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Post by scubadiverbob on Apr 15, 2015 19:50:40 GMT -8
Don't know how the thread changed to diver training; but, when I learned to dive we had to learn to dive, swimming across the pool, with just a tank and fins. Also, we were taught to re-compress a diver. Both skills, thank God, I've never had to use!
Buddy breathing with a DH; I know how to do it; but, have never had to. My DA and Hydrotwin II both have octos attached.
I really think buddy breathing should still be taught. I've used it twice; once when my dive buddy had problems and once when my mouthpiece broke. Both times a octo was used.
My son just completed Rescue Diver and being able to remove and put your gear on underwater was a needed skill to completely untangle himself from the fishing net. It can be a practical skill to know and master. Andrew knows how to remove everything, including weight belt, and swim down and put it all back on. Don't know if he will ever use this skill; but, it certainly was a good confidence builder!
So, does anyone still teach re-compressing a diver? I always wondered if there would be enough air available to do it .... like four to six hours for two divers? Don't think that's taught anymore! I still have my PADI AOW manual with that in it .... ok, I ain't too very old and vintage! I'm still sorta young!
Robert
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Post by SeaRat on Apr 17, 2015 19:42:37 GMT -8
Robert,
I don't think anyone in their right mind right now would do in-water recompression after a case of the bends had occurred. There would just be too many potential complications, and the results would be potentially lethal.
Has anyone thought that we now have a generation of "technical divers" who think it is okay to use either rebreathers or open circuit with multiple tanks using different mixes costing thousands of dollars, and dive without a recompression chamber available to extremes depths and using long decompression schedules? Cousteau, from his earliest days, had a deck recompression chamber available for his divers. But today's technical divers feel free to dive without one. This is why we set up "sport diving" to be within the no-decompression limits--because we did not have ready access to a recompression chamber. ________________
I was diving today, and dove my Mossback Mk 3 regulator with the Hope-Page mouthpiece. I really like it, and put it through paces in pretty high currents (2+ mph). It performed beautifully. I had to surface several times, and noted that the mouthpiece leaked air when I was on my snorkel several times. If I got vertical, then there was a lot of air flow, controlled if I wanted to pull the mouthpiece down. But I was busy with my hands doing other things (GoPro camera and either taking off or putting on my dive helmet). I did not try to put the hoses under one arm, probably because I have never done that. But I also was attached to a float by a line, and that could have complicated the line routing; it got tangled as it was enough to cause me some problems. 'Made me wish I could turn the mouthpiece off.
John
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Post by cnotthoff on Apr 18, 2015 9:53:02 GMT -8
Yea Bob, I do enjoy going off on tangents. My calculus professor was a very interesting and intelligent man in his 80's who had led a fascinating life. We liked to bring up subjects that had nothing to do with trigonometric substitutions, and watching him run with it. But I digress. So yea, I like the DSV. Just to be clear on our terminology, when we talk about buddy-breathing we mean 2 divers sharing 1 second stage. If you learned to dive more than 20 years ago, you spent time taking 2 breaths, passing the second stage to your buddy, then hoping he gave it back after his 2 breaths. John's post of Dennis Graver's article on this technique covers the pitfalls of that approach to dealing with an out-of-air situation. Diving with an octopus or Alternate Air Source is called planning ahead. That is what good divers in any situation do. You are correct that removing gear and replacing it underwater is a great confidence builder and appropriate for advanced training. Other than recovering your investment, there is no practical purpose to being able to dive back down and recover your gear. During rescue training, an instructor has the time to make that clear. NAUI's lawyers would hang me out to dry if I taught or used in-water recompression to treat a diver showing signs of decompression illness, instead of following current standards of oxygen therapy and transport to the nearest recompression facility. John, you sure are right about the risks associated with extreme exposures without a chamber on site. It's amazing what a diver can do for fun that OSHA would have a fit over. I have been fortunate to dive with technically-trained divers who are very experienced and take great care in planning their dives to avoid the need for that chamber. But I know, shtuff happens. If you'd like a good read on the early days of technical diving, try this: www.amazon.com/Last-Dive-Father-Descent-Oceans/dp/0060932597/ref=sr_1_1?s=books&ie=UTF8&qid=1429378655&sr=1-1&keywords=the+last+diveI'm blabbing on line today because the Gods didn't smile on us, so our favorite wreck is sanded in. Now the good tides and swell predictions will go to waste. Good Dives, Charlie
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Post by scubadiverbob on Apr 19, 2015 8:42:19 GMT -8
Still don't know how divers can retrieve all their gear now-a-days .... I was taught swim down, sit by my gear, put my weight belt across my legs (to hold me down), then stick my regulator in my mouth ....
