NAVYPEDIA

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M1 1918

Ships

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

Technical data

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

Standard scale images

Graphics

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.