Korea KSS (Chang Bo Go) Submarine program

Test7

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South Korea Launches Navy’s 2nd KSS III Submarine

Launching ceremony for the 2nd KSS III submarine.

South Korea’s Daewoo Shipbuilding & Marine Engineering (DSME) launched ROKS Ahn Moo (SS-085), the Navy’s second Dosan Ahn Changho-class (KSS III program) submarine, today.
The vessel will be commissioned in 2022. The first submarine of this class, ROKS Dosan Ahn Chang-ho, is currently undergoing sea trials.
The Navy plans to add nine KSS III submarines to its fleet by 2019.

The South Korean Ministry of Defense in December 2012 awarded DSME $1.56 billion to build two large conventional/diesel electric (SSK) KSS III Batch-I submarines. In November 2016, Hyundai Heavy Industries (HII) received a contract to build another boat of the first batch. Delivery of all three boats is scheduled for the end of 2023.
South Korea Launches Navy’s 2nd KSS III Submarine

Construction of the KSS-III Batch II project for Republic of Korea (ROK) Navy was approved in May 2019. Batch-II vessels will consist 3 hulls with some design changes. DSME was chosen in May 2016 to design and construct a KSS III Batch-II hull.


Batch-III will consists in the three remaining hulls with more advanced technologies.
KSS-III Batch 1 submarine has a displacement of over 3000 tons, has a length of 83.5 meters, a width of 9.6 meters, and a draft of 7.7 meters. Its maximum submerged speed is 20 knots, and the cruising range at economic speed is 10,000 nautical miles.

The crew consists of 50 sailors. The vessel is fitted with eight 533-mm torpedo tubes as well as 6x VLS (vertical launch system) tubes to accommodate a future cruise missile (Cheon Ryong with a range of 1,500 Km) in development by LIG Nex1 while the launchers would be provided by Doosan. Spanish INDRA will provide its electronic defense system (ESM) PEGASO, U.K.’s Babcock would design and manufacture the Weapon Handling Systems, French Safran will supply optronic masts for the class and ECA Group the steering consoles. The ship’s combat management system will be provided by Hanwha while flank array sonars will be supplied by LIG Nex1.

South Korea Launches Navy’s 2nd KSS III Submarine

Compared to the first batch, KSS III Batch II submarine are expected to have a longer hull (displacement approx.. 4000t), 10x VLS tubes (up from 6x), a greater level of South Korea systems and Lithium Ion batteries and High-Temperature Superconductor (HTS) motor technology for integrated full electric propulsion system.

 

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South Korea’s Daewoo Shipbuilding & Marine Engineering (DSME) has secured a KRW165 billion (USD151 million) contract to upgrade three more Chang Bogo (Type 209/1200)-class diesel-electric attack submarines operated by the Republic of Korea Navy (RoKN).

The Ministry of National Defense’s (MND’s) Kookbang Ilbo newspaper reported on 11 December that the contract award, which was announced by the country’s Defense Acquisition Program Administration, comes after DSME completed in 2019 the upgrade of three of the nine submarines of the class – Lee Eok Gi (pennant number SS 071), Na Dae Yong (SS 069) and Choi Moo Sun (SS 063) – as part of a KRW179 billion (USD164 million) deal signed in 2014.

No details were provided about which of the boats will be upgraded next or when the process will be completed.

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Lee Eok Gi is one of the three Chang Bogo-class submarines already upgraded by DSME. The company secured a contract in December to upgrade three more of these boats. (South Korean MND)

The first three submarines were retrofitted with, among other things, a new locally built combat management system, an improved target detection and tracking capability, and a towed-array sonar.

The Chang Bogo (also spelled Jang Bogo) class is 55.9 m long and 6.2 m wide. The first boat, which was built in Germany, entered service in 1993. The remaining eight boats were built locally by Daewoo.

Meanwhile, DMSE announced on 15 December that Dosan Ahn Chang-ho , the first KSS III (also spelled KSS-3)-class attack submarine on order for the RoKN had succeeded five days earlier in setting a new world record for the longest continuous operation among diesel-electric submarines.

 

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Military sources peep indigenous nuclear submarine​





Expectations are rising that the Korean military will announce the development of an indigenous nuclear submarine within the year, according to military sources who spoke on the condition of anonymity.

According to one source, military authorities submitted a required operational capability (ROC) assessment in the first quarter of this year regarding the possibility of developing a third batch of Jang Bogo-class submarines.

In the ROC assessment, the future Jang Bogo-class submarine is envisaged as being a 4,000-ton nuclear-powered submarine, whose tonnage would exceed 5,000 tons once crew and armaments are loaded.

