Gumdoksuri-class patrol vessel

ROKS Hyun Sihak (PKG 718)
Class overview
Builders:	Hanjin Heavy Industries, STX
Operators:	Republic of Korea Navy
Preceded by:	Chamsuri-class patrol vessel
Subclasses:	PKG-A (Yoon Youngha class) PKG-B
Cost:	₩48.8 billion $37.7 million (constant 2009 USD)
In commission:	2008 - present
Building:	PKG-B: 1
Planned:	PKG-A: 18, PKG-B: 24
Completed:	PKG-A: 18
Active:	PKG-A: 18
General characteristics (PKG-A)
Type:	Patrol boat
Displacement:	570 tonnes (561 long tons)
Length:	63 m (206 ft 8 in)
Beam:	9 m (29 ft 6 in)
Propulsion:	Combined diesel and gas (CODAG) 2 × Hanwha Techwin/GE LM500gas turbine 4,570 kW (6,130 hp) 2 × Doosan/MTU 12V 595 TE903,240 kW (4,340 hp) (711) 2 × STX/MTU 16V 1163 TB93 5,920 kW (7,940 hp) (712~733) 3 × Doosan Heavy Industries waterjets
Speed:	44 knots (81 km/h; 51 mph)
Range:	1,998 nmi (3,700 km) at 15 kn (28 km/h; 17 mph)
Complement:	40
Sensors and processing systems:	STX RadarSys SPS-100K surface search radar LIG Nex1 SPS-540K 3D surveillance radar Saab CEROS 200 Fire Control Radar and optronic sight Hanwha systems electro-optical targeting system
Electronic warfare & decoys:	2 × S&T Dynamics KDAGAIE Mk 2 chaff/flare dispenser LIG Nex1 Sonata SLQ-200(V)K ECM/ECCM suite
Armament:	Hyundai Wia (after 3rd ship) 76mm gun S&T Dynamics 'No Bong' 40L/70K dual 40mm gun 4 ×LIG Nex1 SSM-700K Hae Sung anti-ship subsonic speed missile LIG Nex1 Chiron MANPADS 2 ×S&T Dynamics K6 12.7 mm machine guns
Armor:	defence 7.62×39mm AK-47 in 10m
General characteristics (PKG-B)
Type:	Patrol boat
Displacement:	200 tonnes (197 long tons)

The Gumdoksuri class patrol vessel (Hangul: 검독수리급 고속함) also known as PKG class patrol vessel is a class of patrol ship of the Republic of Korea Navy. One variant is in active service and a smaller variant is planned. The first being the PKX-A or Yun Youngha class missile patrol ship (Hangul: 윤영하급 고속함), and the second the patrol boat (also known as Chamsuri-211 class patrol boat).

The Republic of Korea Navy began development of the PKG class in 2003 after a Chamsuri class (PKM class) patrol boat was sunk during a naval clash with North Korean patrol boats on June 29, 2002. The codenamed PKX (Patrol Killer eXperimental) program is the patrol boat modernization project of the ROK Navy.

The PKX consist of two main designs. The larger, missile armed PKG-A of approximately 500 tons and the smaller gun armed PKG-B of approximately 200 tons. PKG-A is planned to take up some of the operations done by Pohang class corvettes, and the PKG-B is planned to replace the aging Chamsuri-class patrol vessel fleet.

The first PKG-A vessel were ordered from Hanjin Heavy Industries. The lead ship of the class, Yoon Youngha (PKG 711), named after Lieutenant Commander Yoon Youngha who was killed during the second battle of Yeonpyeong, was launched on June 28, 2007 and commissioned on December 17, 2008. The production of the PKG-A are being divided between Hanjin Heavy Industries and STX in lots of four.

The PKX-B variant includes a 130 mm guided rocket launcher at the stern. The first vessel was launched in July 2016 and will be commissioned in late 2017; all four ships in the first batch will be delivered by the end of 2019. A contract was awarded to Hanjin Heavy Industries for ships 5-8 in June 2017, which are scheduled to be delivered after 2020. The contract for ships 9-12 will be awarded in early 2018.

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Wikipedia