fighting ships of the world



U3 submarines (1909)

U3 1915

Name Yard No Builder Laid down Launched Comp Fate
U3 135 Germaniawerft, Kiel, Germany 3/1907 20/8/1908 9/1909 sunk 13/8/1915
U4 136 Germaniawerft, Kiel, Germany 3/1907 20/11/1908 8/1909 to France 1920


Displacement normal, t

240 / 300

Displacement full, t


Length, m

42.3 wl 43.2 oa

Breadth, m


Draught, m


No of shafts



Körting kerosene engines / electric motors

Power, h. p.

600 / 340

Max speed, kts

12 / 8.5

Fuel, t


Endurance, nm(kts)

1200(6) / 45(3)


2 - 450 TT (bow, 3)


Diving depth operational, m 30

Ship project history: Built by Germaniawerft at Kiel and towed to Pola via Gibraltar, they were of a double-hull type with internal saddle tanks. Although the German designers had evaluated the best hull-shaped in extensive model trials, these boats had constant troubles with their diving planes. The fins were changed in size and shape, and finally the bow planes were removed and a fixed stern flap was installed. Because of their greater displacement these boats had better seakeeping qualities and living conditions than their competitors. Considering that this was one of the first Germaniawerft designs, produced without extensive practical experience, these boats showed a high degree of effectiveness, and U4 had the longest operational history of all Austrian submarines.

Modernizations: 4/1915, U4: + 1 x 1 - 37/20 SFK L/23 H

1917, U4: - 1 x 1 - 37/20; + 1 x 1 - 66/24 G. L/26 K.15 BAK

Naval service: Both saw action during the war. U3 made an unsuccessful attack on the Italian armed merchant cruiser Città di Catania, was rammed and damaged, and when surfacing was hit by the French destroyer Bisson and sunk 13/8/1915. U4 was ceded as a war reparation to France and scrapped in 1920.

U4 1909

Ivan Gogin, 2014