Project 651

NATO: Juliett

Project 651T

Type	SSG
Soviet designation	PLRK
NATO reporting name	Juliett (mod)
Country	USSR
Displacement (t)	4,240
Length (m)	85.9
Beam (m)	9.7
Draft (m)	6.9
Height (m)	15.0
Max speed submerged (kn)	14.5
Max speed surfaced (kn)	16.0
Max safe depth (m)	236
Endurance (days)	90
Propeller	2 x 6 bladed propellers
Diesel-electric	Yes
Titanium hull	No
Navigation system	Sila-N-651 (Automatic Dead Reckoning)
Class year	1967

Sensors

Sonar (7)

Name	Type	Platform	Passive range (km)	Active range (km)
MG-10M Kola	Hull	sub	0.9	—
MG-13 Svet	Active Intercept		—	—
MG-15	com	sub	—	—
MG-200 Arktika	Hull	sub	—	1.3
MG-23 Beresta-M	ssp		—	—
NEL-5	Echo sounder	sub	—	—
Plutoniy	Hull	sub	—	0.9

Radar (4)

Name	NATO name	Air search	Surface search	Fire control
Argument	Front Door	—	—	Yes
ARP-53		—	—	—
MRP-10 Nakat		—	—	—
RLK-101 Albatros	Snoop Tray 1	—	Yes	—

Launchers (4)

Name	Tubes	Fire control	Max launch depth (m)
400mm Torpedo Tube (aft) 4 Leningrad-651 250 1963 - 1967: 12 x SET-40 1968 - present: 8 x SET-40U
533mm Torpedo Tube (forward) 6 Leningrad-651 100 1963 - 1963: 0 x 53-56 , 1 x 53-56N , 0 x 53-57 , 3 x 53-61 , 2 x SAET-60 , 4 x SET-53 1964 - 1964: 0 x 53-56 , 1 x 53-56N , 0 x 53-57 , 3 x 53-61 , 2 x SAET-60 , 4 x SET-53M 1965 - 1968: 0 x 53-56 , 1 x 53-56N , 0 x 53-57 , 3 x 53-61 , 2 x SAET-60 , 4 x SET-65 1969 - present: 1 x 53-56N , 3 x 53-65K , 2 x SAET-60M , 4 x SET-65M
Missile Launcher 4 P-5D FCS 0 1962 - present: 3 x P-6 , 1 x P-6 (N)
Signal Ejector	2	—	200

Extendable devices (9)

Name	NATO name	Capabilities	Max depth (m)	Max speed (kn)
Argument FC Radar	—	Radio (VHF), Fire control	—	7.5
ARP-53 RDF	—	Direction finder	—	7.5
Iskra-1 Radio antenna	—	Radio (LF, MF, HF), Radio navigation	—	7.5
MRP-10 Nakat ESM	—	ESM	—	7.5
PR-14 Astrocorrector	—	Periscope (astro)	—	7.5
PSNG-8M Attack periscope	—	Periscope (attack)	—	7.5
PZNA-10 Search periscope	—	Periscope (observation)	—	7.5
RDP	—	Snorkel	—	7.5
RLK-101 Albatross Radar	—	Radar	—	7.5

Notes

"Project 651T" is an unofficial name. This variant carries 4 additional 533mm reserve torpedoes in the second ompartment.