Yuan Class AIP & Kilo Submarine Thread

superdog

Junior Member
Re: PLAN Yuan Class D/E AIP Submarine Thread

Whoa, have you used your brain? Perhaps they were intentionally leaked? The Chinese government maintains an official policy of secrecy but it doesn't hurt to leak accounts to boost the military's public image. Have you completed elementary school? Superdog already said he got it from a 'navy office observer' AKA an officer; don't you understand English? Can you stop asking obvious questions? I thought it was pretty obvious such an incident would have its official report classified but maybe that's why it's called a 'leak'?
No need to be too harsh, I think that's a valid question. The information I posted was translated from an article supposedly originated from a recent issue of the PLA newspaper, written by someone who was on the boat, so you could consider it officially disclosed information. I read the article when it got posted to the Internet by a fairly reliable blogger and I haven't found the original newspaper to confirm, so I cannot be 100% sure this is not made up, but I'm fairly confident because all the details matched up with the official reports that I CAN confirm.
 

shen

Senior Member
As I posted earlier sea temperature and salinity both becomes stable at 200m there could be a down flow current that the sub may have hit but those currents are no faster then a few knots 10 at most. There are no natural variables that can trigger such dangerous effects.

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some the largest internal waves occur near Taiwan province.

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Yorkie

New Member
Here is a summary of what I understand from the story posted above:

1) the sub was conducting its mission at the deep end of its operating depth at slow speed, likely less than 4 knots
2) it hit a sudden change in salinity, causing the sub to be grossly out of trim (heavy) and gained depth fast
3) For the first 4-5 min, the OOD tried to regain depth control by normal ops procedure and gradual increase of speed, but failed
4) emergency procedure was initiated at about 5 min. into the incident, shifting to some kind of high power mode to increase speed and preparing to blow ballast. Captain was alerted and he took control of the ship.
5) just as they tried to get some speed going, a water leak occurred at the main engine room due to hull being crushed by the pressure at depth (likely not the hull itself as suggested by some member)that caused crew to shut off engine, thus losing propulsion (now this is the worst nightmare scenario!)
6) at about 6 min they blew ballast. At this point sub was head was pointing up but sinking still!
7) engine crew was able to stop the flooding and restore limited propulsion
8) sub eventually surfaced with combination of ballast and limited propulsion

All in all, a very fortunate end to a very scary incident! Hats off to this crew for their skills, seamanship, and professionalism in handling this emergency, saving the ship and their own lives! It also speaks volumes of just how good their damage control and ship handling training is. Bravo!!!
 

jobjed

Captain
Re: PLAN Yuan Class D/E AIP Submarine Thread

No need to be too harsh, I think that's a valid question. The information I posted was translated from an article supposedly originated from a recent issue of the PLA newspaper, written by someone who was on the boat, so you could consider it officially disclosed information. I read the article when it got posted to the Internet by a fairly reliable blogger and I haven't found the original newspaper to confirm, so I cannot be 100% sure this is not made up, but I'm fairly confident because all the details matched up with the official reports that I CAN confirm.

I have no problem with the nature of his question, but rather the manner of its expressing. Take a look at the rest of his posts and they're very obviously poor attempts at sarcasm; laden with irritating rhetorical questions and reeking of insensitivity. My reply to him was but an emulation of his despicable methodology so that he may, as the idiom goes, have a taste of his own medicine.
 

superdog

Junior Member
Here is a summary of what I understand from the story posted above:

1) the sub was conducting its mission at the deep end of its operating depth at slow speed, likely less than 4 knots
2) it hit a sudden change in salinity, causing the sub to be grossly out of trim (heavy) and gained depth fast
3) For the first 4-5 min, the OOD tried to regain depth control by normal ops procedure and gradual increase of speed, but failed
4) emergency procedure was initiated at about 5 min. into the incident, shifting to some kind of high power mode to increase speed and preparing to blow ballast. Captain was alerted and he took control of the ship.
5) just as they tried to get some speed going, a water leak occurred at the main engine room due to hull being crushed by the pressure at depth (likely not the hull itself as suggested by some member)that caused crew to shut off engine, thus losing propulsion (now this is the worst nightmare scenario!)
6) at about 6 min they blew ballast. At this point sub was head was pointing up but sinking still!
7) engine crew was able to stop the flooding and restore limited propulsion
8) sub eventually surfaced with combination of ballast and limited propulsion

All in all, a very fortunate end to a very scary incident! Hats off to this crew for their skills, seamanship, and professionalism in handling this emergency, saving the ship and their own lives! It also speaks volumes of just how good their damage control and ship handling training is. Bravo!!!
Thanks for the summary. Just a few corrections based on what the article disclosed:

4) emergency procedure was initiated at about 5 min. into the incident, shifting to some kind of high power mode to increase speed and preparing to blow ballast. Captain was alerted and he took control of the ship.
^Based on the wording in the article, the captain did not take over during the incident, he only "helped". This was probably because the other captain (a training captain?) has more experience than the ship captain. The presence of two additional highly ranked commanding officers suggest that this could be a high risk mission.

7) engine crew was able to stop the flooding and restore limited propulsion
^They did not restore any propulsion during the drop. They went back up purely by blowing the ballast and stopping the leak. Also note that it was a controlled surfacing not emergency surfacing. They restored limited propulsion after they surfaced.

Also, in some media report (but not in the article I translated) it was mentioned that this incident happened in the Indian ocean, e.g.
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. I have yet been able to find any official confirmation about this.
 

Yorkie

New Member
Thanks for your corrections, SD. One thing though: once the main ballast is blown, it is an emergency surfacing by default because the crew at that point does not have control over the sub's depth. The positively buoyant sub will just pop out to the surface by the force of buoyancy.
 

superdog

Junior Member
Thanks for your corrections, SD. One thing though: once the main ballast is blown, it is an emergency surfacing by default because the crew at that point does not have control over the sub's depth. The positively buoyant sub will just pop out to the surface by the force of buoyancy.
I'm no submarine expert but according to the article I don't think they did a full emergency blow. It was stated that they did a controlled rise after ensuring surface conditions were safe.
 

FORBIN

Lieutenant General
Registered Member
According several accurate infos... now 12 Yuans 340/341 are in service in two Flotillas, i presume number up to end 2013, normaly 2 Yuans build by year for a class with about 20 units seems planned.

And on English Wikipedia i see 13 Yuans, and on Chinese version 12+, with one of this year 13 can make sense.

And this new could be belong at this new version 039B+ # 342 ?
 

thunderchief

Senior Member
Maybe not best thread for this, but again we have rumors about China purchasing Amur 1650

Russian Submarine The Amur 1650 To Be Given To China, India’s Nuclear Energy Welcomed By Russia

A new Russian submarine design called the Amur 1650 is going to be sold to China, with Vladimir Putin hoping that Russia’s economic recession may be averted partially by making deals with the Chinese. Russia also publicly welcomed the expansion of India’s nuclear energy.

In a related report by The Inquisitr, the Russian military successfully tested a Bulava intercontinental ballistic missile (ICBM) launched from the Russian nuclear submarine the Vladimir Monomakh. The U.S. Navy believes that the newest of China’s nuclear submarines the Jin SSBN “would mark China’s first credible at-sea-second-strike nuclear capability.” There’s also talk of a Chinese supersonic submarine that could cross the pacific in less than 100 minutes.

Vladimir Putin has publicly stated that Russia’s nuclear weapons and the Russian submarine fleet will be given an overhaul in the next five to 10 years. To give readers an idea for why this is considered necessary, this was the condition of a Soviet era Viktor-class Russian submarine when it was decommissioned......

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