Buyan Class Corvettes (Project 21630/21631)

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.

Project 21630 Buyan Class corvette / Astrakhan / photo

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) corvette / Vyshny Volochyok / photo

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

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.

Project 21631 (Buyan-M) corvette /

Project 21631 (Buyan-M) corvette /

Ships – Project 21631 (Buyan-M) corvette

Yard №
Laid Down
Almaz Shipyard, St. Petersburg – 0+1 unit
not completed
Shipyard named after A.M.Gorky, Zelenodolsk – 9+3 units
Grad Sviyazhsk
Velikiy Ustyug
Zeleny Dol
Vyshny Volochyok
plan 2021
under construction
plan 2022
under construction
plan 2023
under construction

General characteristics – Project 21631

Displacement (tons):
Full load: 949
Dimensions (m):
Length: 74,1
Beam: 11
Draft: 2,6
Speed (knots): 25
Range: 2500 nmi (12 knots)
Autonomy (days): 10
Propulsion: 4×3700 hp MTU 16V4000M90 diesels (from №636 – 4×3944 hp CHD622V20 diesels), 2 pump-jets
Armament: 1×8 3S14-21631 UKSK 3K14 launchers (Kalibr guided missile complex (8 3M14T missiles)) – 3R14N fire control system
2×6 3M-47 Gibka Igla-1M SAM system launchers
1×1 100 mm A-190-01 (600 rounds) – 5P-10-03 Laska fire control system
1×12 30 mm AK-630M-2 Duet (Stavropol – 1 Pantsir-M 1x(8 launchers 57E6 missiles, 2×6 30 mm)
2×1 14,5 mm MTPU-1 Zhalo
Electronics: 5P-26 Pozitiv air/surface search radar, MR-231 navigation radar, MG-757 Anapa-M anti-saboteur sonar
PK-10 Smely RL decoy (2? KT-216 launchers) – AZ-SO-50, AZ-SR-50, AZ-SOM-50, AZ-SK-50, AZ-SMZ-50 rounds
Complement: 52


Buyan Class corvettes

Project 21630 Buyan Class corvette / warship porn @reddit

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.

Project 21630 Buyan Class corvette /

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.

Project 21630 Buyan Class corvette /

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.

Ships – Project 21630 Buyan Class corvette

Almaz Shipyard, St. Petersburg

Yard №
Laid Down
from 01.2007 – Volgodonsk

General characteristics – Project 21630

Displacement (tons):
Full load: 520
Dimensions (m):
Length: 61,8
Beam: 10,3
Draft: 3
Speed (knots): 26
Range: 1500 nm
Autonomy (days): 10
Propulsion: 2×10000 hp M507D diesels, 2 pump-jet
Armament: 1×6 3M-47 Gibka Igla-1M SAM system launcher
1×40 122 mm MS-73M Grad-M launcher
1×1 100 mm A-190-01 – 5P-10-03 Laska fire control system
2×6 30 mm AK-306
2×1 14,5 mm MTPU-1 Zhalo
Electronics: 5P-26M Pozitiv-M air/surface search radar, MR-231 navigation radar
PK-10 Smely decoy RL (4 KL-121 launchers)
Complement: 48 (6 officers)


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.

A-190 100mm cannon

Project 21631 (Buyan-M) corvette / T24 screenshot

Burevestnik manufactures two variants of 100-mm А190 Lightweight Multipurpose Naval gun: А190E and А190-01.

100-mm А190 Lightweight Multipurpose Naval Gun is a single-barrel turreted automatic gun that may be installed on ships with the displacement of 500 t and more. Upon the operator’s command the fire control module automatically turns the artillery system to standby or combat-ready position, ensures ammunition selection and feeding, gun laying and firing. As a result, the artillery system has minimum response time and high rate of fire.

Main technical data

Rate of fire, rpm up to 80
Maximum firing range, km over 20
Elevation, degree -15 to +85
Training, degree ±170
Projectile weight, kg 15,6
Number of ready-to-fire rounds 80
Weight, t 15

А190 Naval Gun can fire HE (impact fuze) and AA (time fuze) case ammunitions.
The main advantages of А190 system:
– automatic firing mode with main and back-up control means and the capability to operate in EW battlefield environment;
– minimal dead zones when engaging various target types;
– fast reaction (2…5 sec) to counter air threats. Quick shift of fire when engaging multiple targets.

