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Let's be clear here shall we, it's you telling people what to do, not me. You are the one being prescriptive in saying O2 is narcotic, and pointing to Meyer-Overton as a definitive "rule". I suggested that it's more complex than that, and that a cursory investigation will show a range of...

Actually, it's more a long-winded way of disagreeing with you;) I do not agree with your earlier statement that 'O2 is for all practical purposes narcotic'. I believe it is at best unproven; and I think the thread I linked to previously (How Narcotic Is Oxygen? - Rebreather World) gives a...

Forgive the hijack, but I figure we're done on the entry-level nitrox issue. (No doubt someone will prove me wrong!) This is a bit too definitive for my taste. My current view (though I'm very open to persuasion!) is: the jury is out on O2 narcosis Here's why: The Myers-Overton hypothesis is...

What's usual? TIA

The PADI instructor course consists of AI, OWSI (together, IDC), followed then by IE. Crossovers skip the AI and go straight to the OWSI program... 5 days minimum (3 if you do online study first). The IE is usually 2 days. Costs are obv up to the individual CD and divecenter, but budget...

Nice thought experiment. Tissue inert loading is a factor of both diffusion and perfusion. If the tissues are perfusion limited, then increasing diffusion will have negligible effect. This includes transfer across the alveolar interface. Mark Powell uses a useful analogy in 'Deco for...

Haemoglobin in arterial blood is normally around 97.5% saturated; venous blood around 75%. Increased inspiration rate is driven more strongly by the need to expire CO2 than it is to increase O2 to the alveolar interface and through the O2 cascade. Some computers include a heart rate monitor...

If they are 'identical divers' then yes, *theoretically* there is an increased risk of DCS... but for which diver? 1. Diver 1 was purposefully skip-breathing, shallow-breathing or otherwise artificially reducing gas usage (rather implausible over an entire dive, but let's presume it was...

Decompression theory is not an exact science. The simple truth is that unless and until you spend some time gaining experience and training beyond introductory level, you'd be well advised to either treat your dives as square profile (or multilevel if you have the tools), or dive well within...

There's an argument to say that would introduce an additional failure point. If your (single, mechanical or gas integrated) spg fails, then just make a safe ascent.

Classic read. IMHO, the confusion arises due to the fact that pure Haldanian models do not feature ascent rate directly. They concern themselves only with maintaining inert gas tension below a critical value. By definition, within NDLs, the gas tension cannot ever become critical. (That is...

Enter an imperial tank size, then set it to metric... what does it read? Try a few others both ways. Are the numbers consistent with a 3000psi assumption? I think they are, but I can't say I burned a lot of cycles checking it. There won't be a wild variation unless you're switching between...

ROFL!!! You're funny. Dive your way, brother. I'm happy for ya any which way. For me, 3000psi Ali 80s are 678 cu inches and 3300psi Ali 80s are 625 cu in. Lessee... I could use 2 numbers, or I could use 1. (But if it's 2, I should make sure one of them is 77.4 and not 80, right?) You, of...

A "3000psi cylinder" doesn't actually mean much to me in a diving context (as opposed to a filling context). I only know what a cylinder of a specific internal volume filled with a specific gas to a specific pressure means. Working pressure is a redundant construct in this context. I'm...

Early 2010... spring in north america... summer 2010...

It seems to assume a working pressure (3000psi, from a back of an envelope calculation) from which the cf is derived. This gives internal volume, which is what you actually need. The manual ought to read: "enter cylinder size in cf volume at xxxx psi".