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Fast Patrol Boat (PKX) Gumdoksuri
Guided Missile Patrol Killer (PKG)

The Republic of Korea Navy has developed a new Fast Patrol Boats program (PKX), most of which will be deployed near the inter-Korean maritime border. The new vessels, armed with sophisticated ship-to-ship guided missiles and an integrated surface-to-air/fire-control system, will replace the 150-ton Chamsuri models. The newly ordered vessels displace 440 tons, and are 63 meters long and 9 meters wide. They have a maximum speed of 74 kilometers per hour with a crew of 40, and are also loaded with 76-mm and 40-mm guns and cutting-edge radar systems.

Initially, it was reported that the Navy planned to procure a total of some 40 vessels by 2010. As of 2005 South Korea planned to have 32 PKM-X-project new-construction guided-missile patrol boats in service by the end of the decade. Little other information had been announced on in-service dates for this class, which was being built by Kangnam shipyard in Pusan. Subsequently, it was reported that the PKX project planned to commission 20 PKG (Patrol Killer, Guided Missile) class high-speed vessels by 2015.

The Gumdoksuri class high-speed vessel, also known as the PKX (Patrol Killer experimental) class, are the Navy's newest patrol vessels to replace the aging Chamsuri class patrol ships. The Navy began development of the PKX class in 2003 after a Chamsuri class was sunk during a deadly skirmish with invading North Korean patrol boats on June 29, 2002, in the Yellow Sea. They will be deployed to the Northern Limit Line (NLL), which has served as the de facto maritime border between the two Koreas. The new PKX boats will defend national interests in the ocean, as well as boost the economy and foster defense industries in Korea.

On June 30, 2005 GE Transportation announced it will supply Samsung Techwin, the Republic of Korea (ROK), with several GE LM500 aeroderivative marine gas turbine kits. Once assembled and tested by Samsung Techwin, the LM500 marine gas turbines will be used to power the ROK Navy's next generation PK(X) patrol boats. "We are delighted that the LM500 gas turbine will be part of the propulsion system for these next-generation vessels," said Karl Matson, general manager of GE Transportation's marine business, Evendale, Ohio. Noted Matson, "We are also excited that we have expanded our long-standing relationship with Samsung Techwin for this project, whereby Samsung Techwin will locally manufacture selected parts of the LM500 and assemble and test the completed engines at their factory in Changwon, Korea." Each of the PK(X) patrol boats will use two LM500 gas turbines, rated at approximately 5,600 shaft horsepower, in a COmbined Diesel And Gas turbine (CODAG) arrangement, with two MTU diesel engines. The LM500 is derived from GE's TF34 turbofan aircraft engine, and has 90% commonality with the CF34 engine that powers the popular CRJ100/200 regional jet with more than 14 million hours of operation.

By 2007 DAVIS had completed the design and manufacture of the complete exhaust systems for the LM500 gas turbine propulsion engines on the ROKN PKX patrol vessel. Each exhaust system incorporates a sea water injection (SWI) system which cools both the exhaust duct metal and plume, providing effective IR signature reduction. The exhaust systems exit the ship through the hull and were designed to ensure that the backflow of sea water into the duct from rough seas does not adversely affect engine performance.

On 28 June 2007, the Yoon Young-ha (PKG 711), the lead ship of her class, was launched at the shipyard of Hanjin Heavy Industries in Busan. The first of the group, named after late Navy lieutenant commander Yoon Young-ha, was commissioned on 17 December 2008 at Jinhae naval base, some 450 kilometers south of Seoul. The Navy commissioned the first of its next-generation high-speed patrol boats after 19 months of sea trials. Six South Korean soldiers, including Lt. Cdr. Yoon, were killed and 18 others wounded in a naval clash with North Korea in 2002 in the Yellow Sea. More than 30 North Korean soldiers were killed or wounded. After the incident, the South Korean Navy has come up with plans to improve maritime combat systems under the PKX project, which aims to replace old patrol boats.

DAPA awarded STX Shipbuilding a contract in 2007 to build the following four PKG ships. As of mid-2007 these four boats were under construction by the shipbuilder STX.

