The German Type UE I submarine was an ocean-going single-hull submarine with saddle tanks built by AG Vulkan in Hamburg and Kaiserliche Werft Danzig. The Type UE I was equipped with two six-cylinder Benz engines for 900 horsepower (670 kW) for a surface top speed of 9.6 knots (17.8 km/h; 11.0 mph) to 10.6 knots (19.6 km/h; 12.2 mph). Armed with a single torpedo tube forward and aft, plus one 8.8 cm (3.5 in) SK L/30 deck gun (U-72 received a 10.5 cm (4.1 in) SK L/45 gun in 1917), its main weapon were the 38 mines in two minelaying tubes. The boats were crewed by four officers and 28 men for a complement of 32.^[1]

Quick Facts Class overview, General characteristics ...

Class overview
Builders	AG Vulkan, Hamburg; Kaiserliche Werft Danzig
Operators	Imperial German Navy
Preceded by	Type U 66
Succeeded by	Type U 81
Completed	10
Lost	7
General characteristics
Displacement	755 tonnes (743 long tons) surfaced 832 tonnes (819 long tons) submerged[1]
Length	56.8 m (186 ft 4 in) (o/a)[1] 46.66 m (153 ft 1 in) (pressure hull)[2]
Beam	5.9 m (19 ft 4 in) (o/a)[1] 5 m (16 ft 5 in) (pressure hull)[2]
Height	8.25 m (27 ft 1 in)[2]
Draught	4.86 m (15 ft 11 in)[1]
Propulsion	900 hp (670 kW) surfaced 660 kW (890 hp) submerged[1]
Speed	10.6 knots (19.6 km/h; 12.2 mph) surfaced 7.9 knots (14.6 km/h; 9.1 mph) submerged[1]
Range	7,880 nmi (14,590 km; 9,070 mi) at 7 kn surfaced 83 nmi (154 km; 96 mi) at 4 kn submerged
Complement	32 men[1]
Armament	One 50 cm (20 in) torpedo tubes forward and one 50 cm torpedo tubes aft plus one 8.8 cm (3.5 in) SK L/30 or 10.5 cm (4.1 in) SK L/45 deck gun two minelaying tubes for 38 mines[1]

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