Yoon Youngha-class patrol vessel

	ROKS Hyun Sihak
Class overview
Name	Yoon Youngha class
Builders	Hanjin Heavy Industries, STX
Operators	Republic of Korea Navy
Preceded by	Chamsuri class
Subclasses	PKX-A(PKG) (Yoon Youngha class); PKX-B(PKMR);
Cost	₩48.8 billion; $37.7 million (constant 2009 USD);
In commission	2008–present
Planned	PKX-A(PKG): 18, PKX-B(PKMR): 16
Completed	PKX-A(PKG): 18, PKX-B(PKMR): 16
Active	PKX-A(PKG): 18, PKX-B(PKMR): 12
General characteristics (PKX-A(PKG))
Type	Patrol boat
Displacement	570 tonnes (561 long tons)
Length	63 m (206 ft 8 in)
Beam	9 m (29 ft 6 in)
Draft	3 m (9 ft 10 in)
Propulsion	Combined diesel and gas (CODAG); 2 × Hanwha Techwin/GE LM500 gas 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 × T.S Tech K-RBOC Mk36 chaff/flare dispenser; LIG Nex1 Sonata SLQ-200(V)K ECM/ECCM suite;
Armament	Hyundai Wia (after 3rd ship) 76 mm gun; S&T Dynamics 'No Bong' 40L/70K dual 40 mm gun; 4 × LIG Nex1 SSM-700K Hae Sung anti-ship cruise missile; 2 × S&T Dynamics K6 12.7 mm machine guns;
General characteristics (PKX-B(PKMR))
Type	Patrol boat
Displacement	200 tonnes (197 long tons)
Length	44 m (144 ft 4 in)
Beam	7 m (23 ft 0 in)
Propulsion	CODAG
Speed	40 knots (74 km/h; 46 mph)
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	LIG Nex1 Sonata SLQ-200(V)K ECM/ECCM suite
Armament	Hyundai Wia 76 mm gun ; 2 × S&T Dynamics K6 12.7 mm machine guns ; 12 launcher 130 mm guided rocket;

The Yoon Youngha-class patrol vessel (Hangul: 윤영하급 미사일고속함) 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 PKX-B class patrol boat (also known as Chamsuri-211-class patrol boat or Gumdoksuri-class patrol vessel).

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