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For MSDF's newest 'ninja' submarines, it's all about stealth (Japan)
The Asahi Shimbun, Japan ^ | April 01, 2014 | FUMIAKI SONOYAMA

Posted on 03/31/2014 9:02:57 PM PDT by sukhoi-30mki

Known as the “ninja of the seas,” Japan’s Hakuryu submarine carries enough firepower to knock out an aircraft carrier with a single blow.

But the Type 89 torpedo is not the vessel’s most effective feature in strengthening Japan’s warning and surveillance operations in its waters.

“A submarine’s greatest weapon is stealth,” Maritime Self-Defense Force Capt. Kaoru Yoshida said. “Our mere presence that makes (the enemy think) ‘there might be a powerful submarine out there’ is a deterrent.”

In the National Defense Program Guidelines formulated at the end of last year, Japan decided to increase its submarine fleet from the current 16 vessels to 22 over the next 10 years. A key reason for the increase is Chinese maritime forays, including in areas around the Senkaku Islands claimed by both Japan and China in the East China Sea.

Reporters from several media organizations, including The Asahi Shimbun, were allowed to take a trip aboard a Hakuryu submarine for the first time in late February.

The purpose of allowing access to the submarine was apparently to show that the MSDF can also flex its maritime muscle.

The Hakuryu shown to reporters was the third of the Soryu-class of submarines, which were commissioned from 2009. It has a standard displacement of 2,950 tons and a length of 84 meters.

Before heading out to sea, a “pssh” sound was heard as Capt. Yoshida, 40, gave the order to “begin launch” during a torpedo drill.

Soryu-class submarines can stay submerged longer because they generate energy by mixing fuel with liquid oxygen stored in tanks.

They are more difficult to detect with radar because they extend the air supply tube above the water’s surface far fewer times than the MSDF’s other submarines, which are propelled by batteries when submerged and use diesel engines to recharge the batteries.

A “snorkel” is essential to take in oxygen. But the air supply tubes and periscopes are easily detectable by radar.

“When the snorkel’s up, that’s your best chance to catch a sub,” a P-3C patrol aircraft pilot said.

But the stealth of the Hakuryu submarine comes at a cost in terms of comfort.

The Air-Independent Propulsion engine takes up 10 meters of the length of the submarine’s central section, leaving cramped living quarters for the crew of 65 or so.

The captain’s quarters cover around 3 square meters, while the officers’ quarters have three triple bunk beds to fit nine people in a room.

“It’s tough working in an enclosed space with limited water and air, but I’m motivated to take part in duties that only a few seamen can do,” Lt. Cmdr. Tomoharu Horiuchi, the Hakuryu’s 35-year-old chief engineer, said.

To maintain secrecy, crew members themselves often do not know when they are scheduled to return to their home port.

“We can’t even tell our families when we leave port,” Petty Officer 3rd Class Hayaki Kawai, 31, who has a 10-month-old daughter, said.

By FUMIAKI SONOYAMA/ Staff Writer


TOPICS: Foreign Affairs; Japan; News/Current Events
KEYWORDS: japan; jmsdf; stealth; submarine

1 posted on 03/31/2014 9:02:57 PM PDT by sukhoi-30mki
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To: Jeff Head

Ping.


2 posted on 03/31/2014 9:03:51 PM PDT by Army Air Corps (Four Fried Chickens and a Coke)
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To: sukhoi-30mki

3 posted on 03/31/2014 9:07:01 PM PDT by sickoflibs (Obama : 'You can keep your doctor if you want. I never tell a lie ')
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To: sukhoi-30mki

The British are also developing a sub that runs on diesel/LOX

The HMS Bagel...


4 posted on 03/31/2014 9:08:01 PM PDT by null and void ( Everything evil in the world may not be Islamic but everything Islamic is evil.)
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To: KC_Lion

Ping.


5 posted on 03/31/2014 9:11:16 PM PDT by Army Air Corps (Four Fried Chickens and a Coke)
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To: sickoflibs

Drone Subs ?


6 posted on 03/31/2014 9:12:01 PM PDT by American Constitutionalist
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To: sukhoi-30mki; American Constitutionalist
1941 on Jap sub


7 posted on 03/31/2014 9:16:31 PM PDT by sickoflibs (Obama : 'You can keep your doctor if you want. I never tell a lie ')
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To: sukhoi-30mki

Neat design.


8 posted on 03/31/2014 9:18:06 PM PDT by DemforBush (The scourge of mariachis and polka bands everywhere.)
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To: sickoflibs
1941 on Jap sub

"Where Hollywood?"
"Right here."
"What?"
"You're looking at him."
"Who?"
"Hollis Wood."
"Where?"
"Right here! Shoot, can't you understand plain English?"

9 posted on 03/31/2014 9:38:34 PM PDT by Alex Murphy ("the defacto Leader of the FR Calvinist Protestant Brigades")
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To: sickoflibs

As long as the Japanese stay our friends and allies I am all for it, so as long as they don’t turn into the Japan as in the 1930s 1940s.


