Type U 3 submarine

Class overview
Builders	Kaiserliche Werft Danzig
Operators	Imperial German Navy
Preceded by	U 2
Succeeded by	Type U 5
Completed	2
Lost	0
General characteristics
Displacement	421 t (414 long tons) surfaced; 510 t (500 long tons) submerged;
Length	51.28 m (168 ft 3 in) (o/a); 45.00 m (147 ft 8 in) (pressure hull);
Beam	5.6 m (18 ft 4 in)
Draught	3.05 m (10 ft)
Propulsion	2 shafts; 2 × Körting 8-cylinder two stroke paraffin motors with 600 PS (440 kW; 590 shp); 2 × Siemens-Schuckert electric motors with 1,030 PS (760 kW; 1,020 shp);
Speed	11.8 knots (21.9 km/h; 13.6 mph) surfaced; 9.4 knots (17.4 km/h; 10.8 mph) submerged;
Range	1,800 nmi (3,300 km; 2,100 mi) at 12 knots (22 km/h; 14 mph) surfaced; 50 nmi (93 km; 58 mi) at 5 knots (9.3 km/h; 5.8 mph);
Complement	3 officers, 19 men
Armament	4 × torpedo tubes (2 bow, 2 stern); 6 × 45 cm (18 in) torpedoes ; until end 1914: 1 × 3.7 cm (1.5 in) Hotchkiss gun; from 1915 on U-3: 1 × 5 cm (2.0 in) SK L/40 gun;

Type U 3 was a class of U-boats built during World War I by the Kaiserliche Marine. The two Type U 3 boats were ordered on 13 August 1907 from the Kaiserliche Werft Danzig. They had more powerfull engines than the previous U 2 and were far more reliable.^[2]

Design

Type U 3s had an overall length of 51.28 m (168 ft 3 in) The boats' beam was 5.60 m (18 ft 4 in), the draught was 3.05 m (10 ft 0 in). The boats displaced 421 tonnes (414 long tons) when surfaced and 510 t (500 long tons) when submerged.^[3]^[1]

Type U 3s were fitted with two Körting 8-cylinder two-stroke paraffin engines with a total of 600 metric horsepower (441 kW; 592 bhp) for use on the surface and two SSW double-acting electric motors with a total of 760 kW (1,033 PS; 1,019 shp) for underwater use. These engines powered two shafts, which gave the boats a top surface speed of 11.8 knots (21.9 km/h; 13.6 mph), and 9.4 knots (17.4 km/h; 10.8 mph) when submerged. Cruising range was 3,000 nautical miles (5,600 km; 3,500 mi) at 9 knots (17 km/h; 10 mph) on the surface and 50 nautical miles (93 km; 58 mi) at 4.5 knots (8.3 km/h; 5.2 mph) submerged.^[3]^[1] Constructional diving depth^[a] was 50 m (164 ft 1 in).^[4]

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 3 officers and 19 enlisted.^[3]^[1] Until the end of 1914, the Type U 3 U-boats could be equipped with a rotating Hotchkiss gun, and after 1915 U-3 was occasianally equipped with an extra 5 cm SK L/40 gun.^[5]^[3]

Ships


Name	launched^[6]	commissioned^[6]	ships sunk^[6]	Fate^[3]
U-3	27 March 1909	29 May 1909	none	Sunk on 1 December 1918 whilst under tow to scrapyard.
U-4	18 May 1909	1 July 1909	none	Scrapped in 1919

Footnotes

Notes

^ Constructional diving depth had a safety factor of 2.5, which meant that crushing depth was 2.5 times construction diving depth.^[4]

Citations

^ ^a ^b ^c ^d Gröner 1991, pp. 4–6.
^ Rössler 1981, p. 22.
^ ^a ^b ^c ^d ^e Möller & Brack 2004, p. 22.
^ ^a ^b Rössler 1981, p. 26.
^ Herzog 1993, p. 45.
^ ^a ^b ^c Herzog 1993, p. 67.

Bibliography

Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
Herzog, Bodo (1993). Deutsche U-Boote : 1906 - 1966 [German U-boats : 1906 - 1966] (in German). 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.

[5] Constructional diving depth had a safety factor of 2.5, which meant that crushing depth was 2.5 times construction diving depth.^[4]

[FOOTNOTEGröner19914–6-1] Gröner 1991, pp. 4–6.

[FOOTNOTERössler198122-2] Rössler 1981, p. 22.

[FOOTNOTEMöllerBrack200422-3] Möller & Brack 2004, p. 22.

[FOOTNOTERössler198126-4] Rössler 1981, p. 26.

[FOOTNOTEHerzog199345-6] Herzog 1993, p. 45.

[FOOTNOTEHerzog199367-7] Herzog 1993, p. 67.

[1]

[2]

[3]

[a]

[4]

[5]

[6]

v t e U-3-class submarines
U-3 U-4
Preceded by: U-1 class Followed by: U-5 class
List of Austro-Hungarian U-boats

v t e German naval ship classes of World War I
Dreadnought battleships	Nassau Helgoland Kaiser König Bayern L 20e α^X
Pre-dreadnought battleships	Brandenburg Kaiser Friedrich III Wittelsbach Braunschweig Deutschland
Battlecruisers	SMS Von der Tann^S Moltke SMS Seydlitz^S Derfflinger Mackensen^X Ersatz Yorck^X
Armored cruisers	SMS Fürst Bismarck^S SMS Prinz Heinrich^S Prinz Adalbert Roon Scharnhorst SMS Blücher^S
Light cruisers	SMS Hela^S Gazelle Bremen Königsberg Dresden Nautilus Kolberg Magdeburg Karlsruhe Graudenz Pillau Wiesbaden Königsberg Brummer Cöln FK proposals^X
Protected cruisers	SMS Kaiserin Augusta^S Victoria Louise
Large torpedo boats	1898 1906 1911 1913 1914 G101^A V105^N 1916 1916M 1917 1918^X
Small / Coastal torpedo boats	S7 A
Aircraft carriers	"I"^X
Coastal defense ships	Siegfried Odin
U-boats	U 1^S U 2^S U 3 U 5 U 9 U 13 U 16^S U 17 U 19 U 23 U 27 U 31 U 43 U 51 U 57 U 63 U 66 U 81 U 87 U 93 U 115^X U 127 U 131^X U 135 U 139 U 142 U 151 UA UB I UB II UB III UC I UC II UC III UD 1^X UE I UE II
S Single ship of class X Cancelled V Conversions A Building for Argentina when seized N Building for the Netherlands when seized See also: List of ships of the Imperial German Navy

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