NAVYPEDIA

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
U9		4	KW Danzig	1908	22.2.1910	4.1910	to United Kingdom 11.1918
U10		5	KW Danzig	1908	24.1.1911	8.1911	lost 27.5.1916
U11		6	KW Danzig	1908	2.4.1910	9.1910	sunk 9.12.1914
U12		7	KW Danzig	1908	6.5.1910	8.1911	sunk 10.3.1915

Technical data

Displacement standard, t
Displacement normal, t	493 / 611
Length, m	57.4
Breadth, m	6.00
Draught, m	3.13
No of shafts	2
Machinery	4 Körting petrol engines / 2 SSW electric motors
Power, h. p.	1000 / 1160
Max speed, kts	14.2 / 8.1
Fuel, t	petrol 52
Endurance, nm(kts)	1800(14) / 80(5)
Armament	1 x 1 - 7.9/79, 4 - 450 TT (2 bow, 2 stern, 6)
Complement	29
Diving depth operational, m	50

Project history

Medium coastal submarines. Double-hulled.

Modernizations

by late 1914, U9, 10, 12: - 1 x 1 - 7.9/79; + 1 x 5 - 37/27 RV L/30

1915, U9, 10: + 1 x 1 - 50/37 SK L/40 C/92

late 1915, U9: - 1 x 5 - 37/17

late 1915, U10: - 1 x 1 - 50/37, 1 x 5 - 37/17; + 1 x 1 - 88/42 TK L/45 C/14

3/1916, U9: - 1 x 1 - 50/37; + 12 mines

12/1916, U9: - 12 mines; + 1 x 1 - 50/37 SK L/40 C/92

Naval service

U10 was lost by unknown cause after 27.5.1916 in the Baltic Sea, probably mined. U11 was mined in English Channel 9.12.1914. U12 was rammed and sunk by explosive paravans of British destroyer Ariel  in the North Sea 10.3.1915.