Buyan Class Corvettes (Project 21630), Russia
Project 21630 Buyan Class corvettes are in service with the Russian Navy. Three Buyan Class corvettes were built by JSC Almaz Shipbuilding in St. Petersburg. The vessels serve the Caspian Flotilla of the Southern Military District.
Buyan Class corvettes can conduct maritime patrol missions along the 200-mile maritime economic zone of Russia. The ship can perform missions in shallow waters and river mouths, particularly for delivering troops directly to land.
The keel for the first corvette in class, Astrakhan, was laid down in February 2005 at Almaz Shipyard in St. Petersburg. The ship was commissioned into the Russian Navy in January 2006. Volgodonsk was launched in May 2011. It was demonstrated to the public during the International Maritime Defence Show (IMDS-2011) in St. Petersburg. The ship was delivered in December 2011 and commissioned into the Russian Navy in June 2012.
The third and the last ship in class, Makhachkala, was laid down in March 2006 and launched in April 2012. The delivery of the ship was delayed due to the installation delays of the 100mm gun mount. Makhachkala completed state sea trials in October 2012. The ship was delivered to the Russian Navy in December 2012. It was commissioned into Caspian Flotilla in February 2013.
Buyan-M missile variants and vessel design features
Project 21631 (Buyan-M) corvettes, the missile variants of Project 21630, are being constructed at the Zelenodolsk shipyard. The new vessels are expected to be equipped with missiles, artillery weapons and electronic countermeasure equipment. An export variant known as Project 21632 Tornado is also being proposed.
Buyan Class is a river-sea type corvette designed by Zelenodolsk Design Bureau. The design incorporates stealth features to reduce the radar cross section. The flexible open architecture of the ships allows for modifications according to the future requirements.
The ship has a length of 62m, beam of 9.6m and a draft of two metres. Buyan Class has a displacement of about 500t. Each vessel can accommodate a crew of 29 to 36.
The corvette features better see-keeping capabilities for navigation in stormy conditions. Buyan Class corvettes operate at up to sea state six and can employ weapons at up to sea state four.
Weapons fitted to the Russian naval vessels
The main gun fitted on the bow deck is a single A-190 100mm cannon. Close-point defence is provided by two AK-306 30mm close-in weapon systems. The ship is also armed with A-215 Grad-M naval multiple launch rocket system. The system can fire up to 40 122mm rockets against onshore targets.
The air defence capabilities are complemented by a four-tube 3M47 Gibka naval missile launcher firing Igla or Igla-S anti-aircraft missiles. The ship also houses gun mounts for 14.5mm and 7.62mm machine guns.
Radars / countermeasures of Buyan Class ships
Buyan Class integrates Pozitiv-M air / surface search radar, MR-231 navigation radar and 5P-10 Laska shipborne radar gunfire control system.
The electronic warfare aboard the Buyan Class includes two PK-10 shipborne decoy launching systems mounted on either side of the stern behind the superstructure. The PK-10 is a close-range decoy dispensing system designed to enhance the self-defence capability of the vessels. The system can launch up to ten electronic and optronic decoys to deceive the incoming anti-ship missiles.
Propulsion of the Russian Navy's Buyan Class
Buyan Class is powered by a twin screw combined diesel and diesel (CODAD) propulsion system. The propulsion system consists of two Zvezda M520 radial 56-cylinder diesel engines driving two pump-jet propulsors.
The propulsors, with reduced noise and running vibration, provide high manoeuvrability. Each engine delivers a maximum power output of 3,970kW at 2,000rpm.
The engine is comprised of seven banks of eight cylinders. The usage of aluminium castings reduces the weight of the engine. A crankshaft driven supercharger provides boost pressure to the engine. The supercharger is equipped with water chilled inter-cooler.
The propulsion system provides a maximum speed of 28kt and range of 1,500nmi. The Buyan Class corvettes have a mission endurance of ten days.
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