NAVYPEDIA

Photo

Grayback 1969

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
SSG574, 8.1968- LPSS574, 6.1975- SS574	Grayback		Mare Island N Yd, Vallejo	1.7.1954	2.7.1957	7.3.1958	amphibious transport submarine 8.1968, stricken 1.1984

Technical data

Displacement standard, t	2287
Displacement normal, t	2670 / 3638
Length, m	98.3
Breadth, m	9.10
Draught, m	5.30
No of shafts	2
Machinery	3 Fairbank Morse diesel-generators, 2 Elliott electric motors
Power, h. p.	4500 / 5600
Max speed, kts	15 / 12
Fuel, t	diesel oil
Endurance, nm(kts)
Armament	2 x 1 Regulus I SSM launchers (4 SSM-N-8), 8 - 533 TT (6 Mk 52 bow, 2 Mk 53 stern)
Electronic equipment	BPS-12 radar, BQS-4, BQR-2 sonars, BLR-1 ECM suite
Complement	84
Diving depth operational, m	210

Standard scale images

Graphics

Project history

Grayback and Growler were laid down as sisters to Darter, then cut in two and lengthened by ~15m to accommodate two cylindrical hangars for Regulus missiles.

Modernizations

1964: - 2 x 1 Regulus I SSM launchers (4 SSM-N-8)

(11/1967-5/1969, Mare Island N Yd): length was increased to 101.8m (2670st/3650t); missile hangars were converted to 'lock out' swimmers and swimmer delivery vehicles (SDV), fin was raised; + BQG-4 PUFFS sonar

Naval service

Both were decommissioned in May 1964 when Regulus was retired. However, Grayback was converted to amphibious transport (LPSS). She was reclassified as on attack submarine in 1975, apparently without any further changes. A similar planned conversion of her sister ship was cancelled in view of the high cost of die first conversion.