say.

So why ask the question if you've already decided the answer? If you already plan to ride an expired certification to dive two tanks by rationalizing the argument away, you might stop to consider how unforgiving this activity can be to corner-cutting. Remember, the first rule is training. Are...

You are very likely right on the money with that, so to speak :)

Well, speaking from my own perspective: I own one wing for diving singles, and I'm not at all inclined to buy a whole spectrum of wings, each of which is optimized to have just enough lift to suit a specific gear configuration and water salinity. If I were inclined to do that, then the first...

Not to be at all argumentative-- Wing size does depend on a lot of things, but there's one thing that can be said universally: a 32 pound wing can be deflated to have zero lift, but a 20 pound wing can never be inflated to have 32 pounds of lift. To me it's better to simplify problems when...