SM UC-42

History
German Empire
Name	UC-42
Ordered	20 November 1915
Builder	AG Vulcan, Hamburg
Yard number	75
Launched	21 September 1916
Commissioned	18 November 1916
Fate	Sunk by own mine, 10 September 1917
General characteristics
Class & type	Type UC II submarine
Displacement	400 t (390 long tons), surfaced; 480 t (470 long tons), submerged;
Length	49.45 m (162 ft 3 in) o/a; 40.30 m (132 ft 3 in) pressure hull;
Beam	5.22 m (17 ft 2 in) o/a; 3.65 m (12 ft) pressure hull;
Draught	3.68 m (12 ft 1 in)
Propulsion	2 × propeller shafts; 2 × 6-cylinder, 4-stroke diesel engines, 520 PS (380 kW; 510 shp); 2 × electric motors, 460 PS (340 kW; 450 shp);
Speed	11.7 knots (21.7 km/h; 13.5 mph), surfaced; 6.7 knots (12.4 km/h; 7.7 mph), submerged;
Range	9,410 nmi (17,430 km; 10,830 mi) at 7 knots (13 km/h; 8.1 mph) surfaced; 60 nmi (110 km; 69 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	50 m (160 ft)
Complement	26
Armament	6 × 100 cm (39.4 in) mine tubes; 18 × UC 200 mines; 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern); 7 × torpedoes; 1 × 8.8 cm (3.5 in) Uk L/30 deck gun;
Notes	48-second diving time
Service record
Part of:	I Flotilla; 1 January – 10 September 1917;
Commanders:	Kptlt. Otto Heinrich Tornow; 18 November 1916 – 17 July 1917; Oblt.z.S. Hans Albrecht Müller; 18 July – 10 September 1917;
Operations:	6 patrols
Victories:	13 merchant ships sunk ; (9,642 GRT); 1 auxiliary warship sunk ; (235 GRT); 1 warship damaged ; (1,210 tons);

SM UC-42 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 20 November 1915 and was launched on 21 September 1916. She was commissioned into the German Imperial Navy on 18 November 1916 as SM UC-42.

History

German Empire
Name	UC-42
Ordered	20 November 1915
Builder	AG Vulcan, Hamburg
Yard number	75
Launched	21 September 1916
Commissioned	18 November 1916
Fate	Sunk by own mine, 10 September 1917
General characteristics
Class & type	Type UC II submarine
Displacement	400 t (390 long tons), surfaced 480 t (470 long tons), submerged
Length	49.45 m (162 ft 3 in) o/a 40.30 m (132 ft 3 in) pressure hull
Beam	5.22 m (17 ft 2 in) o/a 3.65 m (12 ft) pressure hull
Draught	3.68 m (12 ft 1 in)
Propulsion	2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 520 PS (380 kW; 510 shp) 2 × electric motors, 460 PS (340 kW; 450 shp)
Speed	11.7 knots (21.7 km/h; 13.5 mph), surfaced 6.7 knots (12.4 km/h; 7.7 mph), submerged
Range	9,410 nmi (17,430 km; 10,830 mi) at 7 knots (13 km/h; 8.1 mph) surfaced 60 nmi (110 km; 69 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	26
Armament	6 × 100 cm (39.4 in) mine tubes 18 × UC 200 mines 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern) 7 × torpedoes 1 × 8.8 cm (3.5 in) Uk L/30 deck gun
Notes	48-second diving time
Service record
Part of:	I Flotilla 1 January – 10 September 1917
Commanders:	Kptlt. Otto Heinrich Tornow 18 November 1916 – 17 July 1917 Oblt.z.S. Hans Albrecht Müller 18 July – 10 September 1917
Operations:	6 patrols
Victories:	13 merchant ships sunk (9,642 GRT) 1 auxiliary warship sunk (235 GRT) 1 warship damaged (1,210 tons)