Project 659

NATO: Echo I

Project 659T

Type	SSN
Soviet designation	PLARK
NATO reporting name	Echo I (mod)
Country	USSR
Displacement (t)	5,500
Length (m)	111.2
Beam (m)	9.2
Draft (m)	7.1
Height (m)	9.2
Max speed submerged (kn)	25.0
Max speed surfaced (kn)	20.0
Max safe depth (m)	241
Endurance (days)	50
Nuclear reactors	2
Titanium hull	No
Class year	1969

Sensors

Sonar (6)

Name	Type	Platform	Passive range (km)	Active range (km)
MG-10 Kola	Cylindrical	sub	0.9	—
MG-13	Active Intercept		—	—
MG-200 Arktika	Hull	sub	—	1.3
MG-23 Beresta-M	ssp		—	—
NEL-6	Echo sounder	sub	—	—
Plutoniy	Mine hunting	sub	—	0.9

Launchers (4)

Name	Tubes	Fire control	Max launch depth (m)
400mm Torpedo Tube (forward) 2 Leningrad-659 250 1962 - 1967: 4 x SET-40 1968 - present: 4 x SET-40U
400mm Torpedo Tube (aft) 2 Leningrad-659 250 1962 - 1967: 2 x SET-40 1968 - present: 2 x SET-40U
533mm Torpedo Tube (forward) 4 Leningrad-659 100 1958 - 1960: 5 x 53-56 , 5 x SAET-50M , 10 x SET-53 1961 - 1963: 5 x 53-61 , 5 x SAET-60 , 10 x SET-53 1964 - 1964: 5 x 53-61 , 5 x SAET-60 , 10 x SET-53M 1965 - 1968: 5 x 53-65 , 5 x SAET-60 , 10 x SET-65 1969 - present: 5 x 53-65K , 5 x SAET-60M , 10 x SET-65M
Signal Ejector	2	—	200