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Three U.S. and British Subs Meet at the North Pole |
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SaltiDawg
Rickover Joined: 03 Jan 2016 Location: Rockville, MD Status: Offline Points: 2865 |
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Posted: 24 Mar 2018 at 6:23pm |
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Agree.
Airless surfacing (with LP Blower) would not cut it with the thicker ice we surfaced thru before the later restriction. The head valve sometimes was much, much deeper when we Vertical Surfaced. Edited by SaltiDawg - 24 Mar 2018 at 7:31pm |
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FTGC(SS) Lane
Old Salt Joined: 05 Jan 2016 Location: Conway New Hamp Status: Offline Points: 262 |
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This was after airless surfacing becoming routine. It is the same as using MBT except it takes a bit longer. Get the water out of the MBTs and the boat comes up more and is stable on the surface.
One surface the ice was across the top of the sail. The XO attempted to raise #1 and wondered why it wouldn't go up more than a couple of inches. He was looking down the well to see if he could figure out why; and I did to, until dawn broke over Marblehead(s) and we realized what the cause was. |
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SaltiDawg
Rickover Joined: 03 Jan 2016 Location: Rockville, MD Status: Offline Points: 2865 |
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Interesting!
On the earlier 637`s we blew MBTs after we had stopped rising vertically... which always was immediately. Would use as little HP air as possible, and as soon as head valve or upper hatch was open we'd use the LP Blower. Always wanted to keep HP Air Flasks charged, and did not want the noise from the compressors. Again, this frequently was thru ice much thicker than a later imposed restriction. Edited by SaltiDawg - 24 Mar 2018 at 7:30pm |
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FTGC(SS) Lane
Old Salt Joined: 05 Jan 2016 Location: Conway New Hamp Status: Offline Points: 262 |
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As DOOW I did 35+ vertical surfaces and 40 stationary dives in '82 and '84 on two 637 class boats. I don't know what a "Arctic Blow" is either. I only surfaced through ice. Once the sail broke through and the head valve opened we used an airless surface. If the head valve did not open then we did a normal MBT blow. Edited by FTGC(SS) Lane - 23 Mar 2018 at 8:15pm |
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SaltiDawg
Rickover Joined: 03 Jan 2016 Location: Rockville, MD Status: Offline Points: 2865 |
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SaltiDawg
Rickover Joined: 03 Jan 2016 Location: Rockville, MD Status: Offline Points: 2865 |
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Joe, In the day, simplistically, we'd determine the draft of the ice canopy using an upward looking active portion of the Under ice suite as we transited along. We'd keep track of the areas where we thought we might surface in an emergency by marking them on the DRAI plot. If too much time elapse... e.g. the distance to the last surfacing area became excessive, we would slow and do a search on either side of our track. Finding one, we'd mark it and resume our transit. Due to what some of us considered an "artificial restriction" on ice thickness we were permitted to surface thru, this safe surfacing feature came to be defined as flat refrozen areas called Polynyas. Prior to that restriction being issued, we found that indeed the thinness areas were not at al the easiest to surface thru. Indeed on Pargo, for example, we routinely surfaced thru ice many times that "artificial restriction" which had not yet been dreamed up. Also, note that I did not say we plotted polynyas or refrozen spots exclusively - we found some other features that were generally much easier to surface thru and included those and thus plotted "Safe Surfacing Areas." With the addition of a max ice thickness for surfacing, I would assume boats would plot "Open Ice" rather than "Safe Surfacing Areas." That "restriction" was based on a concern that if you deballasted "too much" without upward movement thru the ice that the boat would become unstable in the athwartship plane. This was a Naval Architecture concern. A few years after that restriction was put in place, I had the opportunity to work with Capt Harry Jackson during a summer at MIT. At my request, the Class did an analysis of the issue and we concluded that the restriction from a Naval Architecture perspective could not be justified. "To punch through the ice, the submarines conduct what’s called an “Arctic blow,” venting ballast to rapidly boost buoyancy." On those trips and my later trips on Trepang we did not Vertical Surface with MBT vents open. I have no idea what an "Arctic Blow" is, and I've participated in many dozens of Stationary Dives and Surfaces on SSN-637s. Edited by SaltiDawg - 23 Mar 2018 at 7:35pm |
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FTGC(SS) Lane
Old Salt Joined: 05 Jan 2016 Location: Conway New Hamp Status: Offline Points: 262 |
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It is polynya, a Russian word, meaning open water. We use the word to describe the areas between ice keels that is thin enough to break through. And, without aid from on the ice, they have to be searched for. |
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Sewer Pipe Snipe
BBS Supporter Joined: 04 Jan 2016 Location: Albany, GA Status: Offline Points: 5723 |
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I think the term was planchia, areas deemed thin enough to bust thru. Those were closely tracked in case there came a need for one of them. It would seem that they knew where they were located before they went looking for them. They used the same sonar used to determine wave heights, I would guess. That was a long time ago, and what I knew or may have known I probably forgot. As I believe we all had been instructed to do.
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Walt,
Had I done everything right throughout my life, the World wouldn't have noticed. |
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FTGC(SS) Lane
Old Salt Joined: 05 Jan 2016 Location: Conway New Hamp Status: Offline Points: 262 |
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A top sounder is used to detect ice thickness. Some engineers determined that 4' was the maximum thickness a 637 class could safely break through.
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Runner485
BBS Supporter Joined: 16 Dec 2015 Location: Delaware Status: Offline Points: 3199 |
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A question I have for all you olden day nucs, is how did you know the boat was at a point of thin enough ice to break thru and surface. Did you use the same method that was just used? And BTW, how did they know the ice was thin enough to surface and just what is "thin enough"? |
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DBF
Joe SS485,CVA42 Holland Club Mid-Atlantic Base |
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