The upgraded version designated as А190-01 provides significant increase in combat effectiveness. High survivability, reliability and combat effectiveness make it possible to operate the gun in various environments day and night all year around. Source

2 x AK-306 30mm close-in weapon systems

Project 21630 Buyan Class corvette /

Design of the AK-630 (A-213) gun system started in 1963. The first prototype was made in 1964 and trials were conducted until 1966. The trials of the complete system with radar and controls went on until 1976 when the system was accepted for service. Production started in 1969 in Tula, with a modified AK-630M (A-213M) system accepted into service in 1979. These systems are the main close-in defense systems on modern Russian ships.

The gun itself is a 6 barrel Gatling gun designated as AO-18. The barrels are in a single block, having exhaust-driven joint automatics. They are belt fed with a flat magazine in the AK-630 and a drum magazine in the AK-630M. These weapons form a part of a complete self-defense system called A-213-Vympel-A, which includes gun, radar, optical and TV control systems. A single MP-123 Vympel system can control two 30 mm guns or one 30 mm and one 57 mm gun. This system can engage air targets at ranges up to 4,000 m (4,400 yards) and surface targets at ranges up to 5,000 m (5,500 yards). The TV control system can detect MTB sized ships at the distance of 75 km (40 nm) and the fighter-size air targets at 7,000 m (7,600 yards). This system is completely automatic and does not require human supervision although it can be directed from optical control posts in case of damage or for firing on shore targets. Source

A-215 Grad-M naval multiple launch rocket system

Project 21630 Buyan Class corvette /

122 mm A-215 “Grad-M” multiple rocket launcher system is designed to destroy manpower and equipment on the shore during the landing of the sea, to support its actions, as well as to protect landing ships from attacks by enemy ships at the crossing of the sea. High speed and range of fire provide effective fire support for the sea landing party.

The upgraded A-215 “Grad-M” RSF is a part of the weaponry of small artillery ships of the 21630 “Buyan” series. The head ship of the 21630 project was laid down on January 30, 2004 in St. Petersburg at the shipyard of OAO “Almaz” and was named “Astrakhan” (h/n 701). On October 7, 2005 the ship was launched and in 2006 it went into service. By 2010 it is planned to build 7 ships of this series at “Almaz” shipyard (according to other data – 10 ships by 2015).

Caliber, mm 122
Shaft number 40
The range of fire is maximum, m 20700
Range of fire minimum tabular, m around 2,000
Angle of vertical guidance, hail between -6 and +93
Angle of horizontal guidance, hail ±164
Vertical Guidance Speed, deg/s 26,4
Horizontal pointing speed, deg/s 29
Weight of unit with storage and feeding devices, kg 16500
Weight of the complex without shells and ZIP, kg 20727
Weight of the complex with shells and ZIP, kg some 31,000
The size of the cellar, m:
– length
– width
– altitude
Dimensions of PU in camping position without bags, mm:
– width
– altitude
Swimming radius, mm 1500
Calculation, man. 2
The interval between the launches of shells in the salvo, s 0,5
Charging time from the first shot, s 46
Recharging time, s 120
Time of firing of all ammunition, mines. 7,3


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.

3M47 Gibka naval missile launcher

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva


Intended to destroy air low-level targets flying at up to 400 km/h in the day- and night-time, small surface ships, moving and stationary current and future main battle tanks, other armoured vehicles (IFCs, APCs),  point targets (like pillboxes and bunkers), fortified assets, manpower under cover and in the open.

The GWS is intended for installation as part of a 3M-47 Gibka turret mount (coded as Gibka-M5 when armed with 9M120-1 and Igla-S missiles or as Gibka-M6 when equipped with 9M120-1 missiles) on surface ships, turrets and fighting compartments of various combat vehicles, tractors, and other military trucks including those of foreign origin.

Specifications of 3M-47 Gibka turreted guided weapon system



Missile guidance Semiautomatic laser beam riding
Laying angles for 9M120-1 missile:

– in azimuth, deg.

– in elevation, deg.


From minus 160 to plus 160

From minus 10 to plus 25

Firing range of 9M120-1 missile, km From 1.0 to 6.0
Target altitude with reference to carrier datum
(for 9M120-1 missile), km
From 0.0 to 2.0

(maximum target altitude is ensured over range of 3.3±0.5 km)

Number of targets engaged simultaneously


Missile launch mode


Rate of fire, rounds./min.


