SM UB-18

	SM UB-45, a U-boat similar to UB-18
History
German Empire
Name	UB-18
Ordered	30 April 1915
Builder	Blohm & Voss, Hamburg
Yard number	248
Launched	21 August 1915
Completed	10 December 1915
Commissioned	11 December 1915
Fate	Rammed and sunk, 9 December 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 (13 ft) pressure hull;
Draught	3.70 m (12 ft 2 in)
Propulsion	1 × propeller shaft; 2 × four-stroke 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	6,650 nmi (12,320 km; 7,650 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:	Flanders Flotilla; 16 February 1916 – 9 December 1917;
Commanders:	Oblt.z.S. Franz Wäger; 11 December 1915 – 15 February 1916; Oblt.z.S. Otto Steinbrinck; 16 February – 27 October 1916; Oblt.z.S. Claus Lafrenz; 28 October 1916 – 7 July 1917; Oblt.z.S. Ulrich Meier; 8 July – 21 September 1917; Oblt.z.S. Georg Niemeyer; 22 September – 9 December 1917;
Operations:	31 patrols
Victories:	126 merchant ships sunk ; (129,783 GRT + Unknown GRT); 1 warship sunk ; (725 tons); 1 auxiliary warship sunk ; (1,058 GRT); 3 merchant ships damaged ; (3,217 GRT); 2 auxiliary warships damaged ; (4,359 GRT);

SM UB-18 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 21 August 1915. She was commissioned into the German Imperial Navy on 11 December 1915 as SM UB-18. The submarine sank 128 ships in 31 patrols for a total of 130,841 GRT and 725 tons, making her the 17th most successful U-boat in both world wars. UB-18 was rammed by the trawler Ben Lawer and sunk in the English Channel at 49°17′N 5°47′W / 49.283°N 5.783°W / 49.283; -5.783 on 9 December 1917.

History
SM UB-45, a U-boat similar to UB-18
German Empire
Name	UB-18
Ordered	30 April 1915
Builder	Blohm & Voss, Hamburg
Yard number	248
Launched	21 August 1915
Completed	10 December 1915
Commissioned	11 December 1915
Fate	Rammed and sunk, 9 December 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 (13 ft) pressure hull
Draught	3.70 m (12 ft 2 in)
Propulsion	1 × propeller shaft 2 × four-stroke 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	6,650 nmi (12,320 km; 7,650 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:	Flanders Flotilla 16 February 1916 – 9 December 1917
Commanders:	Oblt.z.S. Franz Wäger 11 December 1915 – 15 February 1916 Oblt.z.S. Otto Steinbrinck 16 February – 27 October 1916 Oblt.z.S. Claus Lafrenz 28 October 1916 – 7 July 1917 Oblt.z.S. Ulrich Meier 8 July – 21 September 1917 Oblt.z.S. Georg Niemeyer 22 September – 9 December 1917
Operations:	31 patrols
Victories:	126 merchant ships sunk (129,783 GRT + Unknown GRT) 1 warship sunk (725 tons) 1 auxiliary warship sunk (1,058 GRT) 3 merchant ships damaged (3,217 GRT) 2 auxiliary warships damaged (4,359 GRT)