SMUB-28

For other ships with the same name, seeGerman submarine U-28.

SMUB-45,a U-boat similar toUB-28
History
German Empire
Name	UB-28
Ordered	30 April 1915
Builder	AG Weser,Bremen
Cost	1,291,000German Papiermark
Yard number	242
Laid down	12 July 1915
Launched	20 December 1915
Commissioned	27 December 1915
Fate	Surrendered 24 November 1918
General characteristics y
Class and type	Type UB II submarine
Displacement	265t(261long tons) surfaced 291 t (286 long tons) submerged
Length	36.13 m (118 ft 6 in)o/a 27.13 m (89 ft)pressure hull
Beam	4.36 m (14 ft 4 in) o/a 3.85 m (13 ft) pressure hull
Draught	3.66 m (12 ft)
Propulsion	1 ×propeller shaft 2 × 6-cylinderdiesel engine,270PS(200 kW; 270 bhp) 2 ×electric motor,280 PS (210 kW; 280 shp)
Speed	8.90knots(16.48 km/h; 10.24 mph) surfaced 5.72 knots (10.59 km/h; 6.58 mph) submerged
Range	7,200nmi(13,300 km; 8,300 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) submerged
Test depth	50 m (160 ft)
Complement	2 officers, 21 men
Armament	2 × 50 cm (19.7 in)torpedo tubes 4 ×torpedoes(later 6) 1 ×5 cm SK L/40 gun
Notes	30-second diving time
Service record
Commanders:	Oblt.z.S.Ernst Rosenow 27 December 1915 – 13 January 1916
Operations:	No patrols
Victories:	None

SMUB-28was a GermanType UB IIsubmarineorU-boatin theGerman Imperial Navy(German:Kaiserliche Marine) duringWorld War I.The U-boat was ordered on 30 April 1915 andlaunchedon 20 December 1915. She wascommissionedinto the German Imperial Navy on 27 December 1915 as SMUB-28.

UB-28was surrendered to Britain in accordance with the requirements of theArmistice with Germanyon 24 November 1918. She was ultimatelybroken upatBo'nessin 1919-20.

Design

AType UB II submarine,UB-28had a displacement of 265 tonnes (261 long tons) when at the surface and 291 tonnes (286 long tons) while submerged. She had a total length of 36.13 m (118 ft 6 in), abeamof 4.36 m (14 ft 4 in), and adraughtof 3.66 m (12 ft). The submarine was powered by twoBenzsix-cylinder diesel engines producing a total 267 metric horsepower (263 shp; 196 kW), twoSiemens-Schuckertelectric motors producing 280 metric horsepower (210 kW; 280 shp), and onepropeller shaft.She was capable of operating at depths of up to 50 metres (160 ft).

The submarine had a maximum surface speed of 8.9 knots (16.5 km/h; 10.2 mph) and a maximum submerged speed of 5.72 knots (10.59 km/h; 6.58 mph). When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 7,200 nautical miles (13,300 km; 8,300 mi) at 5 knots (9.3 km/h; 5.8 mph).UB-28was fitted with two 50 centimetres (20 in)torpedo tubes,four torpedoes, and one5 cm (2.0 in) SK L/40deck gun.She had acomplementof twenty-one crew members and two officers and a thirty-second dive time.

Bibliography

• Bendert, Harald (2000).Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal(in German).Hamburg:Verlag E.S. Mittler & Sohn GmbH.ISBN3-8132-0713-7.
• 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.ISBN0-85177-593-4.
• Rössler, Eberhard (1979).Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden(in German). Vol. I.Munich:Bernard & Graefe.ISBN3-7637-5213-7.