In December 2008 Hanjin Heavy Industries and Construction won a bid to build four new high-speed patrol boats for the Navy to replace its aging models. Hanjin nudged out two other competitors in the contract for the patrol boats, equipped with guided missiles, under the PKX program. Hanjin will build this next group of four, with the new patrol boats are expected to be launched in 2011.

DAPA and ADD started developing in 2003 with an independent technology combat system to be loaded on PKG, which is a substitute fighting power of the high-speed boat in operation in the Navy, and successfully completed research and development on 01 December 2008. The combat system for guided missile and high-speed boat consists of a sensor system of search radar, EOTS and tracking radar and a command and arming control system. The search radar that was developed for the first time in this country can detect and identify over 100 targets, and the electronic optical tracing system and tracking radar have target tracking functions. The command and arming control system was developed by using an open-type structure that applied the commercial communication middleware, which is an international standard according to the recent technological development trend, and the shooting control algorithm that was developed by ADD.

In November 2008, its excellence was proved by the hit ratio higher than the present operation system in the anti-ship and anti-aircraft shooting through military-operated test and evaluation, and thereby signifying that ROK defense science and technology has entered into an advanced country level also in the combat system that had high dependency on foreign technology. By succeeding in domestic development of the combat system, function expansbility will be easy for performance improvement in future, and ROK provided a foundation for developing even the combat system for submarine as well as next-generation battle ship and it has become a big opportunity for improving the fighting power of the navy. Also, economic spill effects resulting from this will be an import substitution effect of 57.6 billion won and a reduction in operation and maintenance cost of more than 14.42 billion won, and creation of jobs of domestic companies, and overseas export is also expected through excellent performance and price competitiveness.

PKX-B (Patrol Killer Experimental B) PKMR Chamsuri

The RoKN must be prepared to execute multiple complex missions before, during, and after the outbreak of general hostilities with North Korea, such as countering the KPNs East and West Fleets, which operate naval assets including nearly 300 fast attack craft with some of these missile-carrying platforms. The service will benefit from 18 new PKX-A missile boats, as well as 16 PKX-B Batch 1 and 18 PKX-B Batch 2 patrol boats, which are replacing its Chamsuri and Gumdoksuri-class patrol vessels.

On October 30, 2017, the South Korean Navy was handed over the lead rocket and artillery boat of the new type PKX-B (Patrol Killer Experimental B) PKMR 211 Chamsuri-211. The boat was built by the enterprise of the South Korean Shipbuilding Corporation Hanjin Heavy Industries and Construction (HHIC) in Busan and will be the lead in a large series.

The PKX-B was specifically designed to counter North Korean fast swarming craft. The PKX-B variant includes a 130 mm guided rocket launcher at the stern. The 12-canister 130 mm guided rocket launcher can hit targets between 320 km (1.912.4 mi; 1.610.8 nmi) using a rocket weighing 80 kg (180 lb) with an 8 kg (18 lb) warhead. Rockets have GPS/INS midcourse guidance with data uplink and terminal IIR homing, and three can be fired simultaneously. 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 was to be awarded in early 2018. South Korea is continuing to modernise its patrol boat fleet via an approximately $225 million contract with Hanjin Heavy Industries and Construction (HHIC), according to an announcement from the Defense Acquisition Program Administration (DAPA) on 28 June. The agreement encompassed four additional 210t Gumdoksuri-class fast attack craft.

Unlike RKH-A, the boat RKH-B has a full displacement of about 300 tons (instead of 570 tons), length 44.7 m, width 7 m and draft 2.4 m (instead of length 63 m, width 9 m and draft 3 m at RCCH-A). Combined diesel-gas turbine power plant type CODAG boats RKH-B includes one (instead of two at RKX-A) afterburner gas turbine General Electric LM 500 with a capacity of 6000 hp (Hanwha Techwin assemblies) and two Caterpillar Marine C32 mid-flight diesel engines that drive three Jet Power water jets (the latter are manufactured under license from the South Korean company Krosys). The power plant consists of two diesel generators Caterpillar Marine C9. Full speed is 41 knots.