Selection of missiles by warhead type


Armour penetration behind ERA
(for 9M120-1 missile), mm

800, minimum

Time of flight to 5 km, s

14.5, max.

Average flight speed


Reaction time (minimum time for GWS to launch missile after achieving fully operational state), s

Less than 1.2

Number of missiles loaded on launcher, pcs.

Up to 4

Time for manual loading/unloading of one launcher guide, s

30, max.


AK-630M-2 DUET30-mm shipborne automatic double-gun mount (Project 21631 (Buyan-M) corvette)

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

The AK-630M-2 Duet is a radical upgrade of the AK-630 close-in weapon system (CIWS) introduced by the Soviet Union in the 1970s. The new weapon system uses a more conventional unmanned turret with double 6-barrel 30mm guns to achieve combined rate of fire of 10,000 rounds per minute. A new sophisticated fire control system allows fully automatic tracking and targeting against supersonic aircraft, rotary-wing aircraft, cruise missiles and a wide variety of Unmanned Aerial Vehicles (UAVs). Besides, the AK-630M-2 gun system is able to destroy small ships such as fast attack crafts at short ranges. The new turret has a magazine capacity for 4,000 rounds. The Duet gun system can engage targets at distances of 5,000 meters or flying at altitudes of up to 5,000 meters. The Russian Navy has provided the new gun system to the Buyan-M class gunboats and Ivan Gren landing ships.

AK-630 AK-630M-2
Azimuth Coverage (°) 360
Caliber Multiple 165
Combat Weight (kilogram) 1,918
Coverage in Elevation (°)  115
Empty Weight (kilogram)  1,000 3,000
Magazine Capacity 2,000 4,000
Main Gun Caliber (millimeter) 30 30
Main Gun Max Range (meter) 5,000 5,000
Max Rate of Fire (roundperminute) 5,000 10,000
Muzzle Velocity (mps) 890
Number of Barrels 6 12
Target’s Max Altitude (meter) 5,000
Weight (kilogram) 3,836


Buyan-M project 21631 Corvettes to get Pantsir-M CIWS

2 × 1 14,5 mm MTPU-1 Zhalo

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

14.5-mm sea pedestal machine gun mount (MTPU) with 14.5-mm machine gun (KPVT) is intended for armament of the fighting boats and other sea and river vessels to combat the waterborne, shore-based and air lightly armored targets. Item

14.5-mm MTPU serves:
– to aim and conduct machine gun (KPVT) fire by one gunner;
– to provide fire in short (10-15 rd) and long (up to 50 rd) bursts^
– to defeat the waterborne and shore-based targets at a range of up to 2,000 m as well as air targets at a height of up to 1,500 m and at a range of up to 2,000 m (using the cartridges with armour-piercing incendiary bullets Б-32, armour-piercing incendiary tracer bullets БЗТ and incendiary instantaneous bullets МДЗ).
– to perform practice with blank cartridges.

Project 21631 (Buyan-M) corvette / Vyshny Volochyok / photo

Armament machine gun KPVT
Calibre, mm 14.5
Cyclic rate of fire, rds/min, no less than 450
Accuracy range, m:
– ground target 2000
– air target 1500
Mass of mount with machine gun
(without ammunition load and SPT&A), kg, max 350
Overall dimensions of mount
(including base height from deck – 100 mm), mm:
– length 2800
– width 865
– height at elevation angle of 0°, mm 1500-1800
– height at elevation angle of 60°, mm 2590-2890
Maximum turning radius, mm 1,704
Elevation, grad -15 to +60
Traversing angle, grad ±180
Height of sight radius (including base height frodeck -100 mm), mm 1,450.
Fire line height (including base height from deck – 100 mm), mm 1,100.
Mass of machine gun, kg, max:
– without electric trigger 49.5
-with electric trigger 52
Feed RH
Barrel cooling air
Aiming principle manual
Method for applying fire manual or with electric trigger
Crew, pers. 1


UKSK 3K14 launchers (Buyan-M)

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

3M14T land attack variant

High-precision cruise missile 3M-14E is designed to engage in simple and complex meteorological conditions day and night stationary (sedentary) land and sea targets. Typical targets for the missile 3M-14E are ground control points, weapons and fuel depots, airfield and port facilities.

3M14E rockets in various configurations are included in the composition:

  • Kalibr-PLE missile system for arming submarines (export designation “Club-S”),
  • Kalibr-NKE rocket system for arming surface ships (export designation “Club-N”).
  • The Kalibr-M mobile missile system (export designation “Club-M”);
  • Aircraft-based missile weapon system “Calibre-A” (“Club-A”).