Now, they have weight integrated bc's and weight belts ??
Also, has anyone had to do it after basic openwater class ?? It's like swimming across the pool, underwater, with a tank, breathing off the tank valve ... never had to use that skill again!
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Post by scubadiverbob on Apr 19, 2015 8:48:42 GMT -8
Still remember "don't open the valve too much; just need enough air to breath" in my NASDS class ... guess if you didn't do it right, you could blow your lungs up!
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Post by SeaRat on Apr 19, 2015 12:14:22 GMT -8
Here's a quote from Robert, about breathing directly off a tank (not something having to do with the DSV): Still remember "don't open the valve too much; just need enough air to breath" in my NASDS class ... guess if you didn't do it right, you could blow your lungs up! As the Mythbuster's guys say, "DON'T TRY THIS AT HOME!!!" Or anywhere, for that matter. This has been thoroughly outlawed in every instructional agency that I know about. John
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Post by cnotthoff on Apr 20, 2015 9:30:05 GMT -8
So right after I go off on a rant that there is no real-life situation where a diver would ditch a perfectly good scuba unit and swim to the surface, I started reading Clive Cussler's Eye of Heaven, a Fargo Adventure. While Sam Fargo is cutting loose cargo nets loaded with stolen antiquities, the villain's yacht fires up its big diesels and takes off, snagging our hero's scuba unit in one remaining net. Sam is able to ditch his gear and avoid the spinning props with no more than a chewed-up fin. I stand corrected. Good Dives, Charlie
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Post by scubadiverbob on Apr 20, 2015 23:30:07 GMT -8
..... and back to what the original thread was about; Michael, how long will it be until we can buy one of your new mouthpieces?
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Post by Deleted on Apr 21, 2015 4:31:38 GMT -8
..... and back to what the original thread was about; Michael, how long will it be until we can buy one of your new mouthpieces? Robert, This takes a large outlay of cash just for the molds! I found a good recommended mold maker outside the USA but his prices are still outside my range.......anyhoo, I will be running a new crowdfunding campaign shortly and if it is successful then by the end of summer, early fall these will be available, this is my guess. (molds have to be made, samples inspected, molds shipped and molding parts injected, not to mention the silicone valves, mouthpiece bites and other odds and ends....a long process). A DSV is not a simple mouthpiece like the standard rubber ones on DHR's of the last century. Ask any rebreather advocate, there are many pieces. The caveat of this campaign is simple.....it is an All or Nothing fundraiser. If the goal is not reached, Paypal will refund all monies donated within 3-5 business days. No donor looses their money but there is no mouthpiece or for that matter no Sea Wolf Mk5 either. I've realized (with wife's help) that if there are not enough folks interested then I am just chasing a ghost. Mossback
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Post by nikeajax on Apr 21, 2015 10:53:18 GMT -8
"Hubris is the dividend paid out to those who invest too much in being right."Michael, I hope for the sake of the entire diving community enlarge that they can look beyond their myopic scope and see that this is an advancement and not just a specialized gadget or toy with limited use. I know for certain that if you do not get this made for us, it will only be a matter of time that something identical will come out and people will say, "Gosh, I sure wish we had these when I first started diving, 'so-and-so' would still be alive today..." I have been reading Huck Finn as of late: I'm at the end where Tom and Huck are trying get Jim out. Huck has the right idea: just do it and be done, the easiest way is the best way. Tom on the other hand has these grandiose and romantic ideas: if it's too easy, there's no glory in it and it's not worth doing. Well, Tom ends up getting shot in the leg, almost dying, and Jim is nearly lynched... Jaybird
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