The submarine would also be able to carry 10 submarine-launched ballistic missiles (SLBMs).

Information obtained by the JoongAng Ilbo further specified that the submarine would be 100 meters (328 feet) long and be able to maintain speeds over 25 knots, or 28.5 miles per hour, underwater.

Current incarnations of the Jang Bogo-class submarine employ diesel or electricity. While their use of an air-independent propulsion system (AIP) enables them to remain submerged for several days at a time, this is not as long as those of nuclear-powered submarines, which can remain underwater for up to 90 days.

The military source explained that they decided to develop a nuclear-powered version of the Jang Bogo-class submarine after assessing the need to carry out underwater surveillance on North Korea and other neighboring countries with speed and stealth without the need to re-surface and refuel constantly.

In their white paper on defense strategy for the near future (2021-25), military authorities previously refused to comment on the likelihood of developing a nuclear-powered submarine, only saying that the third batch of Jang Bogo-class submarines would displace 4,000 tons and that “it would not be appropriate to comment on their fuel source at the current stage.”

A government source with knowledge of defense development plans who spoke on the condition of anonymity told the JoongAng Ilbo, “Development of a light aircraft carrier and a nuclear-powered submarine is the most important weapons project in the eyes of the Moon Jae-in administration.

“While development of a light aircraft carrier is proceeding, nuclear-powered submarines remain a sensitive issue and are thus being pursued under the surface.”

The current design for the indigenous nuclear-powered submarine is a teardrop-shaped hull that gets more narrow as it moves toward a pointed stern.

Submersibles with this shape encounter less resistance underwater, allowing them to move more quickly and silently. The U.S. Navy's L.A.-class and Virginia-class nuclear submarines also have teardrop-shaped hulls.

Another government source said, “Overall, the [third batch of Jang Bogo-class submarines] will be developed to possess the same advantages of the L.A.-class, Virginia-class and French Schiff-class submarines.”

The Korean Navy currently deploys six SLBMs on board the Dosan Anchang, the first submarine of the Jang Bogo-class. The SLBM is an improved version of the Army's short-range ballistic missile (SRBM), the Hyunmoo-2B, which has a maximum range of 500 kilometers (311 miles).

The SLBMs deployed on the third batch of Jang Bogo-class of submarines are more likely to be a larger, heavier and longer-range version of missiles than the Hyunmoo-2B.

 

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The Republic Of Korea Navy, commonly known as the South Korean Navy, has launched the third and last of a new class of diesel-electric submarines.

The new submarine, which has been named the Shin Chae-ho (SS 086) was launched at the shipyard of Hyundai Heavy Industries Co. in the southeastern city of Ulsan on 28 September.

According to Yonhap, it is the third and the final of three Changbogo-III Batch-I submarines South Korea has been building with its own technologies under a 3.09 trillion won ($2.77 billion) project launched in 2007. All of them are capable of firing submarine-launched ballistic missiles (SLBMs).

The first Dosan Ahn Chang-ho submarine was launched in 2018 and was deployed last month, and the second one, the Ahn Mu, was launched in November last year and is expected to be delivered to the Navy around next year, officials said.

The 83.5-meter-long and 9.6-meter-wide latest submarine is capable of carrying 50 crewmembers and can operate underwater for 20 days without surfacing, officials of the Defense Acquisition Program Administration (DAPA) said, adding it is scheduled to be delivered to the Navy in 2024 after test operations.

“The submarine has a strong capability of deterring provocations as it can be equipped with SLBMs test-fired earlier this month,” the Navy said in a release. “Some 76 percent of its parts are locally produced, which allows for maintenance and other technological support in a timely manner.”

 

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This thread is dedicated to the KSS program, also called the Chang Bo Go program of the Korean Navy. KSS program started with the procurement of HDW 209-1200 procurement program, dubbed the KSS-I, of the late 80s and early 90s.

The first ships in KSS-I class were built by HDW in their Shipyard in Kiel. This was later followed by a knock down production of blocks and components packages from HDW by DSME and later a complete licensed production through ToT. KSS-I program was later followed by KSS-II, a licensed production program of Type 214 and KSS-II, an indigenous submarine designed with the expertise gained from the proceeding licensed production programs.
 

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South Korea’s 2nd KSS III Submarine Commissioned with ROK Navy​

South Korea’s DAPA (Defense Acquisition Program Administration) has announced that the second KSS-III Batch I submarine, ROKS Ahn Mu (SS-085), was commissioned with the Republic of Korea (ROK) Navy.

The event took place today at DSME’s (Daewoo Shipbuilding & Marine Engineering) Okpo shipyard.

DAPA said SS-085 Ahn Mu will conduct its first operational deployment in 2024 following an operational performance evaluation and training of the crew over the next eight month.