Integrated missile systems “Caliber” are designed to engage a wide range of land, sea surface and underwater targets in conditions of intensive fire and electronic counteraction of the enemy. All the complexes have a single combat vehicle:

  • anti-ship missiles 3M-54E, 3M-54E1,
  • high-precision cruise missiles to engage ground targets 3M-14E,
  • Anti-submarine missiles 91RET2 (“Calibre NCE”) and 91RET1 (“Calibre-PLE”)

Availability of missiles for various purposes as part of Calibre systems, as well as a single universal control system (SU) of the missile system allows you to vary the set of missiles on carriers depending on the task in hand and the specific combat situation.

Cruise missile 3M-14E (see photo) complexes “Caliber-PLE”, “Caliber-NKE”, “Caliber-M” is equipped with a solid propellant launch engine in the tail part of which are located grating stabilizers. The TRDD-50B turbofan engine (“Product 37”, 37-01E) is a small-size two-circuit turbojet of disposable application, unified for all Kalibr missiles, developed by the Omsk Engine Building Design Bureau (see photo). It is produced by NPO Saturn.

The 3M-14E rocket is equipped with a combined guidance system. Control of the rocket in flight is fully autonomous. The onboard control system is based on the autonomous inertial navigation system AB-40E (developed by the State Research Institute of Instrument Engineering). The missile control system includes a radio altimeter of the RVE-B type (developed by UPKB Detail) and a receiver of satellite navigation system signals (GLONASS or GPS). The radio altimeter provides flight in the mode of terrain rounding due to precise keeping the flight altitude: over the sea – no more than 20 m, over land – from 50 to 150 m (when approaching the target – a decrease to 20 m).


Rocket 3M-14E / 3M-14AE
Length, m: 6,20
Hull diameter, m: 0.533
Wingspan, m: 3.080
Starter weight, kg 1770 / 1400
Weight BC, kg 450
Launch range, km: 2600 (300)
Flight altitude, m
– over the sea
– above ground
50 – 150
Speed, m/s: 180 – 240
Launch height, m 500 – 11000 (for 3M-14AE)
Angles of approach to the target, hail. +/- 180
Marshal engine 37-01E
Maximum traction, kgf 450
Specific fuel consumption at maximum mode, kg/kgf*h 0,71
Diameter, mm 330
Length,mm 850
Dry weight, kg 82
Used fuel T-1 (aviation kerosene), T-6, T-10 (decylin), TS-1, RT


Project 21631 (Buyan-M) corvette / Grad Sviyazhsk

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.

Pozitiv-M air / surface search radar

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

Modern system designed to search, detect and track air and surface targets

– small-size system;
– short time of response;
– reliable monitoring algorithms;
– full automation of combat activities and substantial jamming immunity.

3D radar Pozitiv-ME1.2 is designed to search, detect, identify and track air and surface targets. The system can be installed on ships with low or medium displacement and be a part of a multifunctional radar system.

High antenna rotation speed, electronic elevation scanning and special monitoring, lock on and tracking modes and algorithms ensure short time of response, high capacity of the system and accurate designation data output. Source

Type: Radar Altitude Max: 30480 m
Range Max: 129.6 km Altitude Min: 0 m
Range Min: 0.4 km Generation: Late 1990s
Properties: Identification Friend or Foe (IFF) [Side Info], Track While Scan (TWS), Pulse-only Radar
Cross Round [MR-352 Positiv ME-1.2] – (CADS-N-1 Target Designator) Radar
Role: Radar, Target Indicator, 3D Surface-to-Air & Surface-to-Surface
Max Range: 129.6 km


MR-231 navigation radar

Navigation radar MP-231 with a wavelength of 3 meters provides automatic support of at least 50 goals and tracks relative and true motion purposes with the change of time of their duration. MP-231 may interact with many different devices connected, including hardware and state identification purposes. Navigation radar MP-231 automatically detects the target in the buffer zone and indicates them.

Radar MP-231 can apply the electronic card on the radar screen, and adjust the view of the image and graphic information regarding water and soil. The secondary field of MP-231 screen can zoom in on the selected image area from the individual displaying it. On the radar screen reproduces such information about a ship, such as: course, speed, current time, the geographical coordinates and the depth under the keel. MP-231 mounted in the vessel a bridging system.

