Romeo class submarine
|Builders:||North Korea) - Assembly site of North Korean kits from China.|
|Preceded by:||Whiskey class submarine|
|Succeeded by:||Foxtrot class submarine|
|Displacement:||1,475 tons surfaced
1,830 tons submerged
|Length:||76.6 m (251 ft 3 in)|
|Beam:||6.7 m (22 ft)|
|Draught:||5.2 m (17 ft 1 in)|
|Propulsion:||Two diesels delivering 2.94 MW (4000 shp) with two electric motors driving two shafts.|
|Speed:||15.2 knots surfaced
13 knots submerged
|Range:||14,484km (9,000 miles) at 9 knots|
|Complement:||54 men (10 officers)|
|sonar and radar|
|Armament:||8 × 533mm (21in) torpedo tubes. Six located in the bows and two in the stern.
14 × 533mm (21in) anti ship or anti submarine torpedoes (including Yu-4 and Yu-1 torpedoes) or 28 mines
The Project 633 class (known in the West by its NATO reporting name as the Romeo class) is a class of Soviet diesel-electric submarine, built in the 1950s. At the end of World War II, the Soviets obtained several Type XXIs, from which they were able to obtain certain key technologies. These technologies assisted in the design of the Zulu- and Whiskey-class. Further improvements on the design led to the Romeo class, which was designed by Lazurit Central Design Bureau ("Lazurit" is the Russian word for lazurite).
By today's standards Romeo class submarines are considered obsolete, but they still have some value as training and surveillance vessels.
Several navies operate or have operated Romeo class submarines:
- Russia and the Soviet Union had 20 Romeo class vessels in service. These vessels are no longer used as combat vessels in the Russian Navy, although one or two remain in service as immobile training facilities.
- China has operated an estimated 84 of the Type-33 submarine (Romeo) during the Cold War. Most have been scrapped, but 13 are still in use for training.
- North Korea operates 22 (or 20) Romeo class submarines. Seven were directly imported from China between 1973 and 1975, and the remainder locally assembled with Chinese supplied parts between 1976 and 1995. One apparently sank in an accident in 1985. Four Chinese imported units are based on the western coast.
- Bulgaria operates one Romeo class submarine, which is the last remaining of four boats that were exported from the Soviet Union.
- Syria has decommissioned the three Romeo class submarines that it imported from the Soviet Union.
- Egypt operates four of an original eight Romeo class submarines that are upgraded variants of the Chinese design.
- Algeria has decommissioned its two Soviet Romeo class submarines.
Chinese Type 033 Romeo-class and its variants
Under the 1950 Sino-Soviet Friendship and Mutual Assistance Treaty, the Soviets passed to China (and later to North Korea) the documentation necessary to produce Romeo submarines in 1963. The Chinese variant is known as the Type 033 Romeo. A total of 84 Type 033 submarines were built in China from 1962 to 1984, plus several exported to other countries. The Chinese Type 033 incorporated some improvements over the original Romeo, including noise reduction of 20 dB. Sonar on board was also continuously upgraded: the original Soviet sonar was first replaced by domestic Chinese Type 105 sonar, which consequently was replaced by H/SQ2-262A sonar built by No. 613 Factory. Today most of the Type 033 subs have been retired or preserved, with few remaining for training purposes. A total of six Chinese Romeo class submarine variants were developed:
- Type 6633: Original Chinese built Romeo, 6 were planned, but only 2 were completed. Originally planned as a Chinese assembled Romeo class, construction program came to a complete stop due to Sino-Soviet split, because former-USSR stopped the delivery of parts. Construction of the 3rd units at Wuhan stopped, and available parts were diverted to complete the first pair, but many parts had to be developed indigenously. The primary improvement of Type 6633 over the original Soviet boats is the use of domestic Chinese battery, which had slightly superior performance than the original Soviet battery.
- Type 033: Complete domestic production in China was achieved in 1967, and subsequently renamed as Type 033. However, experience from deployment of completed boats in warmer climate proved that the original Soviet refrigeration and air conditioning system designed for subarctic and arctic area was woefully inadequate for subtropical and tropical regions, so redesigns were needed to improve refrigeration and air conditioning systems, and all boats to be stationed in tropical and subtropical regions went through such refit. In September 1969, brand new construction of Type 033 with improved air conditioning and refrigeration capability begun at Huangpu Shipyard in Guangzhou, eventually, 13 units were completed.
- ES5A: Upgrade Type 033, and improvements are mainly in the replacement of equipment of Soviet origin with domestic Chinese system, which includes: QZHA―10 (Type 779) attack periscope and QDYA―10 (Type 778) general purpose periscope. Addition of H/SQG-2 ranging sonar, Type 063 communication systems, and countermeasure systems. Domestic Chinese Type 801 sonar replaced the original Soviet MARS-24 sonar. The only difference between Type 801 sonar and its predecessor MARS-24 sonar is that there are 24 transducer elements for Type 801 as opposed to 12 in the original MARS 24, so the Chinese sonar had better accuracy. Domestic Chinese reconnaissance sonar H/SQZ-D sonar (with transducer designated as Type 105) replaced the original Soviet system, with performance of SQZ-D is almost identical to the original Soviet sonar it was developed from, except the sector of scan, which is increased by 15 degrees. Additional noise reduction measure also adopted. This is the type China originally sold to Egypt in the 1980s.
- Type 033G: Development of ES5A, with the incorporation of capability to launching acoustic homing torpedo, with analog computers added to achieve automation in order to speed up the calculation of torpedo fire control calculations that was previously requiring manual work. All Chinese Romeos have been converted to this standard. The NATO reporting name for this type is rumored to Wuhan class.
- Type 033G1: A single Type 033G was modified to carry 6 YJ-1 (CSS-N-4) SSM, this variant is called Type 033G1, with rumored NATO reporting name as Wuhan A. The missile had to be fired while the boat is surfaced, with the total exposure on the surface less than 7 minutes. The most significant improvement, however, is the reduction of noise level by 12 dB.
- ES5B: Development of Type 033G, primary intended for export. This is an upgrade package for Romeo submarine users. The primary improvement of this class is the ability to launching wire guided torpedoes and anti-ship missiles (AShM) while submerged. Program originally begun in the mid-1980s, and Egypt is reported to be the only customer when China won a contract to upgrade its Romeo-class submarine fleet, including both the Soviet built and Chinese built units. This is the last type of Chinese Romeo class submarine, with noise reduction of 20dB to 140 dB in comparison to the 160 dB of the original Soviet Project 633 former-USSR delivered to China (in kits forms).
The Encyclopedia Of Warships, From World War 2 To The Present Day, General Editor Robert Jackson.
- Figures about the Romeo class
- Globalsecurity.org (Type 033 Romeo)
- Globalsecurity.org (Type 033G Wuhan)
- Globalsecurity.org (Type 035 Ming)
- Sino Defense Today (Type 033 Romeo)
- Sino Defense Today (Type 035 Ming)
- Soviet Romeo class submarines - Complete Ship List (English)