Buyan-class corvette (pr 21630) Buyan-M-class corvette (pr 21631) Class overview Name: Buyan class or Project 21630 Builders: Almaz Shipbuilding Company Zelenodolsk Plant Gorky Operators: Russian Navy Succeeded by: Karakurt-class corvette Subclasses: Project 21631 "Buyan-M" Project 21632 "Tornado" Building: 4 Planned: 15 Completed: 9 Active: 8 General characteristics Type: Corvette Displacement: 500 tons standard (project 21630)[1] 949 tons full (project 21631)[2] Length: 62 m (203 ft) (21630)[1] 75 m (246 ft) (21631)[2] Beam: 9.6 m (31 ft) (21630)[1] 11 m (36 ft) (21631)[2] Height: 6.57 m (22 ft) Draft: 2 m (7 ft) (21630)[1] 2.5 m (8 ft) (21631)[2] Propulsion: 2 shaft CODAD, 4 x Zvezda M520, 14,584 shp (10,880 kW) and Kolomna Diesel, Pumpjet. Speed: 28 knots (52 km/h; 32 mph) (21630)[1] 26 knots (48 km/h; 30 mph) (21631)[2] Range: 1,500 nmi (2,800 km; 1,700 mi) (21630)[1] 2,300 nmi (4,300 km; 2,600 mi) at 12 knots (21631)[2] Endurance: 10 days[2] Complement: 29-36 (21630)[1] 52 (21631)[2] Sensors and processing systems: Radar: MR-352 Pozitiv-M1.2 phased array radar system (Pozitiv-ME1.2 for export)[3] Fire Control: 5P-10-03 Laska (5P-10-03E for export)[3] Sonar: Anapa-M suite (Anapa-ME for export)[3] Navigational Radar: MR-231 Pal[3] Other: 1 x electro-optical surveillance device Electronic warfare & decoys: 2 × PK-10 decoy launchers[3] Armament: 1 × 100 mm A-190[3] 2 × 30 mm AK-630 (AK-630-M2 in 21631) 1 × 40 retractable A-215 "Grad-M" (only 21630) 2 × 4 UKSK VLS cells with Kalibr-NK system or P-800 Onix (only 21631) 1 × 4 3M47 Gibka (only 21630) 2 × 4 Komar (only 21631)[4] 1 × DP-65 anti-saboteur grenade launcher 2 × 14.5 mm KPV type 3 × 7.62 mm PKM type (only 21631)