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Old 09-12-2015, 14:35   #91
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Re: Encounters of the Submarine Kind

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Negates my first sentence?

Nonsense.

The Greenville incident in particular was a result of several factors aside from the CO but as a matter of course submarine CO's are definitely not "hot dogging" it.

Have you ever served on a submarine?
In my younger days, got to exit from a sub at 100 feet depth.
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Old 09-12-2015, 14:36   #92
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Re: Encounters of the Submarine Kind

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IIRC, he was on a diesel boat (a time when the French navy still had some of them).

Anyway, periscope depth isn't the same on all subs. At 2660 tonnes dived, the present French SSN (attack subs) are much smaller than the US ones (about 6900 tonnes dived for Los Angeles class). So, they have shorter periscopes.

Alain
Fair enough. Easy enough to estimate PD and clearance. Add the diameter of the hull and the height of the sail and you can arrive at a pretty good approximation of both.
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Old 09-12-2015, 14:37   #93
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Re: Encounters of the Submarine Kind

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Was once sailing in the adriatic and the depth went from 80m to 12m then to 5m then back to 12m then 80 again. Looked at my fish finder and it sure looked like the outline of a sub. Forgot to take a photo of the ff...
If you were hugging the Dalmatian coastline, there are lots of underwater outcrops that you need to keep a watch for.
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Old 09-12-2015, 14:37   #94
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Re: Encounters of the Submarine Kind

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In my younger days, got to exit from a sub at 100 feet depth.
From an actual sub or the escape trainer?
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Old 09-12-2015, 14:41   #95
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Re: Encounters of the Submarine Kind

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From an actual sub or the escape trainer?
Both. 1970-71.
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Old 09-12-2015, 17:49   #96
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Re: Encounters of the Submarine Kind

SkipMac your right, the Tongue of the Ocean is unique, when we sailed the Exumas we had seen the "Russian Trawlers" in the area and also "US Naval research vessels". Back then the Bahamian locals talked about all the subs they would see in the area and the ships that chased them around.
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Old 10-12-2015, 06:20   #97
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Re: Encounters of the Submarine Kind

There use to be a Russian trawler and escort sub that hung out around Molokai Channel for years. A rather large(100') steel ketch was permanently anchored in Kbay with an incredible array of antennas. Base command figured it was just a listening station for Hawaii's military traffic. Not much could be done about it. Satellites have made all that stuff obsolete.

BTW, never cross the wake of a naval ship, they might be dragging a long line array of acoustic detectors. Can be up to 1000 feet long. Nasty steel will rip right through a plastic sailboat.
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Old 10-12-2015, 07:35   #98
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Re: Encounters of the Submarine Kind

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If you want a good read about submarine OPS in the Cold War, read Blind Man's Bluff. Operation Ivy Bells is particularly amazing.
Used to dive with a guy that came from US subs. I asked him what he did and of course he couldn't say much but said to read that book. He did tell me his job involved electronics and noise and related stuff, ECM if I recall.

Book was very fascinating. The bit about the divers exiting the sub at depth to deal with the taps we put on the Russian cables was outrageous. I think it was around 1000' which is pretty extreme depth.
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Old 10-12-2015, 08:35   #99
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Re: Encounters of the Submarine Kind

We got cute little robots to do that work nowadays. At extreme depths, decompression can take several days, even with a lot of nitrogen in the rebreather units.
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Old 10-12-2015, 08:47   #100
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Re: Encounters of the Submarine Kind

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We got cute little robots to do that work nowadays. At extreme depths, decompression can take several days, even with a lot of nitrogen in the rebreather units.
You mean helium in the breather? Nitrogen is one of the slower gases to offgas from your tissues. Also at those depths much nitrogen would get you stoned out of your mind.
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Old 10-12-2015, 08:50   #101
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Re: Encounters of the Submarine Kind

Love this thread having work on subs for the past 35 years. The noise was almost certain the Low Pressure blowers clearing the ballast tanks, with huge amount of air expelling from the bottom of the tanks. Makes low rumbling sound, this mostly is done after just surfacing. Having sailed around tidewater area my whole life, we have had many encounters with subs. The ones where you get pinged "active sonar" are spooky when you hear this sound resonate from the hull. But the best was as a teenager we were sailing at a good clip and this 688 class is coming back in. We hit his wake squarely and I have never seen a wake like that one. The bow went into the second wave, water hitting the cabin trunk was sent up in the air getting everything wet. The main was soaked up above the spreaders, with spray getting to the mast head. I was sitting next to the mast and it was crazy the amount of water that came over the boat. Now days they don't come in at flank speed.

The Silent Service of the USA is very special and to any who has served, I would like to say thanks. They are the best.
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Old 10-12-2015, 10:50   #102
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Re: Encounters of the Submarine Kind

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You mean helium in the breather? Nitrogen is one of the slower gases to offgas from your tissues. Also at those depths much nitrogen would get you stoned out of your mind.
Your correct.
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