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Seagoing Minesweeper Torpedist
Project 266M / Natya Class

The Natya-class were a group of minesweepers built for the Soviet Navy and export customers during the 1970s and 1980s (58 ships were built). The Soviet designation was Project 266M Akvamarin. The ships were used for ocean minesweeping.

The design evolved from the Yurka class minesweeper with new demining equipment including more advanced sonar and closed circuit TV. A stern ramp made recovering sweeps easier. The hull was built of low magnetic steel. To protect against acoustic mines the foundations main engines and diesel generators were padded with rubber, installation of mechanisms for isolating dampers; installation of flexible inserts in pipes; application of low-noise propellers controlled step large-diameter, as well as the installation of low-noise machinery and equipment. An electrical field compensator was also installed.

Seagoing Minesweeper Torpedist laid down at the Sredne-Nevsky Shipyard, Pontonny (yard No.909), commissioned in 1972 and assigned to the Black Sea Fleet.

From 1990 - OS-99 trial ship, all armament were removed.

OS-99 was decommissioned and excluded from the lists of the Black Sea Fleet on 01 September 1995 and scrapped.

Displacement (tons):
Full load:800
Dimensions (m):
Speed (knots):17
Range:2700 nmi (12 knots)
Autonomy (days):10
Propulsion:2x2500 hp M-503B-3 diesels, 2 fixed pitch propellers in nozzles2x200 kW DGRA-200/1500 diesel generators, 1x100 kW DGRA-100/1500 diesel generator

2x2 30 mm AK-230M - 2000 rounds - MR-104 Rys fire control system
2x2 25 mm 2M-3M - 2000 rounds
2x5 RBU-1200M Uragan (68 RGB-12)
32 BB-1 or 7 KMD-1000 mines
KIU-1 sweep, BKT contact sweep, TEM-4 magnetic sweep, AT-3 acoustic swwp, ShZ-1 or ShZ-2 detonating cord


MR-302 Rubka air/surface search radar, 2 Don-D navigation radars, Nikhrom-R IFF, MG-69 Lan mine search sonar, MG-79 Mezen mine search sonar, MG-26 Khosta underwater communication system

Complement:68 (6 officers)


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