WWI U-boat Types

Type Large Ms.

Ocean-going diesel-powered torpedo attack boats class

Construction history of type Large Ms.

U-boats	#	Shipyard	Werk #	Built during
U 135 - U 138	4	Kaiserliche Werft, Danzig		1916 - 1918

U 135 of type Large Ms

These vessels were intended for deep sea usage and were very seaworthy and relatively comfortable. Average manoeuvrability.

Sources
Gröner, E. (1991). German Warships 1815-1945, vol 2. U-boats and mine warfare vessels.

All U-boats of type Large Ms.

Below are the 4 commissioned U-boats of this type.

U 135, U 136, U 137 and U 138

Technical information for type Large Ms.

Displacement: (tons)	1175 (sf) 1534 (sm) 1880 (total)
Length: (m)	83,50 oa 65,57 ph
Beam: (m)	7,54 oa 4,85 ph
Draught: (draft)	4,26 m
Height:	9,46 m
Power: (hp)	3500 (sf) 1690 (sm)

Speed: (knots)	17,0 (sf) 8,1 (sm)
Range: (miles / knots)	10,000/8 (sf) 50/4,5 (sm)
Torpedoes:	14 4/2 (bow / stern tubes)
Mines:	No mines carried
Deck gun:	10,5cm 540 rounds
Crew:	46 men
Max depth:	ca. 75 m (246 feet)

sm = submerged, sf = surfaced, ph = pressure hull,
oa = overall, hp = horsepower.