Type U 3 submarine

Type U 3 was a class of U-boats built during World War I by the Kaiserliche Marine.

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 [1]
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 1 × 5 cm (2.0 in) SK L/40 gun (from 1915)

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.^[2][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.^[2][1] Constructional diving depth was 50 m (164 ft 1 in).^[3]

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.^[2][1]

Ships

Name	Fate[2]
U-3	Sunk on 1 December 1918 whilst under tow to scrapyard.
U-4	Scrapped in 1919