266* Akvamarine/Natya I/II class

Statistics: total active:12 Competitors: Not available [crossreferences:] State of the Russian Navy

BAL  1 BLS  6 NOR  3 PAC  2 * where available

Full displacement 804 t
Standard displacement 750 t
Length overall 61 m
Beam overall 10.2 m
Mean draught at full displacement 3.0 m
Maximum speed 16 +/- 0.5 kn
Cruising speed 12 kn
Design range at cruising speed 3000 nm
Endurance 15 days
Hull material low magnetic steel
Bollard pull at 10-14 kn. speed 20-10 t
Sea keeping unlimited


PROPULSION
Main engines - 2xM503B-37 with maximum
output 2x2250 at tropical conditions
2xVR226 AE-TM Controllable Pitch propellers


ELECTRIC SYSTEM
4X200 kW 7D12 diesels with MSK-103-4 generators
Voltage AC 400/3/50.


ARMAMENT
2xRBU-1200 Multiple Rocket-propelled Bomb
system - ASW
UDME Mines - 8 pieces
Artillery - 2xAK-306 30 mm Gun mounts with

Igla-1 Portable AA missiles


NAVIGATION
Navigation Radar
Gyro course indicator
Radio direction finder
GPS Indicator-receiver
Log
Echosounder


COMMUNICATIONS
HF Transceivers
MF/UHF Transceivers
UHF Transceivers
All band Receivers


SPECIAL EQUIPMENT
Radar, magnetic and acoustic signatures do not exceed those of world’s best designs







MCM EQUIPMENT
Var.1 (Russia) Var.2 (France)
MCM system comprising Thomson Marconi Sonar
Hull mounted sonar MG-89M TSM2022.MK.3
Propelled Variable depth sonar Mayovka-E PVDS on Double Eagle
Mine disposal vehicle Mayovka-E Double Eagle
Tactical system MCM automatic control TSM 2061
Contact sweep GKT-2 GKT-2
Influence acoustic sweeps AT type AT type

This MSM vessel capable to destroy mines in remote waterways by mean mechanical, acoustic sweepes and in front of itself at safety distance by MDV.

DESIGNATION
Offshore MCM operations in remote waterways, oil rigs and fishing areas.
The ship could also be used for training, patrol, landing and mine laying purposes.


Standard general-purpose oceangoing minesweeper; also intended as a coastal ASW escort in wartime. Production resumed in the 1990's, apparently mainly for export, but several of the new units were acquired by the Russian navy. Later units vary in weapons and electronics.

Natya II: Variant of the standard 'Natya-I' class outfitted as a trials ship for a new minehunting sonar. Probably capable of serving as an operational minehunter. Most armament and sweep gear omitted from this unit.

Classification: Morskoy Tral'shchick (MT); seagoing minesweeper.

Builders: Sudostroil'noye Obyedieneniye (Almaz), Sredniy Neva, Kolpino; Khabarovsk SY; built 1979-1980, 1991-present.

Disposals/Reserve: Several sisters stricken, sold, or converted.


Designed to hunt, sweep and destroy mines.
The degaussing gear comprises common and local shipboard coils used to compensate the fields induced by large items of machinery. It is controlled via an automatic system providing for the compensation of eddy currents occurring in the hull during oscillatory motions.

All parts contacting the sea water are coated with dielectric material. All sound-producing mechanisms are mounted on sound-absorbing cushions with rubber coating material cemented to their bases; all pipelines are fitted with flexible inserts. The ship’s hull is made from low-magnetic steel and light alloys. The ship is fitted with large-diameter low-noise propellers.

Main diesels are mounted on longitudinal vibrationdamping beams. Propellers are protected with noisereducing shrouds. Cavitation and noise monitoring equipment is installed. To compensate the electric field, use is made of adjustable protectors.
The minesweeping gear includes a deep sweep featuring new control devices, mobile mine demolition
sweep, three-channel wide-band towed TV-operated mine detector-destructor, versatile mine detectordestructor, and a new bottom mine hunting sonar.
The stern slip makes it possible to mechanize the sweep setting and lifting operations. Special-purpose optronic equipment is installed to detect floating mines 24 hours a day. Operation of major systems and various facilities is automated. Light high-speed diesels are remote-controlled via a self-adjustable pneumatic control system. All deck mechanisms are hydraulically driven. The minesweeper is equipped with CBR defense system. All living spaces are airconditioned.
While the ship can be operated at any sea state, its armament can be employed at sea state up to 4.