SM UB-109

	UB-148 at sea, a U-boat similar to UB-109.
History
German Empire
Name	UB-109
Ordered	6 / 8 February 1917
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	315
Launched	7 July 1917
Commissioned	31 December 1917
Fate	Sunk by mine on 29 August 1918 at 51°3′N 1°44′E / 51.050°N 1.733°E
General characteristics
Class and type	Type UB III submarine
Displacement	510 t (500 long tons) surfaced; 629 t (619 long tons) submerged;
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.70 m (12 ft 2 in)
Propulsion	2 × propeller shaft; 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW); 2 × Maffei electric motors, 780 shp (580 kW);
Speed	13.3 knots (24.6 km/h; 15.3 mph) surfaced; 7.5 knots (13.9 km/h; 8.6 mph) submerged;
Range	7,420 nmi (13,740 km; 8,540 mi) at 6 knots (11 km/h; 6.9 mph) surfaced; 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	50 m (160 ft)
Complement	3 officers, 31 men
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern); 10 torpedoes; 1 × 8.8 cm (3.46 in) deck gun;
Service record
Part of:	Flandern I Flotilla; 30 March – 29 August 1918;
Commanders:	Oblt.z.S. / Kptlt. Kurt Ramien; 31 December 1917 – 29 August 1918;
Operations:	3 patrols
Victories:	7 merchant ships sunk ; (14,092 GRT)

SM UB-109 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 31 December 1917 as SM UB-109.^{[Note 1]}

UB-109 was sunk by mine in the English Channel on 29 August 1918^[2] and underwater scanning of the area covered by the Dover Barrage shows her wreck broken in half.^[4]

^ Rössler 1979, p. 66.
^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.
^ Helgason, Guðmundur. "WWI U-boat commanders: Kurt Ramien (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.
^ "The Maritime Archaeology of the Dover Barrage". Wessex archaeology on line. Retrieved 1 September 2015.

Cite error: There are <ref group=Note> tags on this page, but the references will not show without a {{reflist|group=Note}} template (see the help page).

[FOOTNOTERössler197966-1] Rössler 1979, p. 66.

[FOOTNOTEGröner199125–30-2] ^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.

[3] Helgason, Guðmundur. "WWI U-boat commanders: Kurt Ramien (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.

[5] "The Maritime Archaeology of the Dover Barrage". Wessex archaeology on line. Retrieved 1 September 2015.

[1]

[2]

[3]

[Note 1]

[4]

History
UB-148 at sea, a U-boat similar to UB-109.
German Empire
Name	UB-109
Ordered	6 / 8 February 1917^[1]
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	315
Launched	7 July 1917^[2]
Commissioned	31 December 1917^[2]
Fate	Sunk by mine on 29 August 1918 at 51°3′N 1°44′E / 51.050°N 1.733°E / 51.050; 1.733^[2]
General characteristics ^[2]
Class and type	Type UB III submarine
Displacement	510 t (500 long tons) surfaced 629 t (619 long tons) submerged
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.70 m (12 ft 2 in)
Propulsion	2 × propeller shaft 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW) 2 × Maffei electric motors, 780 shp (580 kW)
Speed	13.3 knots (24.6 km/h; 15.3 mph) surfaced 7.5 knots (13.9 km/h; 8.6 mph) submerged
Range	7,420 nmi (13,740 km; 8,540 mi) at 6 knots (11 km/h; 6.9 mph) surfaced 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	3 officers, 31 men^[2]
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern) 10 torpedoes 1 × 8.8 cm (3.46 in) deck gun
Service record
Part of:	Flandern I Flotilla 30 March – 29 August 1918
Commanders:	Oblt.z.S. / Kptlt. Kurt Ramien^[3] 31 December 1917 – 29 August 1918
Operations:	3 patrols
Victories:	7 merchant ships sunk (14,092 GRT)