SM UB-12

History
German Empire
Name	UB-12
Ordered	15 October 1914
Builder	AG Weser, Bremen
Yard number	221
Laid down	7 November 1914
Launched	2 March 1915
Commissioned	29 March 1915
Fate	Disappeared after 19 August 1918
General characteristics
Class & type	Type UB I submarine
Displacement	127 t (125 long tons) surfaced; 141 t (139 long tons) submerged;
Length	27.88 m (91 ft 6 in) (o/a)
Beam	3.15 m (10 ft 4 in)
Draft	3.03 m (9 ft 11 in)
Propulsion	1 × propeller shaft; 1 × Körting 4-cylinder diesel engine, 59 bhp (44 kW); 1 × Siemens-Schuckert electric motor, 119 shp (89 kW);
Speed	7.45 knots (13.80 km/h; 8.57 mph) surfaced; 6.24 knots (11.56 km/h; 7.18 mph) submerged;
Range	1,500 nmi (2,800 km; 1,700 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced; 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	50 metres (160 ft)
Complement	14
Armament	2 × 45 cm (17.7 in) bow torpedo tubes; 2 × torpedoes; 1 × 8 mm (0.31 in) machine gun;
Notes	33-second diving time
Service record
Part of:	Flandern Flotilla; 18 April 1915 – 19 August 1918;
Commanders:	Oblt.z.S. Hans Nieland; 29 March – 20 November 1915; Oblt.z.S. Wilhelm Kiel; 21 November 1915 – 25 June 1916; Oblt.z.S. Georg Gerth; 26 June – 4 November 1916; Oblt.z.S. Friedrich Moecke; 5 November 1916 – 19 January 1917; Oblt.z.S. Ernst Steindorff; 20 January – 7 August 1917; Oblt.z.S. Günther Wigankow; 8 August – 23 September 1917; Oblt.z.S. Wilhelm Braun; 24 September 1917 – 9 March 1918; Oblt.z.S. Freiherr Nikolaus von Lyncker; 10 March – 9 May 1918; Oblt.z.S. Ernst Schöller; 10 May – 19 August 1918;
Operations:	98 patrols
Victories:	17 merchant ships sunk ; (8,970 GRT); 1 warship sunk ; (995 tons); 5 auxiliary warships sunk ; (1,293 GRT); 1 merchant ship taken as prize ; (654 GRT);

SM UB-12 was a German Type UB I submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The submarine disappeared in August 1918.

UB-12 was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November. UB-12 was a little under 28 metres (92 ft) in length and displaced between 127 and 141 tonnes (125 and 139 long tons), depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. UB-12 was broken into sections and shipped by rail to Antwerp for reassembly. She was launched and commissioned as SM UB-12 in March 1915.

UB-12 spent her entire career in the Flanders Flotilla and sank 22 ships, about half of them British fishing vessels. The U-boat was also responsible for sinking the British destroyer HMS Laforey in 1917. By early 1917, UB-12 had been converted into a minelayer with the replacement of her torpedo tubes with four mine chutes. UB-12 disappeared after 19 August 1918.

History

German Empire
Name	UB-12
Ordered	15 October 1914
Builder	AG Weser, Bremen
Yard number	221
Laid down	7 November 1914
Launched	2 March 1915
Commissioned	29 March 1915
Fate	Disappeared after 19 August 1918
General characteristics
Class & type	Type UB I submarine
Displacement	127 t (125 long tons) surfaced 141 t (139 long tons) submerged
Length	27.88 m (91 ft 6 in) (o/a)
Beam	3.15 m (10 ft 4 in)
Draft	3.03 m (9 ft 11 in)
Propulsion	1 × propeller shaft 1 × Körting 4-cylinder diesel engine, 59 bhp (44 kW) 1 × Siemens-Schuckert electric motor, 119 shp (89 kW)
Speed	7.45 knots (13.80 km/h; 8.57 mph) surfaced 6.24 knots (11.56 km/h; 7.18 mph) submerged
Range	1,500 nmi (2,800 km; 1,700 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 metres (160 ft)
Complement	14
Armament	2 × 45 cm (17.7 in) bow torpedo tubes 2 × torpedoes 1 × 8 mm (0.31 in) machine gun
Notes	33-second diving time
Service record
Part of:	Flandern Flotilla 18 April 1915 – 19 August 1918
Commanders:	Oblt.z.S. Hans Nieland 29 March – 20 November 1915 Oblt.z.S. Wilhelm Kiel 21 November 1915 – 25 June 1916 Oblt.z.S. Georg Gerth 26 June – 4 November 1916 Oblt.z.S. Friedrich Moecke 5 November 1916 – 19 January 1917 Oblt.z.S. Ernst Steindorff 20 January – 7 August 1917 Oblt.z.S. Günther Wigankow 8 August – 23 September 1917 Oblt.z.S. Wilhelm Braun 24 September 1917 – 9 March 1918 Oblt.z.S. Freiherr Nikolaus von Lyncker 10 March – 9 May 1918 Oblt.z.S. Ernst Schöller 10 May – 19 August 1918
Operations:	98 patrols
Victories:	17 merchant ships sunk (8,970 GRT) 1 warship sunk (995 tons) 5 auxiliary warships sunk (1,293 GRT) 1 merchant ship taken as prize (654 GRT)