SS-085 Ahn Mu was named to honor one of the leaders of early-twentieth Korean nationalist movement against Imperial Japan. Following the keel laying ceremony on July 1, 2016, and the launching ceremony on November 10, 2020, amidst the peak of the pandemic, the vessel has now finally been delivered to ROK Navy where further trials are planned before its planned deployment in early 2024.

Dosan Ahn Chang-ho class submarines are the first submarines in the ROK Navy to be mostly built with indigenous technologies (76% local content according to DAPA). These submarines are equipped with 6x VLS (Vertical Launching System) cells, capable of carrying and launching Hyunmoo-IV-4 SLBM (Submarine-Launched Ballistic Missile), derivative of the successful Hyunmoo-missile family.

The submarine is 83.5m in length, 9.6m in width and 14.7m in height. It displaces 3,358 tons on the surface and 3,705 tons when fully submerged. It can sail at the speed of 20 knots, with a maximum cruise range of around 10,000 nautical miles. It also features AIP (Air-Independent Propulsion) system that allows the vessel to operate underwater more quietly for up to a few weeks of time.

Another notable feature of this submarine is the installation of six ATP (Air-Turbine Pump) torpedo launchers that have been previously installed on Royal Navy’s Astute-class and Spanish Navy’s S-80 Plus-class submarines. Babcock International, a British enterprise had a big role in implementing their technologies on KSS-III Batch 1 vessels.

The ATP allows for the quick acceleration of torpedoes and missiles when launched, while generating a relatively limited level of noise which reduces the chance of detection.

Rear Admiral Kim Tae-Hoon, director of the domestic submarine program at DAPA mentioned:

“By successfully commissioning ROKS Ahn-Mu today, we have proven our technical abilities on submarine building. Today’s commissioning will serve as a momentum to greatly improve the capabilities on upcoming submarines including KSS-III Batch II and III.”

Initial research for Dosan Ahn Changho-class submarines began as early as 2004, as part of the KSS-III program. DSME and HHI (Hyundai Heavy Industries), as well as other companies including Hanwha Defense and LIG Nex1 have been deeply involved in this project in various aspects, ranging from ship’s propulsion system to armaments. The first ship of the class, Dosan Ahn Changho (SS-083) successfully carried out an SLBM launch test back in 2021 under the supervision of then South Korean President, Moon Jae-In. Third and the last ship of KSS-III Batch 1, SS-086 Shin Chaeho will be delivered to ROK Navy in April 2024, according to local sources. It is the only boat in the same class to be built by HHI, the first two having been built by DSME.

Original article edited: correction of hull classification numbers and name spelling.

KSS-III Dosan Ahn Chang-Ho class SLBM SSK:


Edit: video changed
 
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Chocopie

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Promotion clip of submarine Li-Ion battery system by Hanwha Aerospace. First to be integrated in 3,600 t KSS-III Batch II SSKs right now under construction.

„World‘s best“? Korean marketing 😁

 

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K761 Tiger Shark heavy torpedo (범상어 어뢰)

Long-range, high-speed heavyweight torpedo of ROK Navy against surface ship and submarine targets.

Mass produced by LIG Nex1 (99% domestic parts) for 1,800t KSS-II class (Type 214) and 3,300t KSS-III attack submarines.

Range: 50+ km
Diameter: 533 mm
Length: 6.5 m
Mass: 1,619 kg
Max. speed: 55-60 knots (111 km/h)
Guidance: wire guided fibre optic cable, INS
Warhead: PBX explosive, proximity and impact fuze, classified weight
Targeting: active/passive acoustic (next gen piezoelectric single crystal sonar transducers), wake-homing feature

Propulsion: extremely noise-reduced 300kw class electric motor with high power Lithium polymer battery cells and pump jet propulsor
  • Anti-decoy/counter countermeasure system
  • Deep diving capability
  • High precision navigation including way-point tracking and prohibited area avoidance
  • Highly maneuverable with altered propeller speed at different points in trajectory
Price: $2.5 mil (3.3 billion KRW) per unit


Edit: data added
 
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Afif

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Is it company test firing or from Navy exercise?
 

Chocopie

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Mixed scenes from different clips throughout development: Qualification & certification tests, Live-fire tests from SSKs and SINKEX.

Tiger Shark is already deployed on KSS-II and KSS-III subs.
 
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urban mine

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Inside KSS-III. Since the president is 178 cm tall, you can roughly guess the height of the ceiling.
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That blue torpedo is the Tiger Shark.
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urban mine

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You can also compare it to KSS-II. For reference, President Moon is 172 centimeters tall. Compared to KSS-III, it looks a little narrow.
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