SM U-84

Last updated

History
War Ensign of Germany 1903-1918.svg German Empire
NameU-84
Ordered23 June 1915
Builder Germaniawerft, Kiel
Yard number254
Laid down25 October 1915
Launched22 July 1916
Commissioned7 October 1916
Fate26 January 1918 - Possibly rammed and depth charged by PC62 in St George's Channel and sunk at 51°53′N5°44′W / 51.883°N 5.733°W / 51.883; -5.733 . 40 dead (all hands lost). [1]
General characteristics [2]
Displacement
  • 808 t (795 long tons) surfaced
  • 946 t (931 long tons) submerged
Length
Beam
  • 6.30 m (20 ft 8 in) (oa)
  • 4.15 m (13 ft 7 in) (pressure hull)
Height8.00 m (26 ft 3 in)
Draught4.02 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
Propulsion2 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 depth50 m (160 ft)
Complement4 officers, 31 enlisted
Armament
Service record
Part of:
  • IV Flotilla
  • 3 December 1916 – 26 January 1918
Commanders:
  • Kptlt. Walter Roehr [3]
  • 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. [1]

Contents

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) [1]

Design

German Type U 81 submarines were preceded by the shorter Type UE I submarines. U-84 had a displacement of 808 tonnes (795 long tons) when at the surface and 946 tonnes (931 long tons) while submerged. [2] She had a total length of 70.06 m (229 ft 10 in), a pressure hull length of 55.55 m (182 ft 3 in), a beam of 6.30 m (20 ft 8 in), a height of 8 m (26 ft 3 in), and a draught of 4.02 m (13 ft 2 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,200 metric horsepower (880 kW; 1,200 shp) engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 metres (160 ft). [2]

The submarine had a maximum surface speed of 16.8 knots (31.1 km/h; 19.3 mph) and a maximum submerged speed of 9.1 knots (16.9 km/h; 10.5 mph). [2] When submerged, she could operate for 56 nautical miles (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph); when surfaced, she could travel 11,220 nautical miles (20,780 km; 12,910 mi) at 8 knots (15 km/h; 9.2 mph). U-84 was fitted with four 50 centimetres (20 in) torpedo tubes (two at the bow and two at the stern), twelve to sixteen torpedoes, and one 10.5 cm (4.1 in) SK L/45 deck gun. She had a complement of thirty-five (thirty-one crew members and four officers). [2]

Summary of raiding history

DateNameNationalityTonnage [Note 1] Fate [4]
14 December 1916 Aamot Flag of Norway.svg  Norway 1,362Captured as prize
18 December 1916 Malcolm Flag of Sweden.svg  Sweden 2,100Captured as prize
9 January 1917 Alexandrian Civil Ensign of the United Kingdom.svg  United Kingdom 4,467Damaged
10 January 1917 Bergenhus Flag of Norway.svg  Norway 3,606Sunk
12 January 1917 Auchencrag Civil Ensign of the United Kingdom.svg  United Kingdom 3,916Sunk
15 January 1917 Kinpurney Civil Ensign of the United Kingdom.svg  United Kingdom 1,944Sunk
15 January 1917 Omsk Flag of Denmark.svg  Denmark 1,574Sunk
20 January 1917 Bulgarian Civil Ensign of the United Kingdom.svg  United Kingdom 2,515Sunk
20 January 1917 Neuquen Civil Ensign of the United Kingdom.svg  United Kingdom 3,583Sunk
17 February 1917 Bayonne Flag of France.svg  France 2,589Sunk
17 February 1917 Romsdalen Civil Ensign of the United Kingdom.svg  United Kingdom 2,548Sunk
18 February 1917 Berrima Civil Ensign of the United Kingdom.svg  United Kingdom 11,137Damaged
18 February 1917 Hunsworth Government Ensign of the United Kingdom.svg  United Kingdom 2,991Damaged
18 February 1917 Juno Flag of Norway.svg  Norway 2,416Sunk
18 February 1917 Valdes Civil Ensign of the United Kingdom.svg  United Kingdom 2,233Sunk
21 February 1917 Dukat Flag of Norway.svg  Norway 1,408Sunk
22 February 1917 Invercauld Civil Ensign of the United Kingdom.svg  United Kingdom 1,416Sunk
13 April 1917 Argyll Civil Ensign of the United Kingdom.svg  United Kingdom 3,547Sunk
13 April 1917 Lime Branch Civil Ensign of the United Kingdom.svg  United Kingdom 5,379Damaged
18 April 1917 Cragoswald Civil Ensign of the United Kingdom.svg  United Kingdom 3,235Sunk
18 April 1917 Rowena Civil Ensign of the United Kingdom.svg  United Kingdom 3,017Sunk
19 April 1917 Elswick Manor Civil Ensign of the United Kingdom.svg  United Kingdom 3,943Sunk
20 April 1917 Malakand Civil Ensign of the United Kingdom.svg  United Kingdom 7,653Sunk
1 July 1917 Bachi Flag of Spain.svg  Spain 2,184Sunk
1 July 1917 Demerara Civil Ensign of the United Kingdom.svg  United Kingdom 11,484Damaged
4 July 1917 Goathland Civil Ensign of the United Kingdom.svg  United Kingdom 3,044Sunk
7 July 1917 Condesa Civil Ensign of the United Kingdom.svg  United Kingdom 8,557Sunk
7 July 1917 Oxø Flag of Norway.svg  Norway 831Sunk
12 August 1917 Ursus Minor Flag of Norway.svg  Norway 623Sunk
13 August 1917 HMS Bergamot Naval Ensign of the United Kingdom.svg  Royal Navy 1,290Sunk
24 November 1917 Actaeon Flag of the United States (1912-1959).svg  United States 4,999Sunk
1 December 1917 Antonios Stathatos Flag of Greece (1822-1978).svg  Greece 2,743Sunk
2 December 1917 Birchgrove Civil Ensign of the United Kingdom.svg  United Kingdom 2,821Sunk
9 January 1918 Bayvoe Civil Ensign of the United Kingdom.svg  United Kingdom 2,979Sunk
10 January 1918 Cardiff Civil Ensign of the United Kingdom.svg  United Kingdom 2,808Damaged
11 January 1918 Mereddio Civil Ensign of the United Kingdom.svg  United Kingdom 3,069Sunk
12 January 1918 Chateau Laffite Flag of France.svg  France 1,913Sunk
17 January 1918 Messidor Civil Ensign of the United Kingdom.svg  United Kingdom 3,883Damaged

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References

Notes

  1. ↑ Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

Citations

  1. 1 2 3 Helgason, Guðmundur. "WWI U-boats: U 84". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 25 January 2010.
  2. 1 2 3 4 5 Gröner 1991, pp. 12–14.
  3. ↑ Helgason, Guðmundur. "WWI U-boat commanders: Walter Roehr (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 20 January 2015.
  4. ↑ Helgason, Guðmundur. "Ships hit by U 84". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 20 January 2015.

Bibliography

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