History
German Empire
Name	U-37
Ordered	12 June 1912
Builder	Germaniawerft, Kiel
Yard number	197
Laid down	2 January 1913
Launched	25 August 1914
Commissioned	9 December 1914
Fate	Struck mine on 30 April 1915 in Straits of Dover
General characteristics
Class and type	German Type U 31 submarine
Displacement	685 t (674 long tons) (surfaced) 878 t (864 long tons) (submerged)
Length	64.70 m (212 ft 3 in) (o/a) 52.36 m (171 ft 9 in) (pressure hull)
Beam	6.32 m (20 ft 9 in) (o/a) 4.05 m (13 ft 3 in) (pressure hull)
Draught	3.56 m (11 ft 8 in)
Installed power	2 × 1,850 PS (1,361 kW; 1,825 shp) diesel engines 2 × 1,200 PS (883 kW; 1,184 shp) Doppelmodyn
Propulsion	2 × shafts 2 × 1.60 m (5 ft 3 in) propellers
Speed	16.4 knots (30.4 km/h; 18.9 mph) (surfaced) 9.7 knots (18.0 km/h; 11.2 mph) (submerged)
Range	8,790 nmi (16,280 km; 10,120 mi) at 8 knots (15 km/h; 9.2 mph) (surfaced) 80 nmi (150 km; 92 mi) at 5 knots (9.3 km/h; 5.8 mph) (submerged)
Test depth	50 m (164 ft 1 in)
Boats & landing craft carried	1 dinghy
Complement	4 officers, 31 enlisted
Armament	four 50 cm (20 in) torpedo tubes (2 each bow and stern) 6 torpedoes two 8.8 cm (3.5 in) Uk L/30 deck guns
Service record
Part of:	II Flotilla Unknown start – 30 April 1915
Commanders:	Kptlt. Erich Wilcke[1] 9 December 1914 – 30 April 1915
Operations:	1 patrol
Victories:	2 merchant ships sunk (2,811 GRT) 1 merchant ship damaged (3,459 GRT)

SM U-37^{[Note 1]} was one of the 329 submarines serving in the Imperial German Navy in World War I. U-37 was engaged in naval warfare and took part in the First Battle of the Atlantic.

Design

German Type U 31 submarines were double-hulled ocean-going submarines similar to Type 23 and Type 27 subs in dimensions and differed only slightly in propulsion and speed. They were considered very good high sea boats with average manoeuvrability and good surface steering.^[2]

U-37 had an overall length of 64.70 m (212 ft 3 in), her pressure hull was 52.36 m (171 ft 9 in) long. The boat's beam was 6.32 m (20 ft 9 in) (o/a), while the pressure hull measured 4.05 m (13 ft 3 in). Type 31s had a draught of 3.56 m (11 ft 8 in) with a total height of 7.68–8.04 m (25 ft 2 in – 26 ft 5 in). The boats displaced a total of 971 tonnes (956 long tons); 685 t (674 long tons) when surfaced and 878 t (864 long tons) when submerged.^[2]

U-37 was fitted with two Germania 6-cylinder two-stroke diesel engines with a total of 1,850 metric horsepower (1,361 kW; 1,825 bhp) for use on the surface and two Siemens-Schuckert double-acting electric motors with a total of 1,200 PS (883 kW; 1,184 shp) for underwater use. These engines powered two shafts each with a 1.60 m (5 ft 3 in) propeller, which gave the boat a top surface speed of 16.4 knots (30.4 km/h; 18.9 mph), and 9.7 knots (18.0 km/h; 11.2 mph) when submerged. Cruising range was 8,790 nautical miles (16,280 km; 10,120 mi) at 8 knots (15 km/h; 9.2 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).^[2]

The U-boat was armed with four 50 cm (20 in) torpedo tubes, two fitted in the bow and two in the stern, and carried 6 torpedoes. Additionally U-37 was equipped in 1915 with two 8.8 cm (3.5 in) Uk L/30 deck guns. The boat's complement was 4 officers and 31 enlisted.^[2]

Summary of raiding history

Date	Name	Nationality	Tonnage[Note 2]	Fate[3]
25 March 1915	Delmira	United Kingdom	3,459	Damaged
31 March 1915	Emma	France	1,617	Sunk
1 April 1915	Seven Seas	United Kingdom	1,194	Sunk

References

Bibliography

• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

External links

• Helgason, Guðmundur. "WWI U-boats: U 37". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.