Type 039A submarine
|Builders:||Wuchang Shipbuilding, Wuhan|
|Operators:||People's Liberation Army Navy|
|Preceded by:||Type 039 (Song-class)|
|Displacement:||3,600 t (3,500 long tons) (submerged)|
|Length:||75 m (246 ft 1 in)|
|Propulsion:||Diesel-electric, 1 shaft, AIP|
|Speed:||20 knots (37 km/h; 23 mph)|
|Test depth:||400 m|
|Armament:||6 × 533 mm (21 in) torpedo tubes|
The Type 039A submarine (NATO reporting name: Yuan-class) is a class of diesel-electric submarine in China's People's Liberation Army Navy. It is China's first AIP powered submarine and presumed to be one of the quietest diesel-electric submarine classes in service. This class is the successor of the Type 039 submarine. The official Chinese designation is 039A as the ship is based on the 039 class, but as the 039A has very little resemblance to the 039 it is commonly referred to as the Type 041.
The Type 039A inherits the tail design of the Type 039 (NATO codename: Song class) with four diving planes and a single large shaft. The teardrop shaped hull and large sail suggest heavy Kilo influence. The teardrop shape also suggests a pressurized double hull design inherited from the Kilo. A pair of foreplanes are positioned in the middle of the sail. The submarine is equipped with indigenously developed cabin-raft (shock absorbers) system that helped to reduce noise level by over 35dB. Additionally, the submarine is covered with rubber anti-sonar protection tiles to reduce the risk of detection. A new improved "C" variant was also launched.
The Type 039A has six 533 mm torpedo tubes. These can be used to launch indigenous as well as Russian-made torpedoes. The general designer of the torpedo and missile launching system is Mr. Sun Zhuguo (孙柱国, 1937-). The Type 039A is also believed to be capable of launching YJ-8X (C-80X) series anti-ship missiles. The missile uses inertial + terminal active radar guidance. It carries a 165 kg time-delayed semi-armour-piercing high-explosive warhead, with a maximum range of 80~120 km and speed of Mach 0.9. The Type 039A is also capable of firing the CY-1 ASW missile under water, but the status of the missile is in question because nothing is heard about its production. The CY-1 ASW missile has a maximum range of 18 km (10 nm), and when using A244 or Mark 46 torpedo as a payload.
China was known to have imported the Thales TSM 2233 ELEDONE / DSUV-22 and Thales TSM 2255 / DUUX-5 from France during the 1980s and early 1990s. It also has access to a wide range of modern Russian sonar systems (MG-519 MOUSE ROAR, MGK-500 SHARK GILL) through its purchase of the Kilo Class. Comparable systems are expected to be installed for the Type 039A. It is likely to be fitted with a comparable surface/air search radar similar to the MRK-50 SNOOP TRAY, a commercial navigation radar like a Furuno unit observed on a number of SONG class and ESM system is comparable to the Type 921A.
According to the Chinese newspaper Science and Technology Daily (科技日报), this 039A class is equipped with an air-independent propulsion system developed by the 711th Research Institute of the China Shipbuilding Heavy Industry Group Corp. Referred as a "specialized engine" in official Chinese sources. The 711th Institute was founded in April 1963, but it was not until more than a decade later, in 1975, that it ventured into the field of air-independent propulsion systems by establishing an office for a "specialized engine," setting up a team of about a dozen researchers.
Currently the special engine research process, 711 Research Institute this as an opportunity to train a large number of technical backbone. From presiding at the beginning of the project, the team only if more than 10 people, which grew to more than 100 people. Emerging model of Shanghai, Shanghai Youth Science and technology and other advanced character of excellence, and that's what this team, was recognized as the people's Liberation Army General armament Department "researching advanced group", has twice been awarded the "Shanghai model workers collective".
