Class overview | |
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Builders | Kaiserliche Werft Danzig |
Operators | ![]() |
Preceded by | Type U 5 |
Succeeded by | Type U 13 |
Completed | 4 |
Lost | 3 |
General characteristics | |
Displacement | |
Length |
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Beam |
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Height | 7.05 m (23 ft 2 in) |
Draught | 3.13 m (10 ft 3 in) |
Installed power |
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Propulsion |
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Speed |
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Range |
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Test depth | 50 m (160 ft) |
Complement | 4 officers, 25 enlisted |
Armament |
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Type U9 was a class of U-boats built during World War I by the Kaiserliche Marine.
Type U 9s had an overall length of 57.38 m (188 ft 3 in) The boats' beam was 6.00 m (19 ft 8 in), the draught was 3.65 m (12 ft 0 in). The boats displaced 493 tonnes (485 long tons) when surfaced and 611 t (601 long tons) when submerged. [1]
Type U 9s were fitted with two Körting 6-cylinder and two 8-cylinder two-stroke paraffin engines with a total of 1,000 metric horsepower (735 kW ; 986 bhp ) for use on the surface and two SSW double-acting electric motors with a total of 860 kW (1,169 PS; 1,153 shp) for underwater use. These engines powered two shafts, which gave the boats a top surface speed of 14.2 knots (26.3 km/h; 16.3 mph), and 8.1 knots (15.0 km/h; 9.3 mph) when submerged. Cruising range was 3,250 nautical miles (6,020 km; 3,740 mi) at 9 knots (17 km/h; 10 mph) on the surface and 80 nautical miles (150 km; 92 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged. [1] Constructional diving depth [a] was 50 m (164 ft 1 in). [2]
The U-boats were armed with four 45 cm (18 in) torpedo tubes, two fitted in the bow and two in the stern, and carried six torpedoes. The boats' complement was 4 officers and 25 enlisted. [1]
Name | launched [3] | commissioned [3] | merchant ships sunk (nbr / GRT ) [3] | warships sunk ( nbr / tons ) [3] | Fate [1] |
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U-9 | 22 February 1910 | 18 April 1910 | 13 / 8.636 | 5 / 44.173 | Surrendered 16 November 1918. Scrapped at Morecambe in 1919. |
U-10 | 24 January 1911 | 31 August 1911 | 7 / 1.625 | none | Sunk after 27 May 1916 in the Gulf of Finland. |
U-11 | 2 April 1910 | 21 September 1910 | none | none | Sunk on 9 December 1914 in the English Channel. |
U-12 | 6 May 1910 | 13 August 1911 | 1 / 3.738 | 1 / 820 | Sunk on 10 March 1915 in the North Sea. |