"M" Class Submarine (1917)

Three of four projected "M" class submarine monitors were completed for the Royal Navy.

Only M 1 saw war service.

Overview of 4 vessels
Citations for this data available on individual ship pages
Name	Builder	Laid Down	Launched	Completed	Fate
M 1	Vickers		9 Jul, 1917		Collision 12 Nov, 1925
M 2	Vickers		19 Oct, 1918		Foundered 26 Jan, 1932
M 3	Armstrong		19 Oct, 1918		Sold Feb, 1932
M 4	Armstrong		20 Jul, 1919		Cancelled 1918

Armament

Guns

• one 12-in 40 cal Mark IX, 50 shells

The 12-in gun could train 15 degrees to either side, elevate 20 degrees or depress 5 degrees.

It proved remarkable workable.

Torpedoes

M 1, M 2:

• four 18-in tubes forward, eight torpedoes

M 3:

• four 21-in tubes forward, eight torpedoes

See Also

• Wikipedia