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History
South Korea
Name	Seoul (서울)
Namesake	Seoul
Builder	Hyundai
Launched	11 November 2019
Commissioned	July 2021
Identification	Pennant number: FFG-821
Status	Active
General characteristics
Class and type	Daegu-class frigate
Displacement	2,800 tonnes (2,756 long tons) light 3,592 tonnes (3,535 long tons) full load
Length	122 m (400 ft)
Beam	14 m (46 ft)
Draft	4 m (13 ft)
Propulsion	Combined diesel-electric or gas 1 × Rolls-Royce MT30 gas turbine 4 × MTU 12V 4000 M53B diesel engine 2 × Leonardo DRS electric motors
Speed	30 knots (56 km/h; 35 mph) (max) 18 knots (33 km/h; 21 mph) (cruising)
Range	4,500 nautical miles (8,000 km)
Complement	140
Sensors and processing systems	SPS-550K air search 3D radar SPG-540K fire control radar SQS-240K hull-mounted sonar SQR-250K towed array sonar system SAQ-540K EOTS Hanwha Systems SAQ-600K IRSTs Naval Shield Integrated Combat Management System
Electronic warfare & decoys	LIG Nex1 SLQ-200(V)K Sonata electronic warfare suite SLQ-261K torpedo acoustic counter measures MASS decoy launchers
Armament	1 × 5 inch (127 mm)/L62 caliber Mk 45 Mod 4 naval gun 1 × 20 mm Phalanx CIWS 2 × triple torpedo tubes for K745 Blue Shark torpedo 8 × SSM-700K Haeseong Anti-ship Missile 16-cell K-VLS for: Haegung K-SAAM quadpacked in 4 per cell Haeryong VL-Tactical Land Attack Missiles K-ASROC Red Shark
Aircraft carried	Super Lynx or AW159 helicopter
Aviation facilities	Flight deck and enclosed hangar for one medium-lift helicopter

ROKS Seoul (FFG-821) is the third ship of the Daegu-class frigate in the Republic of Korea Navy. She is named after the capital, Seoul.

Development

Daegu-class is an improved variant of the Incheon-class frigate. Modifications to the Incheon-class include a TB-250K towed array sonar system and a 16-cell Korean Vertical Launching System (K-VLS) that is able to deploy the K-SAAM, Hong Sang Eo anti-submarine missile, and Haeryong tactical land attack cruise missiles.

The hull design is generally based on the one of the Incheon-class. However, as a part of weapon system modifications, the superstructure has been significantly changed. The hangar and a helicopter deck on stern has been enlarged to support the operation of a 10-ton helicopter.

Construction and career

ROKS Seoul was launched on 11 November 2019 by Hyundai Heavy Industries and expected to be commissioned in 2021.

References

1. ROK Navy Launches New Warship Capable of Hitting Targets Inside North Korea - Thediplomat.com, 9 June 2016
2. "Koreas New Coastal Frigates: the FFX Incheon Class".
3. South Korea Orders Two Daegu-class FFX-II Frigates Ahead of Schedule to Support Shipbuilder - Navyrecognition.com, 21 December 2016
4. "Hyundai Heavy launches South Korea's third Daegu-class frigate ROKS Seoul". Naval Today. 2019-11-15. Retrieved 2021-07-06.

v t e   Commissioned ships of the Republic of Korea Navy
Submarines	Dosan Ahn Changho-class SS Dosan Ahn Changho Ahn Mu Shin Chae-ho Sohn Won-yil-class SS Sohn Won-yil Jeong Ji An Jung-geun Kim Jwa-jin Yun Bong-gil Yu Gwan-sun Hong Beom-do Lee Beom-seok Shin Dol-seok Jang Bogo-class SS Jang Bogo Yi Cheon Choe Museon Park Wi Lee Jongmoo Jung Woon Yi Sun-sin Na Dae-yong Yi Eokgi Dolgorae-class SSM Dolgorae 051 Dolgorae 052 Dolgorae 053
Destroyers	Sejong the Great-class DDG Sejong the Great Yulgok Yi I Seoae Ryu Seong-ryong Jeongjo the Great Chungmugong Yi Sun-sin-class DDH Chungmugong Yi Sun-sin Munmu the Great Dae Jo-yeong Wang Geon Gang Gam-chan Choe Yeong Gwanggaeto the Great-class DDH Gwanggaeto the Great Eulji Mundeok Yang Man-chun
Frigates	Daegu-class FFG Daegu Gyeongnam Seoul Donghae Daejeon Pohang Cheonan Chuncheon Incheon-class FFG Incheon Gyeonggi Jeonbuk Gangwon Chungbuk Gwangju Ulsan-class FF Chungnam Masan Gyeongbuk Jeonnam Jeju Busan Cheongju
Corvettes	Pohang-class PCC Jinhae Wonju Andong Bucheon Seongnam Jecheon Daecheon Sokcho Yeongju Namwon Gwangmyeong Sinseong Gongju
Patrol vessels	Yoon Youngha-class PKG Yoon Youngha Han Sanggook Jo Chunhyung Hwang Dohyun Suh Hoowon Park Donghyuk Jung Geungmo Ji Deokchil Lim Byeongrae Hong Siuk Hong Daeseon Han Munsik Kim Changhak Park Dongjin Kim Soohyun Jeon Byeongik Lee Byungchul Chamsuri 211-class PKMR Chamsuri 211 - 229 Chamsuri-class PKM Chamsuri 298 - 375
Amphibious warfare ships	Dokdo-class LPH Dokdo Marado Cheon Wang Bong-class LST Cheonwangbong Cheonjabong Ilchulbong Nojeokbong Go Jun Bong-class LST Gojunbong Birobong Hyangnobong Seonginbong Solgae 631-class LSF Solgae 631 Solgae 632 Solgae 633 Solgae 635 Solgae 621-class LSF Solgae 621 Solgae 622 Solgae 623
Mine warfare ships	Nampo-class MLS Nampo Wonsan-class MLS Wonsan Yangyang-class MSH Yangyang Ongjin Haenam Ganggyeong-class MHC Ganggyeong Gangjin Goryeong Gimpo Gochang Gimhwa
Auxiliary ships	Soyang-class AOE Soyang Cheonji-class AOE Cheonji Daecheong Hwacheon Pyeongtaek-class ATS Pyeongtaek Gwangyang Tongyeong Cheonghaejin-class ASR Cheonghaejin Singiwon-class AGS Singiwon Sinsegi-class AGS Sinsegi Dadohae-class ASL Dadohae Mulgae 87-class LCU Mulgae 87 - 91 Mulgae 79-class LCU/L Mulgae 83 - 86

• 2019 ships
• Daegu-class frigates
• Ships built by Hyundai Heavy Industries Group