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DAAM IP
Aug 29, 2023 12:54:47 GMT -8
Post by SeaRat on Aug 29, 2023 12:54:47 GMT -8
If you’ve read Cousteau’s The Silent World, you’ll note tha Frédérick Dumas survived an underwater explosion by dynamite fishermen in the early 1950s.
No, it was not for other divers to use the regulator, but that the regulator would still function after a diver was exposed to either gunfire, shelling or explosions.
SeaRat
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DAAM IP
Aug 29, 2023 17:18:49 GMT -8
Post by SeaRat on Aug 29, 2023 17:18:49 GMT -8
Okay, let me give some perspective on the twisting on the ears of the of the horseshoe "Support, Lock" (left and right). This is not mentioned in the U.S. Navy Diving Manual, March of 1970. However, it was a practice I saw during our instruction at the U.S. Naval School for Underwater Swimmers. Under normal conditions, the twisting does not need to be done. But the U.S. Navy divers did not alway work under normal conditions. They sometimes worked under combat conditions, and the equipment was potentially subjected to rather rigorous trauma (like explosions underwater) which could really rattly the regulator. To prevent the horseshoe from being dislodged under these conditions, the instructors recommended the twisting of the ears of this support after assembly. Because the diaphragm holds the horseshoe in position on the extreme end, and the nut holding seat on the other, there is little possibility of the horseshoe coming out from the ears of the Lock Support. But under combat conditions, all bets are off. So far as making things worse, if done correctly the twist doesn't affect the movement of the horseshoe; but not all people did it correctly. John Hi John, I am not sure I am following this concept. I am sure that you are aware that any underwater explosion capable of rattling a regulator that much, will more than certainly kill the diver. There are lots of information about the effects of underwater explosion on the human body, without needing to dig deep (no pun intended) ... This is not classified information... science.howstuffworks.com/explosion-land-water1.htmSo, what was the idea? that under combat condition, if they recover the body, another diver could use that same regulator without first servicing it? Maybe the instructor was being way too optimistic... Luis, I just went to J.Y. Cousteau and Frédérick Dumas' book, The Silent World to refresh my memory about their experiments with underwater explosions. My reference above was accurate, and my memory intact. I'll get to that in a moment. Before I do, we had USAF Pararescueman in the water under combat conditions, rescueing downed pilots from the HU-16B Albatross amphibian in the mid-1960s. They were inside Haiphong Harbor, in what then was known as North Vietnam, and under shell and small arms fire. Usually they were not is scuba gear, but had the scuba gear available on-board the aircraft. Under those conditions, the equipment was potentially exposed to the shock wave of a shell landing near the aircraft (which happened a lot). We also lost at least one Albatross to shell fire, along with some of the crew. So under these conditions, the Aquamaster regulator would be subjected to these blast forces. We had progressed to single hose, usually Calypso regulators by that time, but this is what the U.S. Navy Underwater Swimmers School instructors were thinking about when we crimped those ears on the holder. HU-16B dropping package-A by John Ratliff, on Flickr Now, back to Cousteau's experiments. Here's what he wrote: In addition, I have done a google scholar search and found a more recent publication on underwater explosions. Here is the abstract: It turns out that there is no good scientific documentation about underwater blast injuries. This was confirmed in the body of this article: John PS, I actually found Elmer Jacob Artist’s original paper on blast injuries, from 1943. The portion about underwater explosions starts on page 47. This is some of what Cousteau was talking about when they did their experiments on diver reactions to underwater explosions. digitalcommons.unmc.edu/cgi/viewcontent.cgi?article=2055&=&context=mdtheses&=&sei-redir=1&referer=https%253A%252F%252Fscholar.google.com%252Fscholar%253Fstart%253D30%2526q%253DHaldane%252Band%252Bunderwater%252Bexplosion%2526hl%253Den%2526as_sdt%253D0%252C38#search=%22Haldane%20underwater%20explosion%22
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