Sejong the Great-class destroyer

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ROKS Sejong the Great (DDG-991)
Class overview
Builders
  • Hyundai Heavy Industries
  • Daewoo Shipbuilding & Marine Engineering
Operators Republic of Korea Navy
Preceded byChungmugong Yi Sun-sin class
Succeeded byKDDX-class destroyer
Cost$923 million[1]
Planned6
Building2
Completed4
Active3
General characteristics
TypeGuided-missile destroyer
Displacement
  • 7,650 tons standard displacement
  • 10,600 tons full load
LengthBatch 1 166 m (544 ft 7 in), Batch 2 170 m (557 ft 9 in)
Beam21.4 m (70 ft 3 in)
Draft6.25 m (20 ft 6 in)
Propulsion
  • 4 ×
    COGAG
    ;
  • 2 × shafts;
  • 100,000 shp (75,000 kW) produced power
Speedexceeds 30 knots (56 km/h; 35 mph)
Range5,500 nmi (10,200 km; 6,300 mi)
Endurance30 days
Complement300
Sensors and
processing systems
  • AN/SPY-1D(V) multi-function radar
  • AN/SPG-62 fire control radar
  • DSQS-21BZ-M hull-mounted sonar
  • SQR-220K towed array sonar system
  • Sagem Infrared Search & Track (IRST) system
Electronic warfare
& decoys		LIG Nex1 SLQ-200K Sonata
electronic warfare
suite
Armament
  • Batch I:
  • 1 ×
    5-inch (127 mm)/L62 caliber Mk 45 Mod 4
    naval gun
  • 1 × 30 mm Goalkeeper CIWS
  • 1 × RAM Block 1 CIWS
  • 16 ×
    SSM-700K Haeseong
    anti-ship missile
  • 2 × triple torpedo tubes for:
    • K745 Blue Shark torpedo
  • 1 × 48-cell, 1 × 32-cell (80 cells) Mk 41 VLS for:
  • 1 × 48-cell K-VLS for:
    • K-ASROC Red Shark
    • Hyunmoo III
      land attack cruise missiles
    • K-SAAM short range air defence missiles
    • KM-SAM air defence missiles
  • Batch II:
  • 1 × 5-inch (127 mm)/L62 caliber Mk 45 Mod 4
  • 2 × 20mm Block 1B Phalanx CIWS
  • 8 × SSM-700K Haeseong anti-ship missile
  • 2 × triple torpedo tubes for:
    • K745 Blue Shark torpedo
  • 1 × 48-cell Mk 41 VLS for:
  • 1 × 16-cell K-VLS for:
    • K-ASROC Red Shark
    • Hyunmoo III land attack cruise missiles
    • K-SAAM short range air defence missiles
    • KM-SAM air defence missiles
  • 1 × 24-cell K-VLS II for:
    • L-SAM long range air defence missiles
Aircraft carried2 ×
SH-60 Seahawk
Aviation facilitiesHangar and helipad

The Sejong the Great-class destroyers (Sejongdaewang-Geup Guchukam or Hangul: 세종대왕급 구축함, Hanja: 世宗大王級驅逐艦), also known as KDX-III, are three guided-missile destroyers of the Republic of Korea Navy (ROKN).[2]

Hull name

On 20 April 2007,

Joseon Dynasty of Korea. He is credited with the creation of the indigenous Korean system of writing.[3]

Background

The Sejong the Great class is the third phase of the South Korean navy's Korean Destroyer eXperimental (KDX) program, a substantial shipbuilding program, which is geared toward enhancing ROKN's ability to successfully defend the maritime areas around South Korea from various modes of threats as well as becoming a blue-water navy.[4]

At 8,500 tons standard displacement and 11,000 tons full load, the KDX-III Sejong the Great destroyers are the largest destroyers in the South Korean Navy and larger than most destroyers in the navies of other countries.

destroyers.[1] KDX-III are currently the largest ships to carry the Aegis combat system.[6]

Armaments

Sejong the Great-class destroyers' main gun is the

127 mm/L62 Mk 45 Mod 4 naval gun, an improved version of the same gun used on other warships from several other nations. Point-defense armaments include one 30 mm Goalkeeper CIWS and a RIM-116 Rolling Airframe Missile Block 1 21-round launcher, the first Aegis platform to carry RAM.[7] Anti-aircraft armament consists of SM-2 Block IIIA and IIIB[8] in 80 total Mk 41 VLS
cells. Block IIIB has added infrared (IR) induction mode to Block IIIA, improving interception capability.

K745 LW Cheong Sang-uh (Blue Shark) torpedoes. Anti-ship capability is provided by 16 SSM-700K Hae Sung (Sea Star) long-range anti-ship missiles, each with performance similar to the U.S. Harpoon. It is equipped on a navy ship that is built after the late KDX-II destroyers. Land-attack capability is provided by the Hyunmoo III cruise missile.[4]

Missile batteries

Capabilities

The ship features the Aegis Combat System (Baseline 7 Phase 1) combined with AN/SPY-1D(V) multi-function radar antennae.[9][4] This gives the destroyers the ability to track missiles launched from anywhere in North Korea. This capability was demonstrated by the tracking of a North Korean missile in April 2009.[10]

The Sejong the Great-class destroyers are often compared to the Arleigh Burke and Atago classes because they utilize the AN/SPY-1D multi-function radar, and have similar propulsion and capabilities. One notable difference between the Sejong the Great-class ships and Arleigh Burkes is the number of

