|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|БТ-177 [BT-177], 3.1975- Алтайский комсомолец [Altayskiy Komsomolets], 2.1992- БТ-177 [BT-177]||516||Sredne-Nevskiy SYd, Pontonnyy||1.12.1974||stricken 6.1993|
|БТ-137 [BT-137], 6.1975- Комсомолец Эстонии [Komsomolets Estonii], 2.1992- БТ-137 [BT-137]||517||Sredne-Nevskiy SYd, Pontonnyy||1.12.1974||stricken 6.1993|
|Displacement standard, t||
|Displacement full, t||
2.36 hull 4.20 max
|No of shafts||
2 M504A-3 diesels + 1 M-8NL gas turbine
|Power, h. p.||
9500 + 20000 = 29500
|Max speed, kts||
1 x 6 - 30/54 AK-306, 4 - 8 mines
|Electronic equipment||Rym, Don-D radars, RTU-2V remote control equipment|
These ships were conceived to escort larger ships through mined waters, dealing with mines with combination (pressure, acoustic, magnetic) fuzes. The unusually high power was intended to allow them to move at high speed to create a turbulent wake which would trigger pressure mines. In theory, the sweeper would first sweep for magnetic and acoustic mines, then escort ships in the hydrodynamic field of its own wake, manoeuvering to distort the pressure fields of the ships so as not to trigger the mines. Alternatively, the sweeper could create very strong fields of its own, to trigger mines beyond ranges at which they would be lethal. Hence the solenoid coils which were partly visible on the ship's side. Machinery noise could be amplified to trigger acoustic mines. Because there was always a change that a triggered mine would destroy the sweeper, remote-control gear was installed.
They had plastic hulls, and large cable ducts running down both sides A prominent stack served a gas turbine generator, the propulsion diesels exhausting through the hull sides.
1985, BT-177: diesels were replaced by 2 M504A-4 (9900hp)
No significant events.