SM UB-20

	SM UB-45, a U-boat similar to UB-20
History
German Empire
Name	UB-20
Ordered	30 April 1915
Builder	Blohm & Voss, Hamburg
Yard number	250
Launched	26 September 1915
Completed	8 February 1916
Commissioned	10 February 1916
Fate	Sunk by mine, 28 July 1917
General characteristics
Class & type	Type UB II submarine
Displacement	263 t (259 long tons) surfaced; 292 t (287 long tons) submerged;
Length	36.13 m (118 ft 6 in) o/a; 27.13 m (89 ft) pressure hull;
Beam	4.36 m (14 ft 4 in) o/a; 3.85 m (12 ft 8 in) pressure hull;
Draught	3.70 m (12 ft 2 in)
Propulsion	1 × propeller shaft; 2 × 6-cylinder diesel engine, 284 PS (209 kW; 280 bhp); 2 × electric motor, 280 PS (210 kW; 280 shp);
Speed	9.15 knots (16.95 km/h; 10.53 mph) surfaced; 5.81 knots (10.76 km/h; 6.69 mph) submerged;
Range	6,450 nmi (11,950 km; 7,420 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 m (160 ft)
Complement	2 officers, 21 men
Armament	2 × 50 cm (19.7 in) torpedo tubes; 4 × torpedoes (later 6); 1 × 5 cm SK L/40 gun;
Notes	45-second diving time
Service record
Part of:	Baltic Flotilla; 12 March 1916 – 26 March 1917; Flandern Flotilla; 26 March – 28 July 1917;
Commanders:	Oblt.z.S. Max Viebeg; 10 February 1916 – 31 January 1917; Oblt.z.S. Hermann Glimpf; 1 February – 28 July 1917;
Operations:	15 patrols
Victories:	13 merchant ships sunk ; (10,230 GRT); 1 merchant ship damaged ; (7,241 GRT); 1 merchant ship taken as prize ; (1,047 GRT);

SM UB-20 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 26 September 1915. She was commissioned into the German Imperial Navy on 10 February 1916 as SM UB-20. The submarine sank 13 ships in 15 patrols for a total of 10,230 gross register tons (GRT). UB-20 was mined and sunk on 28 July 1917 at 51°21′N 2°38′E / 51.350°N 2.633°E / 51.350; 2.633. Fifteen crew members died in the event.

History
SM UB-45, a U-boat similar to UB-20
German Empire
Name	UB-20
Ordered	30 April 1915
Builder	Blohm & Voss, Hamburg
Yard number	250
Launched	26 September 1915
Completed	8 February 1916
Commissioned	10 February 1916
Fate	Sunk by mine, 28 July 1917
General characteristics
Class & type	Type UB II submarine
Displacement	263 t (259 long tons) surfaced 292 t (287 long tons) submerged
Length	36.13 m (118 ft 6 in) o/a 27.13 m (89 ft) pressure hull
Beam	4.36 m (14 ft 4 in) o/a 3.85 m (12 ft 8 in) pressure hull
Draught	3.70 m (12 ft 2 in)
Propulsion	1 × propeller shaft 2 × 6-cylinder diesel engine, 284 PS (209 kW; 280 bhp) 2 × electric motor, 280 PS (210 kW; 280 shp)
Speed	9.15 knots (16.95 km/h; 10.53 mph) surfaced 5.81 knots (10.76 km/h; 6.69 mph) submerged
Range	6,450 nmi (11,950 km; 7,420 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 m (160 ft)
Complement	2 officers, 21 men
Armament	2 × 50 cm (19.7 in) torpedo tubes 4 × torpedoes (later 6) 1 × 5 cm SK L/40 gun
Notes	45-second diving time
Service record
Part of:	Baltic Flotilla 12 March 1916 – 26 March 1917 Flandern Flotilla 26 March – 28 July 1917
Commanders:	Oblt.z.S. Max Viebeg 10 February 1916 – 31 January 1917 Oblt.z.S. Hermann Glimpf 1 February – 28 July 1917
Operations:	15 patrols
Victories:	13 merchant ships sunk (10,230 GRT) 1 merchant ship damaged (7,241 GRT) 1 merchant ship taken as prize (1,047 GRT)