SM U-91

History
German Empire
NameU-91
Ordered23 June 1915
BuilderKaiserliche Werft Danzig
Yard number35
Laid down1 August 1916
Launched14 April 1917
Commissioned17 September 1917
FateSurrendered to France 26 November 1918, Broken Up at Brest July 1921
General characteristics
Class & typeType U 87 submarine
Displacement
  • 757 t (745 long tons) surfaced
  • 998 t (982 long tons) submerged
Length
Beam
  • 6.20 m (20 ft 4 in) (oa)
  • 4.18 m (13 ft 9 in) (pressure hull)
Height9.35 m (30 ft 8 in)
Draught3.88 m (12 ft 9 in)
Installed power
  • 2 × 2,400 PS (1,765 kW; 2,367 shp) surfaced
  • 2 × 1,200 PS (883 kW; 1,184 shp) submerged
Propulsion2 shafts, 2 × 1.66 m (5 ft 5 in) propellers
Speed
  • 16.8 knots (31.1 km/h; 19.3 mph) surfaced
  • 9.1 knots (16.9 km/h; 10.5 mph) submerged
Range
  • 11,380 nmi (21,080 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph) surfaced
  • 56 nmi (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth50 m (160 ft)
Complement4 officers, 32 enlisted
Armament
Service record
Part of:
  • III Flotilla
  • 13 December 1917 – 11 November 1918
Commanders:
  • Kptlt. Alfred von Glasenapp
  • 17 September 1917 – 11 November 1918
Operations: 8 patrols
Victories:
  • 37 merchant ships sunk
    (83,302 GRT)
  • 2 merchant ships damaged
    (11,821 GRT)

SM U-91 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-91 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

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