NAVYPEDIA

Photo

Project 670 1975  

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
К-43 [K-43], 8.1984- УТС-550 [UTS-550], 3.1991- К-43 [K-43], 4.1992- Б-43 [B-43]		701	Krasnoe Sormovo, Gorkiy	9.5.1964	2.8.1966	6.11.1967	to India 12.1984-3/1991 (चक्र [Chakra]), stricken 7.1992
К-87 [K-87], 1.1978- К-212 [K-212]		702	Krasnoe Sormovo, Gorkiy	6.2.1965	20.3.1966	28.12.1968	stricken 4.1990
К-25 [K-25]		703	Krasnoe Sormovo, Gorkiy	2.12.1965	31.7.1968	30.12.1968	stricken 6.1991
К-143 [K-143], 7.1977- К-121 [K-121], 4.1992- Б-121 [B-121]		704	Krasnoe Sormovo, Gorkiy	25.11.1966	29.4.1969	31.10.1969	stricken 6.1993
К-313 [K-313], 4.1992- Б-313 [B-313]		705	Krasnoe Sormovo, Gorkiy	14.7.1966	16.7.1969	16.12.1969	stricken 7.1992
К-308 [K-308], 4.1992- Б-308 [B-308]		711	Krasnoe Sormovo, Gorkiy	29.12.1967	19.2.1970	20.9.1970	stricken 7.1992
К-320 [K-320], 4.1992- Б-320 [B-320]		712	Krasnoe Sormovo, Gorkiy	30.4.1968	27.3.1971	15.9.1971	stricken 7.1994
К-302 [K-302], 4.1992- Б-302 [B-302]		713	Krasnoe Sormovo, Gorkiy	17.1.1969	11.7.1970	1.12.1970	stricken 6.1993
К-325 [K-325]		714	Krasnoe Sormovo, Gorkiy	6.9.1969	4.6.1971	5.11.1971	stricken 6.1991
К-429 [K-429]		715	Krasnoe Sormovo, Gorkiy	26.1.1971	22.4.1972	15.9.1972	training hulk 3.1987
К-201 [K-201], 4.1992- Б-201 [B-201]		721	Krasnoe Sormovo, Gorkiy	16.11.1971	26.8.1972	26.12.1972	stricken 10.1994

Technical data

Displacement standard, t
Displacement normal, t	3574 / 4430
Length, m	95.6
Breadth, m	9.60
Draught, m	7.81
No of shafts	1
Machinery	OK-350 steam generation unit (1 VM-4-1 nuclear reactor), 1 GTZA-631 geared steam turbines unit
Power, h. p.	18800
Max speed, kts	12 / 26
Fuel, t	nuclear
Endurance, nm(kts)	practically unlimited
Armament	8 x 1 P-40 Ametist SSM (8 4K66), 4 - 533 TT (bow, 14), 2 - 400 TT (bow, 4)
Electronic equipment	RLK-101 Albatros or MRK-50 radar, MGK-100 Kerch'-670, MG-17 sonars, Zaliv-P ECM suite, Brest CCS
Complement	86
Diving depth operational, m	240

Standard scale images

Graphics

Project history

Project 670 was initially conceived as a mass-production nuclear submarine; hence the choice of a single-reactor powerplant at a time when the Soviet naval staff very strongly preferred two reactors and two propellers. The Lazurit KB (TsKB-112, associated with the Gorkiy yard) prepared the design, probably having won the competition. Some time after the design had been begun, the submarine was redesigned to carry the anti-ship missile system which had been conceived for Project 661. Presumably that was because Project 661 was so clearly going to be both late and overexpensive. There wee also problems with the planned P-40 Ametist missile. The boat was designed to accommodate the projected weapon, but for the first series a modified P-15, probably designated P-20L, was substituted. This missile was shorter than P-40, so the tubes are plugged at their lower ends. Missiles were fired submerged on the basis of intermittent radar data: the fire control system was an adapted version of the surface ship system. A nuclear version can be fired (to first convergence zone) on the basis of sonar data.

Modernizations

1980s, K-212, K-302, K-308, K-313, K-320: - MGK-100 Kerch'-670 sonar; + MGK-400 Rubikon sonar

1984, K-43 - under Project 06709: - MGK-100 Kerch'-670 sonar; + MGK-400 Rubikon, MG-519 Arfa sonars

Naval service

 K-429 sank in Sarannaya Bight E of Petropavlovsk 23 June 1983, reportedly because a ventilator out closed before a post-refit dive. Raised and repaired, she sank at dock 13.9.1985 again. She was again raised but then was used only as a training hulk. K-43 was officially reclassified as training hulk 30.8.1984 for training of Indian crew and was stricken from Soviet fleet list 27.12.1984. Four years she was used for training, Indian flag was raised only 5.1.1988. 1.3.1991 she was returned to Soviet Navy and commissioned again.