chrpai
Contributor
Nothing like insulting and threatening to back up your argument.
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...//... I have RGBM on my Liquivision. Still trying to decide the ideal GF to set for recreational dives. ...//...
FWIW, this entire thread was started when a so called expert claiming that studies supported the argument but when he was called on it he changed the context of his answer and stated that no such (to his knowledge) studies existed to back up his original statement.
While 5 minutes sounds better then 3 to me, the fact remains.... we don't *know*.
Richard I wouldn't always assume low sac= woman.This is likely an issue of 'where you stand on an issue depends on where you sit,' and 'different strokes for different folks.' You are a woman, which many associate with lower SAC rates, and you obviously use relatively little gas.
I'm a guy, 6'1, nearly 275#, chunky & mid. 40's. No real shock, I go through gas a lot faster than you. My computer-calculated SAC rate tends to run around 0.65 cf/min. Not real bad, all things considered, but if I considered 2,000 PSI my turn pressure & thought I was supposed to get back to my entry point with 1,000 PSI, I'd dive really short profiles.
Richard.
Except that you need Advanced Nitrox training and an O2 tank with an extra regulator to do the extra couple of minutes on O2. Just about $1,000 if you add the class and tank/regulator.Most of the divers I do deco dives with add a couple extra minutes of O2, after we clear our last stop. I see no harm in doing similar on a rec dive.
...//... you need Advanced Nitrox training and an O2 tank ...//... I want the class for other reasons myself.
Take the course, get an old steel 72 and and keep it filled with O2 for the surface. When in doubt...
That seems odd, given the number of tech divers that I've heard of with osteonecrosis, which is most likely caused by untreated type 1 hits.I was listening to a DAN presentation at the History of Diving Museum (MM 83, Bayside), and the one thing that stuck out to me, was they could accurately depict what kind of diver you are depending on the type of DCS hit you got. If you got a type I, then you were a commercial diver. If you got a type II (neurological hit) then you were a recreational diver. Now, getting bent is pretty rare. So much so, that the presenter referred to it as slightly above statistical noise. But if you do get DCS, then they can categorize your diving with like a 98% accuracy. That's a wow in my book.
Later on in his presentation, he casually brought up that the half time for neural fluid was about the same for blood, @ 5 minutes. Now, if you think about it, it only takes about five half times to approach saturation (98.4%). Do the math and that's only about 25 minutes at depth to bring your neural fluids to 98.4% of being saturated at that depth. Doing a five minute half stop will reduce that excess by 50%. That only makes sense to me, so I just do a five minute safety stop. IOW, I'm going to ameliorate the already low percentage of getting bent by addressing the way I'm probably going to get bent in the unlikely event that I do.
BTW, the people who always seem to be overly tired after their dive, never seem to have done a deep stop or a full five minutes at their safety stop.
You think so? Some tech divers are more like commercial divers than they are recreational divers.That seems odd, given the number of tech divers that I've heard of with osteonecrosis, which is most likely caused by untreated type 1 hits.