SM U-90

History

German Empire
Name:	U-90
Ordered:	23 June 1915
Builder:	Kaiserliche Werft Danzig
Yard number:	34
Laid down:	29 December 1915
Launched:	12 January 1917
Commissioned:	2 August 1917
Fate:	Surrendered 20 November 1918; broken up 1919–1920
General characteristics
Class and type:	German Type U 87 submarine
Displacement:	757 t (745 long tons) surfaced 998 t (982 long tons) submerged
Length:	65.80 m (215 ft 11 in) (o/a) 50.07 m (164 ft 3 in) (pressure hull)
Beam:	6.20 m (20 ft 4 in) (o/a) 4.18 m (13 ft 9 in) (pressure hull)
Height:	9.35 m (30 ft 8 in)
Draught:	3.88 m (12 ft 9 in)
Installed power:	2 × 2,400 PS (1,765 kW; 2,367 shp) surfaced 2 × 1,200 PS (883 kW; 1,184 shp) submerged
Propulsion:	2 shafts, 2 × 1.66 m (5 ft 5 in) propellers
Speed:	16.8 knots (31.1 km/h; 19.3 mph) surfaced 9.1 knots (16.9 km/h; 10.5 mph) submerged
Range:	11,380 nmi (21,080 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 56 nmi (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth:	50 m (160 ft)
Complement:	4 officers, 32 enlisted
Armament:	4 × 50 cm (19.7 in) torpedo tubes (two bow, two stern) 10-12 torpedoes 1 × 10.5 cm (4.1 in) deck gun
Service record
Part of:	Imperial German Navy: III Flotilla 10 September 1917 – 11 November 1918
Commanders:	Kptlt. Walter Remy 2 August 1917 – 31 July 1918 Oblt.z.S. Helmut Patzig 1–31 August 1918 Kptlt. Heinrich Jeß 1 September – 11 November 1918
Operations:	7 patrols
Victories:	30 merchant ships sunk (74,175 GRT) 2 ships damaged (8,594 GRT)

SM U-90 was a Type U 87 u-boat of the Imperial German Navy during World War I. Its commander Walter Remy made regular stops at remote island North Rona for provisions such as fresh mutton. On 15 May 1918, U-90 shelled the Hirta wireless station in St Kilda, Scotland. On 31 May 1918, U-90 torpedoed and sank USS President Lincoln, a former Hamburg America Line steamer that had been seized by the United States for troop transportation. From the U.S. Navy crew that abandoned the sinking vessel, U-90 captured Lieutenant Edouard Izac, eventually taking him to Germany. Izac later escaped German captivity and reported to the US Navy about German submarine movements.

German Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-90 had a displacement of 757 tonnes (745 long tons) when at the surface and 998 tonnes (982 long tons) while submerged. She had a total length of 65.80 m (215 ft 11 in), a pressure hull length of 50.07 m (164 ft 3 in), a beam of 6.20 m (20 ft 4 in), a height of 9.35 m (30 ft 8 in), and a draught of 3.88 m (12 ft 9 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,200 metric horsepower (880 kW; 1,200 shp) engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 metres (160 ft).

The submarine had a maximum surface speed of 15.6 knots (28.9 km/h; 18.0 mph) and a maximum submerged speed of 8.6 knots (15.9 km/h; 9.9 mph). When submerged, she could operate for 56 nautical miles (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph); when surfaced, she could travel 11,380 nautical miles (21,080 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph). U-90 was fitted with four 50 centimetres (20 in) torpedo tubes (two at the bow and two at the stern), ten to twelve torpedoes, and one 10.5-centimetre (4.1 in) deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).

...
Wikipedia