R1 1918
R13 1940
| No | Name | Builder | Laid down | Launched | Comm | Fate |
| SS78 | R1 | Fore River, Quincy | 10/1917 | 24/8/1918 | 12/1918 | stricken 11/1945 |
| SS79 | R2 | Fore River, Quincy | 10/1917 | 23/9/1918 | 1/1919 | stricken 11/1945 |
| SS80 | R3 | Fore River, Quincy | 12/1917 | 18/1/1919 | 4/1919 | to United Kingdom 1/1941 (P511) |
| SS81 | R4 | Fore River, Quincy | 10/1917 | 26/10/1918 | 3/1919 | stricken 7/1945 |
| SS82 | R5 | Fore River, Quincy | 10/1917 | 24/11/1918 | 4/1919 | stricken 10/1945 |
| SS83 | R6 | Fore River, Quincy | 12/1917 | 1/3/1919 | 5/1919 | stricken 10/1945 |
| SS84 | R7 | Fore River, Quincy | 12/1917 | 5/4/1919 | 6/1919 | stricken 10/1945 |
| SS85 | R8 | Fore River, Quincy | 3/1918 | 17/4/1919 | 7/1919 | stricken 5/1936 |
| SS86 | R9 | Fore River, Quincy | 3/1918 | 24/5/1919 | 7/1919 | stricken 10/1945 |
| SS87 | R10 | Fore River, Quincy | 3/1918 | 28/6/1919 | 8/1919 | stricken 7/1945 |
| SS88 | R11 | Fore River, Quincy | 3/1918 | 12/7/1919 | 9/1919 | stricken 10/1945 |
| SS89 | R12 | Fore River, Quincy | 3/1918 | 15/8/1919 | 9/1919 | foundered 12/6/1943 |
| SS90 | R13 | Fore River, Quincy | 3/1918 | 27/8/1919 | 10/1919 | stricken 10/1945 |
| SS91 | R14 | Fore River, Quincy | 11/1918 | 10/10/1919 | 12/1919 | stricken 5/1945 |
| SS92 | R15 | Union Iron Wks, San Francisco | 4/1917 | 10/12/1917 | 7/1918 | stricken 10/1945 |
| SS93 | R16 | Union Iron Wks, San Francisco | 4/1917 | 15/12/1917 | 8/1918 | stricken 7/1945 |
| SS94 | R17 | 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 | Union Iron Wks, San Francisco | 6/1917 | 8/1/1918 | 9/1918 | stricken 11/1945 |
| SS96 | R19 | Union Iron Wks, San Francisco | 6/1917 | 28/1/1918 | 10/1918 | to United Kingdom 3/1942 (P514) |
| SS97 | R20 | 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 SS97 - 104: 510 / 583 |
|
Length, m |
SS78 - 97: 56.8 SS97 - 104: 53.3 |
|
Breadth, m |
SS78 - 97: 5.50 SS97 - 104: 5.10 |
|
Draught, m |
4.40 |
|
No of shafts |
2 |
|
Machinery |
2 NLSE diesels / 2 electric motors |
|
Power, h. p. |
SS78 - 97: 1200 / 940 SS97 - 104: 1000 / 800 |
|
Max speed, kts |
SS78 - 97: 13.5 / 11 SS97 - 104: 14 / 11 |
|
Fuel, t |
diesel oil 75 |
| Endurance, nm (kts) | 4700 (6) / |
|
Armament |
SS78 - 97: 4 - 533 TT (bow, 8), 1 x 1 - 76/50 Mk 6 SS97 - 104: 4 - 450 TT (bow, 8), 1 x 1 - 76/50 Mk 6 |
|
Complement |
29 |
|
Diving depth operational, m |
60 |
Ship 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 differed by a little smaller displacement and 450mm TT instead of 533mm. R21-27 were appeared unsuccessful and stricken in the 1930s.
Saddle-tank hull.
Modernizations: 1939, most survived: - 1 x 1 - 76/23; + 1 x 1 - 12.7/90.
Naval service: R12 was lost 12/6/1943 off Key West (Florida) during training diving.
Launching of R12, 1919
© Ivan Gogin, 2008-10