For MSDF's newest 'ninja' submarines, it's all about stealth (Japan)

The Asahi Shimbun, Japan ^ | April 01, 2014 | FUMIAKI SONOYAMA

[sukhoi-30mki]

[Army Air Corps]

Ping.

[sickoflibs]

[null and void]

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

The HMS Bagel...

[Army Air Corps]

Ping.

[American Constitutionalist]

Drone Subs ?

[sickoflibs]

1941 on Jap sub

[DemforBush]

Neat design.

[Alex Murphy]

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?"

[American Constitutionalist]

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.

[Husker24]

Doesn’t the exhaust leave a trail of bubbles?

[skinkinthegrass]

!

[Jack Hydrazine]

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

[null and void]

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...

[MHalblaub]

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.

[american_ranger]

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.

[The Duke]

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

[sickoflibs]

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.

[AppyPappy]

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.

[GonzoGOP]

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.