G4 1912
| No | Name | Builder | Laid down | Launched | Comm | Fate |
| SS19½, 1920- SS20 | G1 (ex-Seal) | Newport News | 2/1909 | 8/2/1911 | 10/1912 | stricken 3/1920 |
| SS26 | G4 (ex-Thrasher) | Cramp, Philadelphia | 7/1910 | 15/8/1912 | 1/1914 | stricken 9/1919 |
| SS27 | G2 (ex-Tuna) | Lake, Bridgeport | 10/1909 | 10/1/1912 | 2/1915 | stricken 4/1919 |
| SS31 | G3 (ex-Turbot) | Lake, Bridgeport | 3/1911 | 27/12/1913 | 3/1915 | stricken 5/1921 |
|
Displacement standard, t |
|
|
Displacement normal, t |
SS19½, 27: 400 / 516 SS26: 360 / 457 SS31: 393 / 460 |
|
Length, m |
49.1 |
|
Breadth, m |
4.00 |
|
Draught, m |
3.80 |
|
No of shafts |
2 |
|
Machinery |
SS19½, 27: 4 petrol engines / 2 electric motors SS26: 2 petrol engines / 2 electric motors SS31: 4 diesels / 2 electric motors |
|
Power, h. p. |
SS19½, 27: 1200 / 520 SS26: 1000 / 400 SS31: 1200 / 600 |
|
Max speed, kts |
SS19½, 27: 14 / 10 SS26, 31: 14 / 9.5 |
|
Fuel, t |
SS19½, 26, 27: petrol SS31: diesel oil |
| Endurance, nm (kts) |
SS19½, 27, 31: 2500 (8) / 70 (5) SS26: 1680 (8) / 40 (5) |
|
Armament |
SS19½, 26: 6 - 450 TT (bow, 6) SS27: 4 - 450 TT (bow, 8) SS31: 4 - 450 TT (bow, 10) |
|
Complement |
SS19½, 26, 27: 24 SS31: 25 |
|
Diving depth operational, m |
60 |
Ship project history: Experimental submarines which were falling out of the general tendency of development of American submarines. Most of them had petrol engines caused considerable inconveniences, later that machinery never used in the USN.
Modernizations: 1915, G1: 2 petrol engines were removed (600 / 520 hp).
Naval service: No significant events.
G1 1917
© Ivan Gogin, 2008-10