M1 1918
| No | Name | Yard No | Builder | Laid down | Launched | Comm | Fate |
| SS47 | M1 | 223 | Fore River, Quincy | 7.1914 | 14.9.1915 | 2.1918 | stricken 3.1922 |
|
Displacement standard, t |
|
|
Displacement normal, t |
488 / 676 |
|
Length, m |
59.8 |
|
Breadth, m |
5.80 |
|
Draught, m |
3.40 |
|
No of shafts |
2 |
|
Machinery |
2 NLSE diesels / 2 electric motors |
|
Power, h. p. |
840 / 680 |
|
Max speed, kts |
14 / 10.5 |
|
Fuel, t |
diesel oil 83 |
| Endurance, nm(kts) | 2750(11) / 150(5) |
|
Armament |
1 x 1 - 76/23 Mk IX, 4 - 450 TT (bow, 8) |
|
Complement |
28 |
|
Diving depth operational, m |
60 |
Project history: M1 was the first US double-hulled submarine. This type of construction was adopted because earlier single-hull types had insufficient reserve buoyancy. M1 had the same military characteristics as the 'L' class, but was about 20% larger, with about 27% reserve buoyancy, compared to 11.5% for Lake submarines, and 15.5% in Holland's 'L'. Seaworthiness was satisfactory, but the submarine was too crowded internally; she was considered less habitable than the single-hull types. In addition, when passing from submerged to surfaced condition (or vice versa), she had a considerable negative metacentric height, and tended to take a large list. This problem was solved in the 'T' (AA) class.
Modernizations: None.
Naval service: No significant events.
M1 1918
© Ivan Gogin, 2014