10 posted on 03/31/2014 9:44:37 PM PDT by American Constitutionalist
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To: null and void

Doesn’t the exhaust leave a trail of bubbles?


11 posted on 03/31/2014 9:46:53 PM PDT by Husker24
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To: sukhoi-30mki

!


12 posted on 03/31/2014 9:48:50 PM PDT by skinkinthegrass (The end move in politics is always to pick up a gun..0'Caligula / 0'Reid / 0'Pelosi)
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To: sukhoi-30mki

Ask A Ninja!
(Do ninjas need love?)
https://www.youtube.com/watch?v=qdS5lkeN8_8


13 posted on 03/31/2014 9:56:22 PM PDT by Jack Hydrazine (Pubbies = national collectivists; Dems = international collectivists; We need a second party!)
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To: Husker24

It would if it were vented overboard. My understanding is that the waste heat from the exhaust is used to flash the LOX to gas so it can be mixed with the fuel and burned. The cooled exhaust is compressed and stored in high pressure cylinders and vented at the end of the mission.

Doubtless someone will be along shortly to correct me if my understanding is flawed...


14 posted on 03/31/2014 10:00:49 PM PDT by null and void ( Everything evil in the world may not be Islamic but everything Islamic is evil.)
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To: null and void

The LOX is just expanded to gas and mixed with diesel in the Sterling engines. I guess just the gas pipes need some heating to prevent ice. The carbon dioxide exhaust is dissolved into the seawater without bubbles.


15 posted on 03/31/2014 10:54:03 PM PDT by MHalblaub ("Easy my friends, when it comes to the point it is only a drawing made by a non believing Dane...")
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To: MHalblaub

Japanese torpedos were sure a lot better than ours in WWII. Very glad that their submarine tactics sucked.
Long Lance, I believe that they were called.


16 posted on 04/01/2014 3:09:59 AM PDT by american_ranger
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To: sukhoi-30mki
To maintain secrecy, crew members themselves often do not know when they are scheduled to return to their home port.

Next time they might want to reconsider allowing reporters on board, or even talking about their sub altogether! :O

17 posted on 04/01/2014 4:27:12 AM PDT by The Duke ("Forgiveness is between them and God, it's my job to arrange the meeting.")
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To: Alex Murphy

I know that movie is considered a bomb but I always got a kick out of it. I first saw it on HBO in the early 1980s.


18 posted on 04/01/2014 4:46:34 AM PDT by sickoflibs (Obama : 'You can keep your doctor if you want. I never tell a lie ')
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To: american_ranger

The Japanese strategy was that only capital ships were worthy targets. Merchant ships were to be left alone and possibly a sign of cowardice to attack one. Later, they decided to turn subs into delivery vehicles.


19 posted on 04/01/2014 4:50:48 AM PDT by AppyPappy
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To: AppyPappy
That was also partly driven by their torpedoes. The Japanese Type 93 torpedoes were much larger. In consequence they carried less rounds and had to reserve them for “worthy” targets. The Japanese B1 Submarine carried 17 torpedoes in six tubes while the US Gato class (only about two thirds the size of the B1) carried 24 torpedoes in ten tubes. The class Ro Submarines carried only eight torpedoes in four tubes. Since in World War II you had to fire a spread of torpedoes in order to ensure a hit the Ro class was limited to firing two spreads of torpedoes before it had to head for home. Under such circumstances you need to wait for a very good target.
20 posted on 04/01/2014 6:02:19 AM PDT by GonzoGOP (There are millions of paranoid people in the world and they are all out to get me.)
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To: MHalblaub; Husker24

See? One post!


21 posted on 04/01/2014 6:24:18 AM PDT by null and void ( Everything evil in the world may not be Islamic but everything Islamic is evil.)
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To: Army Air Corps

The JMSDF Soryu-class submarines are as state of the art AIP D/E conventional subs as it gets.

But they are not brand new.

The first was launched in 2007 and they have now launched six of them on the way to building ten.

They are very quiet and they do have a good weapons load.

Just the same, they do not have the endurance or the speed of a nuclear submarine and the latest Virginias (US Navy), Astutes (UK) and new Russian Yasen class submarines are also very, very dangerous, and carry a lot more weapons...and are capable of intersepcting high value military tagets on the high seas and keeping up with them...which also makes them good escorts for those high value naval vessels too.

These new AIP DEs though are going to be very dangerous in the littoral waters, at any choke point, or whenver and wherever they can lie in wait for an approaching task force.

Because of their slower submerged speed, they are hard pressed to intercept a transiting task force on the high seas...unless, as I say, they know where one is going to pass and can lie in wait for it.


22 posted on 04/01/2014 3:32:42 PM PDT by Jeff Head
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To: american_ranger

The long lance did most of it’s damage from the ship launched ones. Had a range of 20,000 yards I believe.


23 posted on 04/01/2014 3:36:10 PM PDT by Tijeras_Slim
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