Navigation radar MP-231 meets the requirements of the Russian Maritime Register of Shipping and IMO.

– The wavelength of 3 cm
– Obmetaniya antenna diameter of 3 m; 2.5 m; 1.6. m
– The size of the LCD monitor 19 ‘
– Transmission Power 10 kW
– Scale range up to 96 miles
– The average sea buoy (without corner reflector) – ESR = 10 m, h = 2,5 m – 4,0 nm
– The minimum detection range with a probability of 0.8 at height of installation 7 m – maximum 20 m
– Stability detection of objects at motion provided beamwidth vertical 25 °
– Resolution station capacity in the direction with a probability 0,8 °; 1,2 °; 2 °
– Range resolution with a probability of 0.8 of not more than 25 m
– Maximum permissible error of measurement of electronic directions -0.3 °
– Maximum permissible error of electronic media ranging – 10m / 0.5% of span


5P-10 Laska shipborne radar gunfire control system

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

– Radio-electronic coordinator in RCS 5П-10-03Э is united with control module for artillery system firing of 30-100 mm caliber.
– Lightweight antenna system.
– Full configured RCS includes additional equipment providing simultaneous firing control of several shipboard gun mounts in automatic mode firing to a single or double air, surface and shore targets.
– RCS software obtains intuitive interface which provides solutions to artillery system automatic control in all operation modes.
– Multi-purpose small-scale radar system for control of shipboard artillery firing 5П-10-03Э is installed in surface ships of medium and light (not below 150 t) tonnage.

СУ 5П-10-03Э architecture includes fire control subsystem united with radio-electronic coordinator and power supply subsystem.

Fire control subsystem provides automatic fire control based on target present data, coming from radio-electronic coordinator or from other target acquisition shipborne systems, as well as interface with shipborne systems and the work results recording.

Power supply subsystem provides devices with necessary identification scheme of double current supply voltage and includes primary and secondary power supply hardware.

Data channels: radar;
Radar channel wavelength 3 sm
Arm time:
from “Full off” position not more than 3 min;
in burst mode 60 sec;
from “High voltage off” mode 2 sec.
Working range:
depending on the selected range scale. 14; 21; 30 km
System response time:
Under operation by TA in monopulse tracking mode no more than 3 sec.;
Under autonomous detection in sector scanning mode for a single target no more than 6 sec.;
Under autonomous target detection and tracking in sector scanning mode with continuous scanning and tracking of up to 4 targets оit may be 10-45 sec.
System total weight with no SPTA, mounting kit and power supply equipment 1400 kg, including the antenna station weight up to 700 kg
Power supply from shipborne power system no more than 16 kVA
Combat crew 1 person
Under operation in autonomous mode by targets with RCS = 0,1 m and velocity up to 700 m/s the gunnery fire control is provided in the effective fire range of air defense artillery of 30-100 mm calibers.


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-defenses capability of the vessels. The system can launch up to ten electronic and optronic decoys to deceive the incoming anti-ship missiles.

2 x PK-10 shipborne decoy launching systems

Project 21631 (Buyan-M) corvette / Uglich / photo Marina Lystseva

MG-757 Anapa-M anti-saboteur sonar (Buyan-M)


The Anapa-ME underwater anti-saboteur detection sonar system is designed for surveillance underwater situation to provides anti-sabotage actions protection of ships stopped in the open roadsteads or basing points, and to safeguard important military and industrial installations, hydrotechnical facilities in ports, open sea and other water areas.


The Anapa-ME sonar main missions are as follows:

– search and detection of underwater saboteur with flippers or underwater delivery scooters;
– identification and tracking underwater targets;
– automatic measurement of target coordinates and their feeding into anti-saboteur weapons launchers.


Propulsion of the Russian Navy’s Buyan Class

Project 21631 (Buyan-M) corvette / Zelenyy Dol / Russian MoD picture

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 propulsions.

“The keel for the first corvette in class, Astrakhan, was laid down in February 2005 at Almaz Shipyard in St. Petersburg.”

The propulsions, with reduced noise and running vibration, provide high maneuverability. 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 aluminum 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.

2 x Zvezda M520 radial 56-cylinder diesel engines

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.

Main material source

Images are from public domain unless otherwise stated

Main image by Project 21631 (Buyan-M) corvette / Vyshny Volochyok / A.Brichevsky

Revised Jun 22, 2021

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