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Japan's Silent Submarines Extend Range With Lithium-Ion Batteries (nikkei.com)
AmiMoJo shares a report from Nikkei Asian Review: Japan's first submarine powered by lithium-ion batteries was launched on Thursday. The [Soryu-class diesel-electric] submarine can reach speeds of roughly 20 knots and displaces 2,950 tons. It will be delivered to the Japan Maritime Self-Defense Force in March 2020. Batteries are recharged by the energy generated by Oryu's diesel engines. The vessel switches to batteries during operations and actual combat in order to silence the engines and become harder to detect. The lithium-ion batteries radically extend the sub's range and time it can spend underwater.
Plus, when they run out of charge, they double as torpedoes.
enjoy the sensation, m'ladies
This news reminds me this nice game and endless batteries swapping while on high depth in lava biome.
Fuel-cells would be better and just as quiet.
Old is new again.
I would think they'd make damage control very difficult though.
There's no point in questioning authority if you aren't going to listen to the answers.
hopefully our kids will be smarter, less greed fear ego based.. in the moms we trust..
They should be using clean American coal. The engines would be almost silent and it burns so clean you don't even need an exhaust
more range than a nuclear reactor?
They're glorified diesel Type XXI boats (WW2 German boats).
If you really want extended underwater capabilities, well, that's why they invented the nuke boats....
"I do not agree with what you say, but I will defend to the death your right to say it"
... out on the Big Pond.
Aviation Anti-Submarine Warfare Technician 2nd class.
The other side of the story is using hydrophones (waterproof microphones) to listen to the deep.
Every major country has these permanent stations anchored out across the oceans.
An audio spectrum analyzer sweeps the apparently random noise with tones from near zero up to the khz.
Obviously, when noise from the sea is the same frequency as the artificial pure tone, they are added together.
Rinse, repeat.
The results are charted with frequency on the X axis and amplitude on the Y.
A computer alerts when it sees a straight line, created over time.
That's the tone and sea noise agreeing when they coincide with the sounds of reefers (ice boxes), generators, prop cavitation, screw bearings, engine noises, and miscellaneous unwanted fingerprints.
We could tell you the fucking captain's name by the signature.
Aircraft drop sonobouys to do the same.
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Then there's this:
Submarines, to date, have a lot of fucking metal that distorts the Earth's magnetic field locally.
Permanent or airborne magnetometers can pick up these small anomalies.
Sunken ships have long been logged and they don't move.
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Then, there are active sonar devices, permanent or airborne (tethered from helicopters) that map the surroundings and alarm on novel or moving objects.
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The submarine/anti-submarine balance of technology is similar to the battle of virus/antivirus one.
This latest improvement by the Japanese may or may not be better than existing or future state of the art detection.
It little behooves the best of us to comment on the rest of us.
One hit that causes water to leak and it blows itself up.
The ladies gossip that you are kinda slow, this confirms it.
https://en.wikipedia.org/wiki/...
German Type 212 up to 3 weeks of silent running on fuel cells.
Many of the WWII era subs used a hybrid system. The USS Seawolf used early in the war had four diesels: two connected directly to the props, two connected to generators. The sub could only drive at max speed with all four diesels running, two driving the props directly, two supplementing the power by first generating electricity that was then fed directly to the motors on the props.
I'd rather have a bottle in front of me than a frontal lobotomy
why is an American submarine shooting an Russian torpedo
1173 = model # Staffed by self defense unit 5O
The vessel switches to batteries during operations and actual combat in order to silence the engines and become harder to detect.
Like ... all diesel electric boats.
(I get that the point is that these are better batteries. That was just kind of weird.)
if they are using a Lithium-Cobalt chemistry. Hopefully they've chosen a Lithium-Phosphate though. These are tough cells.
The article is too lacking.
Noise isn't necessarily the problem with nuclear reactors, it's the heat. They dump a bunch of heat into the water, which can be picked up by satellites. They have to go *deep* to evade detection this way, which limits where they can go. You won't be able to tell *exactly* where the sub is, but you get the idea that one is in the area, and it's general direction.
My Other Computer Is A Data General Nova III.
If they'd had these batteries during the war, they could have defeated the U.S. even after their fuel supply was stopped.
Why would the Japanese name a warship after one of the carriers that went down at Midway, the battle that pretty much ended their empire?
The dangers of excessive individualism are nothing compared to the oppressiveness of excessive collectivism
How about an article about VPT lithium batteries for rebreather divers?
Those can also dive silently for much longer times than the old compressed air ones and it's useful for us as well.
KyatapirÄdoraibu
You never expect irony, do you?
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@iyfwrestling
Diesel electric submarine tech has been around close to a century so that's not new.
Running on electric is quieter and in the submarine warfare scenario, that is crucial.
Batteries don't radically extend range. What is likely is that the batteries have better range than previous types of batteries.
This is all information that is easily available and yet the referenced article reports on it poorly.
So ask yourself, "How accurate is the media when it comes to information that is hard to obtain?"
"Consensus" in science is _always_ a political construct.