SM U-84

History
German Empire
Name	U-84
Ordered	23 June 1915
Builder	Germaniawerft, Kiel
Yard number	254
Laid down	25 October 1915
Launched	22 July 1916
Commissioned	7 October 1916
Fate	26 January 1918 - Possibly rammed and depth charged by PC62 in St George's Channel and sunk at 51°53′N 5°44′W. 40 dead (all hands lost).
General characteristics
Displacement	808 t (795 long tons) surfaced; 946 t (931 long tons) submerged;
Length	70.06 m (229 ft 10 in) (o/a); 55.55 m (182 ft 3 in) (pressure hull);
Beam	6.30 m (20 ft 8 in) (oa); 4.15 m (13 ft 7 in) (pressure hull);
Height	8.00 m (26 ft 3 in)
Draught	4.02 m (13 ft 2 in)
Installed power	2 × 2,400 PS (1,765 kW; 2,367 shp) surfaced; 2 × 1,200 PS (883 kW; 1,184 shp) submerged;
Propulsion	2 shafts, 2 × 1.70 m (5 ft 7 in) propellers
Speed	16.8 knots (31.1 km/h; 19.3 mph) surfaced; 9.1 knots (16.9 km/h; 10.5 mph) submerged;
Range	11,220 nmi (20,780 km; 12,910 mi) at 8 knots (15 km/h; 9.2 mph) surfaced; 56 nmi (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged;
Test depth	50 m (160 ft)
Complement	4 officers, 31 enlisted
Armament	4 × 50 cm (19.7 in) torpedo tubes (two bow, two stern); 12-16 torpedoes; 1 × 10.5 cm (4.1 in) SK L/45 deck gun (from 1917);
Service record
Part of:	IV Flotilla; 3 December 1916 – 26 January 1918;
Commanders:	Kptlt. Walter Roehr; 17 October 1916 – 26 January 1918;
Operations:	8 patrols
Victories:	28 merchant ships sunk ; (84,906 GRT); 1 warship sunk ; (1,290 tons); 7 merchant ships damaged ; (42,149 GRT); 2 merchant ships taken as prize ; (3,462 GRT);

SM U-84 was one of the 329 submarines serving in the Imperial German Navy (Kaiserliche Marine) in World War I. U-84 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

Initially U-81 to U-83 had one 10.5 cm gun with 140-240 rounds. U-84 - U-86 on the other hand had two 8.8 cm guns. In 1917 U-84 - U-86 were refitted with a single 10.5 cm gun (240 rounds)

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