最強潛水艇：新「海忍者」誕生
・第五艘大藝級潛艦「Chogei」下水！
・檢測能力和安靜性進一步提高
摘自《交通新聞》上發表的一篇文章的摘要。
Ministry of Defense: Friday, October 4, 2024:
The launching ceremony for Chogei was held at Mitsubishi Heavy Industries Kobe Shipyard (Kobe City).
Chogei is the fifth Taigei-class submarine.
1. It is larger than the French Navy’s Rubis-class nuclear submarine.
2. It is one of the largest diesel-propelled conventional submarines in the world.
Features of Chogei:
1. Overall length 84.0m, width 9.1m, depth 10.4m,
2. Standard displacement approximately 3,000t. Crew capacity approximately 70 people.
“Chogei” propulsion system:
1. A diesel engine and lithium-ion batteries are combined.
2. The main engine is diesel-electric propulsion, a single-shaft propulsion system with one propeller.
Construction is scheduled for April 19, 2022, and delivery is scheduled for March 2026.
“Chogei”‘s main equipment:
Detection capabilities and quietness have been dramatically improved.
1. Torpedo tubes are installed in the bow. In addition, a submarine combat management system and
2. A TCM (Torpedo Counter Measure) submarine torpedo defense system are installed.
Equipped with sonar devices (bow array, side array, towed array), etc.
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The new 3,000t diesel-electric submarine (SSK)：
which has been named Chogei (with pennant number SS 517),
October 4 , a ceremony held at MHI’s shipyard.following the fourth Taigei-class submarine “Raigei”.
The newly launched SSK will use the new Kawasaki 12V 25/31 diesel engines with high output power.
Chogei, which cost about 64.8 billion yen ($443 million) to build, is expected to enter service in March 2026.
According to the JMSDF：
the new submarine has a crew complement of about 70.
The Taigei-class features female-only compartments such as a living space for up to six women, according to the JMSDF.
New diesel engines：
１．Until the third Taigei-class submarine Jingei, Two Kawasaki 12V 25/25SB diesel engines were used as the main engines,
２．but Raigei started to use new Kawasaki 12V 25/31 diesel engines, with a high output power for the first time.
These new diesel engines ：
compatible with a new snorkel system with enhanced power generation efficiency.
It is unclear whether this will increase the shaft output of the Taigei-class, currently generating 6,000 horsepower, as well as a maximum speed underwater of 20 knots.
Lithium-ion batteries：
the Taigei-class is equipped with lithium-ion batteries in place of lead-acid ones,
just like the final two Soryu-class boats for the JMSDF: Oryu (SS 511) and Toryu (SS 512).
GS Yuasa：manufacturer of battery systems：
GS Yuasa a Kyoto-based developer provided the lithium-ion batteries for those new submarines.
So far Japan is the only country , known to have fitted lithium-ion batteries into SSKs,
Korean submarines：Dosan Ahn Chang-ho-class：
South Korea expected to be the next country to do so with all 3 KSS-III Batch-II submarines,
also known as Dosan Ahn Chang-ho-class submarines.
These vessels are scheduled to be commissioned from 2026.
New CMS and snorkel :
the Japanese MoD said, The class also employs
１．a new combat management system with advanced integrated sensors,
２．command-and-control, and weapon engagement systems,
an enhanced snorkel system：
In addition, it adopts an enhanced snorkel system to reduce signatures,
and a new-generation sonar system based on fiber-optic array technology to enhance detection capability.
Taigei-class SSK weapons： torpedo counter-measures system
The Taigei-class employs the same torpedo counter-measures system that has been incorporated into the last four Soryu-class boats.
１．It is expected to use Japan’s newest torpedo, which is called the Type 18, succeeding the previous Type 89.
２．The new torpedo will feature improvements in a number of areas, including propulsion, target detection, and processing.
a long-range standoff cruise missile：
The MoD in Tokyo is aiming to equip a new submarine succeeding the Taigei-class.
with a long-range standoff cruise missile,which can attack enemy ships from outside their missile range.
the Type 12 Surface-to-Ship Missile:
１．The type of missile being considered for installation is an improved version of the Type 12 Surface-to-Ship Missile,
２．based on the Japan Ground Self-Defense Force’s Type 12 Surface-to-Ship Missile,with an extended maximum range of about 1,500 km.
to attack enemy land bases : from long distances:
１．Until now, Japanese submarines have been equipped with the UGM-84L Harpoon Block II anti-ship missile,
２．but the new submarine-launched missile will be able to attack enemy land bases from long distances.