By June 1996 that team had developed into the "specialized engine engineering research center"; by 2008 there were more than a hundred researchers. In 1998, the first experimental sample was built and a decade later and after a dozen technological breakthroughs, a wide range of matured versions became commercially available and the newest diesel-electric submarine in Chinese navy became the first customer. Although the official Chinese source had not mentioned the exact class of the submarine, it is generally accepted that the class is no other than Type 039A Yuan class, since it is the newest conventional powered submarine in the Chinese navy. The engine is built by Shanghai Qiyao Propulsion Technology Ltd. (上海齐耀动力技术有限公司), a wholly owned subsidiary of the 711th Institute.
The Yuan class SSK is integrated with advanced noise reduction techniques including anechoic tiles, passive/active noise reduction, asymmetrical seven-blade skewed propeller, the 039A is expected to be as quiet as other modern diesel/electric powered submarines, and therefore much more difficult to be tracked.
Chinese specific variants
A total of four variants of Type 039A have been developed by the first half of 2014, and they are listed here in chronological order based on their public debut:
- Type 039A: Original Yuan class. The most obvious external visual difference between Type 039A and its predecessor Type 039/039G Song class submarine is in the conning tower. The conning tower of Type 039A is similar to that of Type 039G, but the tower lacks the fin-shaped extrusion on the rear section of the conning towers of both the Type 039 and the Type 039G.
- Type 039AG: This second member of Type 039A series is frequently but erroneously identified as its development, Type 039B, because externally, the two version looks the same above waterline. The only difference lies below the waterline, which is not readily observed, and it's believed that all Type 039AG have been converted to Type 039B. The most obvious external visual difference between Type 039AG along with its development Type 039B and earlier Type 039A submarine is also in the conning tower: the shape edge at the top of conning tower of Type 039A is replaced with smooth round shape transition. In addition, there is a bulge in the middle of the smooth transition in the forward portion of the conning tower housing some kind of sensor, and this is a new feature earlier Type 039A lacks.
- Type 039B: This third member of Type 039A series looks identical to earlier Type 039AG from which it is developed from. The biggest difference between Type 039B and Type 039AG is that Type 039B has incorporated flank sonar array, which was subsequently retrofitted on Type 039AG and some earlier boats. This difference, however, is not readily observable because the flank array is installed at the lower portion of the hull. It was only in the early 2010s when a Type 039B built by Shanghai Changxing (长兴) Shipyard exposed in the berth, when the flank array of Type 039B became publicized, thus distinguish the type from earlier Type 039AG that lacked the flank sonar.
- Type 039C: The fourth variant of the Yuan has been first publicized in December 2013, with a modified hull and redesigned conning tower with extrusion at the root of the conning tower in both the bow and stern direction, similar to that of conning tower of Virginia-class submarine. In addition, the bulge housing unknown sensor on board Type 039B in the forward section of the top edge of the conning tower is absent on the new boat launched in April 2014, but there are three white lines at the top of edge of the conning tower on both sides, presumably for environmental sensors. This new boat is claimed to be Type 039C.
Export variant: S20
At IDEX-2013, China revealed a scaled-down version of Type 039A submarine designated as S20, specially intended for export. The main difference between S20 and Type 039A is that the AIP system on the original Type 039A is deleted, but can be available and easily integrated due to modular design of S20, if potential customers choose to purchase AIP systems separately. Due to its modular design, a variety of sensors and weapons can also be easily adopted up on customers' requests. Specifications of S20:
- Structure: double hulled
- Length: 66 meter
- Beam: 8 meter
- Draft: 8.2 meter
- Surface displacement: 1850 tons
- Submerged displacement: 2300 tons
- Maximum speed: 18 knots
- Cruise speed: 16 knots
- Range: 8000 nautical miles @ 16 knots
- Endurance: 60 days
- Crew: 38 total
- Maximum depth: 300 meters
- Pakistan Navy - In April 2015, Pakistan approved purchase of 8 S20 class from China for $5 billion for Pakistan Navy. The deal was finalised on 23 july 2015.  
- Royal Thai Navy - China won the bid to supply Thailand 3 Yuan-class submarine. According to official Thai news bangkokpost: "China beat other competitors as it offered subs equipped with superior weaponry and technology. Its subs are also able to stay underwater longer."
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- S20 Submarine
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