| Career (German Empire) | |
|---|---|
| Name: | UC-78 |
| Ordered: | 12 January 1916[1] |
| Builder: | AG Vulcan, Hamburg[2] |
| Yard number: | 83[1] |
| Launched: | 8 December 1916[1] |
| Commissioned: | 10 January 1917[1] |
| Fate: | rammed and sunk by SS Queen Alexandra, 9 May 1918[1] |
| General characteristics | |
| Class and type: | German Type UC II submarine |
| Displacement: | 410 t (450 short tons), surfaced[2] 493 t (543 short tons), submerged |
| Length: | 165 ft 6 in (50.44 m)[2] |
| Beam: | 17 ft 4 in (5.28 m)[2] |
| Draft: | 12 ft 2 in (4 m)[3] |
| Propulsion: | 2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 500 bhp (370 kW)[3] 2 × electric motors, 460 shp (340 kW)[3] |
| Speed: | 11.8 knots (21.9 km/h), surfaced[2] 7.3 knots (13.5 km/h), submerged |
| Endurance: | 8,660 nautical miles @ 7 knots, surfaced[3] (16,040 km @ 13 km/h) 52 nautical miles @ 4 knots, submerged[3] (96 km @ 7.4 km/h) |
| Test depth: | 50 m (160 ft)[3] |
| Complement: | 26[3] |
| Armament: | 6 × 100 cm (39.4 in) mine tubes[3] 18 × UC 200 mines 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern) 7 × torpedoes 1 × 8.8 cm (3.46 in) KL/30 deck gun[2] |
| Notes: | 30-second diving time[2] |
SM UC-78 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 12 January 1916 and was launched on 8 December 1916. She was commissioned into the German Imperial Navy on 10 January 1917 as SM UC-78.[Note 1] In 12 patrols UC-78 was credited with sinking a single ship, either by torpedo or by mines laid. UC-78 was rammed and sunk by the British steamer Queen Alexandra west of Cherbourg on 9 May 1918.[1]
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