VLS cells. Destroyers of the Sejong the Great class have a capacity of 128 missiles, as opposed to 96 on the Arleigh Burke class and the Japanese Atago-class destroyers. The Sejong the Great class is thus one of the most heavily armed ships in the world,[11] with greater missile capacity than the Chinese People's Liberation Army Navy Type 055 destroyer[12] (112 VLS cells). The Sejong the Great class is surpassed in VLS depth only by the Kirov-class battlecruiser with 352 missiles (entire missile load).[13]

Another similarity to Arleigh Burke Flight IIA and Atago-class destroyers is the presence of full facilities for two helicopters,[1] a feature missing from earlier Arleigh Burke[14] and Kongō-class destroyers.[15]

BMD

In August 2016, press reports revealed that South Korea was considering adding the

U.S. Army ground-based missile interceptors on the peninsula, likely being outfitted with the SM-3. While the first three destroyers are fitted with Aegis Baseline 7 based on older proprietary computers that can't carry out IAMD operations, the following three will be fitted with the Baseline 9 version of the Aegis Combat System that combines modern computing architecture to allow the AN/SPY-1D(V) radar to perform air warfare and BMD missions at the same time.[17]

Ships in the class

Name Pennant number Builder Launched Commissioned Status
Batch I
ROKS Sejong the Great (Korean: 세종대왕함) DDG-991 Hyundai Heavy Industries 25 May 2007 22 December 2008 Active
ROKS Yulgok Yi I (Korean: 율곡 이이함) DDG-992 Daewoo Shipbuilding & Marine Engineering 14 November 2008 31 August 2010 Active
ROKS Seoae Ryu Seong-ryong (Korean: 서애 류성룡함) DDG-993 Hyundai Heavy Industries 24 March 2011 30 August 2012 Active
Batch II
ROKS Jeongjo the Great (Korean: 정조대왕) DDG-995 Hyundai Heavy Industries 28 July 2022 Launched

On 10 October 2019, HHI signed a deal to build the first of three 170m long, KDX-III Batch II Aegis destroyers for the Republic of Korea Navy. The Sejong the Great class is KDX-III Batch-I, and Korean Navy is planning 3 ships of KDX-III Batch-II.[18] Under the deal, HHI will deliver the first ship by November 2024.[19]

See also

References

  1. ^ a b c "Sejong the Great Class Guided Missile Destroyer". Military Today. Archived from the original on 15 January 2024. Retrieved 26 December 2022.
  2. ^ "ROK (Republic of Korea) Navy to increase KDX-III Aegis destroyers to six by 2027". Navy Recognition. 11 December 2013. Archived from the original on 12 December 2013. Retrieved 12 December 2013.
  3. ^ Kim-Renaud, Young-Key (Spring 2000). "Sejong's Theory of Literacy and Writing" (PDF). Studies in the Linguistic Sciences. 30: 13–45 – via CORE.
  4. ^ a b c "Sejong the Great (Sejongdaewang) class Destroyer - KDX-III". Navy Recognition. Archived from the original on 13 October 2023. Retrieved 26 December 2022.
  5. ^ "Koreas KDX-III AEGIS Destroyers". Defense Industry Daily. 11 June 2015. Archived from the original on 11 December 2009. Retrieved 8 March 2010.
  6. ^ "Aegis Weapon System Verified During Korean Navy Ship Trials". Defence Talk. 2 August 2010. Archived from the original on 5 December 2010. Retrieved 21 October 2010.
  7. ^ "KDX-III / DDH-III Sejongdaewang". deagel.com. Archived from the original on 7 October 2006. Retrieved 7 April 2009. These ships will be the world's first combining proven AEGIS and RAM.
  8. ^ "Republic of Korea - SM-2 Standard Missiles" (PDF). Defense Security Cooperation Agency. 26 May 2009. Archived from the original (PDF) on 27 May 2011. Retrieved 27 June 2009.
  9. ^ LaGrone, Sam (6 September 2016). "New South Korean Destroyers to Have BMD Capability". U.S. Naval Institute. Archived from the original on 1 October 2023. Retrieved 26 December 2022.
  10. ^ "Korea Launches 3rd Aegis Destroyer". The Chosun Ilbo. 25 March 2011. Archived from the original on 14 June 2012. Retrieved 10 May 2012.
  11. ^ Burleson, Mike (25 May 2010). "South Korean Naval Plight Our Own". New Wars. Archived from the original on 28 October 2011. Retrieved 10 November 2011.
  12. ^ Mizokami, Kyle (24 October 2016). "China's New Guided Missile Destroyer To Be Its Biggest Yet". Popular Mechanics. Archived from the original on 6 December 2016.
  13. ^ "Kirov Class". Military Today. Archived from the original on 15 January 2024.
  14. ^ Pike, John (2 November 2016). "DDG-51 ARLEIGH BURKE-class - Navy Ships". Military Analysis Network. Archived from the original on 27 September 2023. Retrieved 26 December 2022.
  15. ^ "Kongo class". Weaponsystems.net. Archived from the original on 5 February 2023. Retrieved 26 December 2022.
  16. ^ LaGrone, Sam (15 August 2016). "South Korea Wants BMD Capability for Guided Missile Destroyers". U.S. Naval Institute. Archived from the original on 15 August 2016.
  17. ^ LaGrone, Sam (6 September 2016). "New South Korean Destroyers to Have Ballistic Missile Defense Capability". U.S. Naval Institute. Archived from the original on 1 October 2023.
  18. ^ "Hyundai Heavy bags 677 bln-won deal to build upgraded Aegis destroyer". Yonhap News Agency. 10 October 2019. Archived from the original on 31 December 2021. Retrieved 10 October 2019.
  19. ^ Vavasseur, Xavier (11 May 2020). "South Korea's Mid-Term Defense Procurement Plan Largely Unaffected By COVID-19 Crisis". Naval News. Archived from the original on 21 May 2023.

External links

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