SM UB-3
UB-3 was similar in appearance to her sister boat SM UB-4, pictured here in 1915.
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| History | |
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 German Empire
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| Name: | UB-3 |
| Ordered: | 15 November 1914 |
| Builder: | Germaniawerft, Kiel |
| Yard number: | 241 |
| Laid down: | 3 November 1914 |
| Launched: | 5 March 1915 |
| Commissioned: | 14 March 1915 |
| Fate: | disappeared after 23 May 1915 |
| General characteristics | |
| Class and type: | Type UB I submarine |
| Displacement: | 127 t (125 long tons) surfaced 142 t (140 long tons) submerged |
| Length: | 28.10 m (92.2 ft) (o/a) |
| Beam: | 10 ft 6 in (3.20 m) |
| Draft: | 9 ft 10 in (3.00 m) |
| Propulsion: | 1 × propeller shaft 1 × Daimler 4-cylinder diesel engine, 59 bhp (44 kW) 1 × Siemens-Schuckert electric motor, 119 shp (89 kW) |
| Speed: | 6.47 knots (11.98 km/h; 7.45 mph) surfaced 5.51 knots (10.20 km/h; 6.34 mph) submerged |
| Range: | 1,650 nmi (3,060 km; 1,900 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) |
| Test depth: | 50 metres (160 ft) |
| Complement: | 14 |
| Armament: | 2 × 45 cm (17.7 in) bow torpedo tubes 2 × torpedoes 1 × 8 mm (0.31 in) machine gun |
| Notes: | 33-second diving time |
| Service record | |
| Part of: | Pola Flotilla 1 May 1915 – 23 May 1915 |
| Commanders: | Oblt.z.S. Siegfried Schmidt 24 March – 23 May 1915 |
| Operations: | 1 patrol |
| Victories: | None |
SM UB-3 was a German Type UB I submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She disappeared on her first patrol in May 1915, and was the first of her class to be lost.
UB-3 was ordered in October 1914 and was laid down at the Germaniawerft shipyard in Kiel in November. UB-3 was a little more than 28 metres (92 ft) in length and displaced between 127 and 142 metric tons (125 and 140 long tons), depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. She was launched and commissioned as SM UB-3 in March 1915.
UB-3 was broken into sections and shipped by rail to the Austro-Hungarian port of Pola in April for reassembly. She officially joined the Pola Flotilla on 1 May and departed on her first patrol for temporary duty in Turkey on 23 May, and was never seen again. A postwar German study concluded that UB-3 was likely the victim of an unexplained technical problem in the absence of any minefields or enemy action.
After the German Army's rapid advance along the North Sea coast in the earliest stages of World War I, the German Imperial Navy found itself without suitable submarines that could be operated in the narrow and shallow environment off Flanders. Project 34, a design effort begun in mid-August 1914, produced the Type UB I design: a small submarine that could be shipped by rail to a port of operations and quickly assembled. Constrained by railroad size limitations, the UB I design called for a boat about 28 metres (92 ft) long and displacing about 125 metric tons (123 long tons) with two torpedo tubes.UB-3 was part of the initial allotment of eight submarines—numbered UB-1 to UB-8—ordered on 15 October from Germaniawerft of Kiel, just shy of two months after planning for the class began.
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