SM U-9

U-9 ready for patrol.
History
German Empire
Name:	U-9
Ordered:	15 July 1908
Builder:	Kaiserliche Werft, Danzig
Cost:	2,140,000 Goldmark
Launched:	22 February 1910
Commissioned:	18 April 1910
Fate:	Surrendered 26 November 1918. Broken up at Morecambe in 1919.
General characteristics
Class and type:	German Type U 9 submarine
Displacement:	493 tonnes (485 long tons) surfaced 611 tonnes (601 long tons) submerged
Length:	57.38 m (188 ft 3 in) (o/a) 48 m (157 ft 6 in) (pressure hull)
Beam:	6 m (19 ft 8 in) (o/a) 3.65 m (12 ft) (pressure hull)
Height:	7.05 m (23 ft 2 in)
Draught:	3.13 m (10 ft 3 in)
Installed power:	2 × Körting 6-cylinder and 2 × Körting 8-cylinder two stroke paraffin motors with a total of 1,000 PS (740 kW; 990 shp) 2 × SSW electric motors with 1,160 PS (850 kW; 1,140 shp) 550 rpm surfaced 460 rpm submerged
Propulsion:	2 shafts 2 × 1.45 m (4 ft 9 in) propellers
Speed:	14.2 knots (26.3 km/h; 16.3 mph) surfaced 8.1 knots (15.0 km/h; 9.3 mph) submerged
Range:	1,800 nmi (3,300 km; 2,100 mi) at 14 knots (26 km/h; 16 mph) 80 nmi (150 km; 92 mi) at 5 knots (9.3 km/h; 5.8 mph)
Test depth:	50 m (160 ft)
Boats & landing craft carried:	1 dinghy
Complement:	4 officers, 25 enlisted
Armament:	four 45 cm (17.7 in) torpedo tubes (2 each bow and stern) 6 torpedoes 1 × 3.7 cm (1.5 in) Hotchkiss gun 1 × 5 cm (2 in) SK L/40 gun (from 1915) 1 × machine gun 12 P-Mines (March–December 1916)
Service record
Part of:	I Flotilla 1 August 1914 – 7 July 1915 Baltic Flotilla 7 July 1914 – 29 April 1916 Training Flotilla 20 April 1916 – 11 November 1918
Commanders:	Kptlt. Otto Weddigen 1 August 1914 – 11 January 1915 Kptlt. Johannes Spieß 12 January 1915 – 19 April 1916
Operations:	7 patrols
Victories:	14 merchant ships sunk (9,715 GRT) 4 warships sunk (43,350 tons)
Awards:	Iron Cross

SM U-9 was a German Type U 9 U-boat. She was one of 329 submarines serving in the Imperial German Navy, and engaged in commerce raiding (Handelskrieg) during World War I.

Her construction was ordered on 15 July 1908 and her keel was laid down by Kaiserliche Werft in Danzig. She was launched on 22 February 1910 and commissioned on 18 April 1910.

U-9 had an overall length of 57.38 m (188 ft 3 in), her pressure hull was 48 m (157 ft 6 in) long. The boat's beam was 6 m (19 ft 8 in) (o/a), while the pressure hull measured 3.65 m (12 ft 0 in). She had a draught of 3.13 m (10 ft 3 in) with a total height of 7.05 m (23 ft 2 in). The boat displaced 493 t (485 long tons) when surfaced and 611 t (601 long tons) when submerged.

U-9 was fitted with two Körting 8-cylinder plus two Körting 6-cylinder two-stroke petrol engines with a total of 1,000 metric horsepower (735 kW; 986 bhp) for use on the surface and two Siemens-Schuckert double-acting electric motors plus two electric motors with a total of 1,160 PS (853 kW; 1,144 shp) for underwater use. These engines powered two shafts each with a 1.45 m (4.8 ft) propeller, which gave the boat 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 1,800 nautical miles (3,300 km; 2,100 mi) at 14 knots (26 km/h; 16 mph) on the surface, and 80 nmi (150 km; 92 mi) at 5 knots (9.3 km/h; 5.8 mph) under water. Diving depth was 50 m (164 ft 1 in).