Engineering:Type U 9 submarine

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Short description: German pre-World War I submarine class

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Type U 9 was a class of four gasoline-powered U-boats built between 1908 and 1911 for the Imperial German Navy. The boats were commissioned in 1911 and 1912 and saw service during World War I. Three of the boats were lost during the war, with one, Script error: The function "ship_prefix_templates" does not exist., surviving to surrender in 1918.

Design

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[lower-alpha 1] 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]

List of Type U 9 boats

All four Type U 9 boats were built at Kaiserliche Werft Danzig.

Name Launched[3] Commissioned[3] Merchant ships sunk
(GRT)[3] 		Warships sunk
(tons)[3] 		Fate[1]
Script error: The function "ship_prefix_templates" does not exist. 22 Feb 1910 18 Apr 1910 14 (8,636) 5 (44,715) Surrendered 26 November 1918 at Dover. Scrapped at Morecambe in 1919.
Script error: The function "ship_prefix_templates" does not exist. 24 Jan 1911 31 Aug 1911 7 (1,651) None Lost after 27 May 1916 in the Gulf of Finland.
Script error: The function "ship_prefix_templates" does not exist. 2 Apr 1910 21 Sep 1910 None None Sunk on 9 December 1914 after hitting a mine off the coast of Belgium in the southern North Sea.
Script error: The function "ship_prefix_templates" does not exist. 6 May 1910 13 Aug 1911 1 (1,005) 1 (810) Sunk on 10 March 1915 in the North Sea.

Notes

  1. ↑ Constructional diving depth had a safety factor of 2.5, which meant that crushing depth was 2.5 times construction diving depth.[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 Möller & Brack 2004, p. 22.
  2. ↑ 2.0 2.1 Rössler 1981, p. 26.
  3. ↑ 3.0 3.1 3.2 3.3 Herzog 1993, p. 67.

Bibliography

  • Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. 2. London: Conway Maritime Press. ISBN 0-85177-593-4. 
  • Herzog, Bodo (1993) (in de). Deutsche U-Boote : 1906 - 1966. Erlangen: Müller. ISBN 9783860700365. 
  • Möller, Eberhard; Brack, Werner (2004). The Encyclopedia of U-Boats. London: Chatham. ISBN 1-85367-623-3. 
  • Rössler, Eberhard (1981). The U-boat: The evolution and technical history of German submarines. London: Cassell & Co. ISBN 0-304-36120-8. 

Template:U-9 class submarines



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