R1 1918
R13 1940
| 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 |
|
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 |
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.
Launching of R12, 1919
© Ivan Gogin, 2014