NAVYPEDIA

Photo

Komsomolets Estonii 1984

Ships

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

Technical data

Displacement standard, t	386
Displacement full, t	473
Length, m	47.9
Breadth, m	8.70
Draught, m	2.36 hull 4.20 max
No of shafts	3
Machinery	2 M504A-3 diesels + 1 M-8NL gas turbine
Power, h. p.	9500 + 20000 = 29500
Max speed, kts	38
Fuel, t	diesel oil
Endurance, nm(kts)	500(15)
Armament	1 x 6 - 30/54 AK-306, 4 - 8 mines
Electronic equipment	Rym, Don-D radars, RTU-2V remote control equipment
Complement	20

Standard scale images

Graphics

Project history

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.

Modernizations

1985, BT-177: diesels were replaced by 2 M504A-4 (9900hp)

Naval service

No significant events.