NAVYPEDIA

Photo

Launching of R12, 1919

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
SS78	R1	282	Fore River, Quincy	10/1917	24.8.1918	12.1918	stricken 11.1945
SS79	R2	283	Fore River, Quincy	10/1917	23.9.1918	1.1919	stricken 11.1945
SS80	R3	284	Fore River, Quincy	12/1917	18.1.1919	4.1919	to United Kingdom 1.1941 (P511)
SS81	R4	285	Fore River, Quincy	10/1917	26.10.1918	3.1919	stricken 7.1945
SS82	R5	286	Fore River, Quincy	10/1917	24.11.1918	4.1919	stricken 10.1945
SS83	R6	287	Fore River, Quincy	12/1917	1.3.1919	5.1919	stricken 10.1945
SS84	R7	288	Fore River, Quincy	12/1917	5.4.1919	6.1919	stricken 10.1945
SS85	R8	289	Fore River, Quincy	3.1918	17.4.1919	7.1919	stricken 5.1936
SS86	R9	290	Fore River, Quincy	3/1918	24.5.1919	7.1919	stricken 10.1945
SS87	R10	291	Fore River, Quincy	3/1918	28.6.1919	8.1919	stricken 7.1945
SS88	R11	292	Fore River, Quincy	3/1918	12.7.1919	9.1919	stricken 10.1945
SS89	R12	293	Fore River, Quincy	3/1918	15.8.1919	9.1919	foundered 12.6.1943
SS90	R13	294	Fore River, Quincy	3/1918	27.8.1919	10.1919	stricken 10.1945
SS91	R14	295	Fore River, Quincy	11/1918	10.10.1919	12.1919	stricken 5.1945
SS92	R15	173	Union Iron Wks, San Francisco	4/1917	10.12.1917	7.1918	stricken 10.1945
SS93	R16	174	Union Iron Wks, San Francisco	4/1917	15.12.1917	8.1918	stricken 7.1945
SS94	R17	175	Union Iron Wks, San Francisco	5/1917	24.12.1917	8.1918	to United Kingdom 3.1942-9/1944 (P512), stricken 6.1945
SS95	R18	176	Union Iron Wks, San Francisco	6/1917	8.1.1918	9.1918	stricken 11.1945
SS96	R19	177	Union Iron Wks, San Francisco	6/1917	28.1.1918	10.1918	to United Kingdom 3.1942 (P514)
SS97	R20	178	Union Iron Wks, San Francisco	6/1917	21.8.1918	10.1918	stricken 10.1945
SS98	R21		Lake, Bridgeport	4.1917	10.7.1918	6.1919	stricken 5.1930
SS99	R22		Lake, Bridgeport	4.1917	23.9.1918	8.1919	stricken 5.1930
SS100	R23		Lake, Bridgeport	4.1917	5.11.1918	10.1919	stricken 5.1930
SS101	R24		Lake, Bridgeport	5.1917	21.8.1918	6.1919	stricken 5.1930
SS102	R25		Lake, Bridgeport	4.1917	15.5.1919	10.1919	stricken 5.1930
SS103	R26		Lake, Bridgeport	4.1917	18.6.1919	10.1919	stricken 5.1930
SS104	R27		Lake, Bridgeport	5.1917	23.9.1918	9.1919	stricken 5.1930

Technical data

Displacement standard, t
Displacement normal, t	SS78 - 97: 569 / 680 SS98 - 104: 510 / 583
Length, m	SS78 - 97: 56.8 SS98 - 104: 53.3
Breadth, m	SS78 - 97: 5.50 SS98 - 104: 5.10
Draught, m	4.40
No of shafts	2
Machinery	SS78 - 97: 2 NLSE diesels / 2 electric motors SS98 - 104: 2 Busch-Sulzer diesels / 2 electric motors
Power, h. p.	SS78 - 97: 1200 / 940 SS98 - 104: 1000 / 800
Max speed, kts	SS78 - 97: 13.5 / 11 SS98 - 104: 14 / 11
Fuel, t	diesel oil 75
Endurance, nm(kts)	4700 (6) /
Armament	SS78 - 97: 1 x 1 - 76/50 Mk VI, 4 - 533 TT (bow, 8) SS98 - 104: 1 x 1 - 76/50 Mk VI, 4 - 450 TT (bow, 8)
Electronic equipment	SC sonar
Complement	29
Diving depth operational, m	60

Standard scale images

Graphics

Project history

Quite successful boats, development of previous 'O' class, but faster and having stronger artillery (a long-barrelled gun). 20 submarines entered service the first (R1-20), were built under Holland project, second seven (R21-27) were built under Lake project. The latter were appeared unsuccessful. Saddle-tank hull.

Modernizations

1939-1940, most survived: - 1 x 1 - 76/50; + 1 x 1 - 12.7/90, JK sonar

1940s, most survived: - SC sonar; + SD or SJ radar, QB or QC, JP sonars

Naval service

R12 was lost 12.6.1943 off Key West (Florida) during training diving.

, 1919