A feature of the PKX-B boat is its weaponry. Unlike PKX-A type boats, a PKX-B type boat does not carry anti-ship missiles. Arms of the RKH-B type are made up of a 76-mm universal automatic gun mount manufactured by Hunydai WIA, two remote-controlled Hanwha installations with 12.7-mm K6 machine guns, and a 12-gun launcher of 130-mm adjustable missiles with a stern firing range up to 20 km (and according to some information - up to 36 km). The latter system was jointly developed by LIG Nex1 (lead contractor), Hanwha and Doosan DST based on K33 long-range unguided rockets from the famous South Korean 130-mm ground-based MLRS K136, the missiles use GPS correction and an infrared guidance system in the final segment.

The PKX-B is equipped with Hanwha (previously Samsung Thales) ASBUs, STX RadarSys SPS-100K radars and LIG Nex1 SPS-540K radars, the Saab CEROS 200 fire control radars, the Hanwha electronic-passive detection system, the EBX LIG Nex1 Sonata SLQ- 200 (V) K and S & T Dynamics KDAGAIE Mk 2.

South Korean Navy plans extend to building at least 34 PKX-B type boats. In June 2015, the Defense Acquisition Program Administration (DAPA) procurement agency of the Ministry of Defense of the Republic of Korea issued a HHIC contract for the construction of the first four boats of this type (with an option for 12 more), the lead one of which is now delivered, and the delivery of the other three ( PKMR 212, 213 and 215 ) is expected by the end of 2019. In July 2017, the HHIC received a contract for the following four boats ( PKMR 216 - PKMR 219) with delivery starting from 2020, and in the beginning of 2018, the HHIC contract for the four following boats is expected.

In June 2015, Caterpillar Marine confirmed receipt of a contract for the supply of C32 and C9 diesel engines to South Korea for 16 boats of new construction. In turn, General Electric Corp. announced at the same time that it would supply LM 500 turbine kits and gearboxes for two series of a total of 34 boats of the PKH-B type. The turbines are assembled from the supplied kits by Hanwha Techwin (formerly Samsung Techwin).

LM500 gas turbines were selected to power the ROK Navys PKX-B patrol boat program. As of 2013 the potential gas turbine propulsion system value over the life of the 34-ship PKX-B program is approximately $400 million. The Korean naval, offshore and merchant, shipbuilding industry, the largest and most important in the world, has long since recognized the benefit that GEs experience and technology can deliverpartnering together for 30 years. GEs LM500 gas turbines will power the Republic of Korea Navys PKX-B patrol boat program. The LM500s will be manufactured in-country by Samsung Techwin. The PKX-B program is planned for 34 ships and each ship uses two LM500s. The existing 18 ships in the PKX-A program also are powered by two LM500s per ship.

The LM500s, rated at approximately 6,017 shaft horsepower (shp), will be configured into a combined diesel and gas turbine arrangement (CODAG) with two diesels. The PKX-A program is also powered by GE LM500 gas turbines. The potential gas turbine propulsion system value over the life of the 34-ship PKX-B program is approximately $400 million. The program will be conducted in two phases. Phase one is for 16 shipsets. After completion, Phase II will proceed according to ROK government procedures.

GEs LM500 marine gas turbines already power the ROK Navys PKX-A patrol boats. Each of the PKX-A boats uses two LM500 gas turbines, rated at approximately 5,600 shp, in a CODAG configuration. The first PKX Yoon Young-ha was launched at Hanjin Heavy Industries Busan, ROK, shipyard. The LM500 gas turbines are manufactured in-country by Hanwha Techwin (formerly Samsung Techwin), at its Changwon, Korea, facility. To date, Hanwha Techwin -- a GE Marine System Supplier -- has provided 36 LM500 gas turbine modules for the PKX program.

Continuing PKX-A program capabilities into the PKX-B program, Hanwha Techwin will locally manufacture selected parts of the LM500s, and assemble and test the completed engines. GE will provide support of the gas turbine, control, and reduction gear system to Hanwha Techwin, Hanjin Heavy Industries and Construction shipyard, and the ROK Navy throughout installation, sea trials and commissioning. The LM500 is derived from GEs TF34/CF34 turbofan aircraft engines, and has 90% commonality with the CF34 engine that powers the popular CRJ100/200 regional jet with more than 14 million hours of operation. The simple cycle LM500 is a two-shaft gas turbine consisting of a gas generator, a free power turbine and cold end drive capabilities.



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