U Specs

7. Selected Technical Data of Imperial German U-boats and their Torpedoes

Type Displace-
ment
m³ Diving
Depth*
[m] Propulsion
[hp] max. Speed
[kn] Range
[nm/kn] Armament Crew**

SM U-9
(equal to SM
U 10 to U 12) 493 sf
  611 sm 50 2x300 hp PM +
2x225 hp PM***
2x580 hp EM 14,2 sf
    8,1 sm 3,250/9 sf
75/5 sm 2 BT, 2 ST
6 torpedoes 4 - 25

SM U 17
(equal to
SM U 18) 564 sf
  691 sm 50 4x350 hp PM***
2x560 hp EM 14,9 sf
    9,5 sm 6,700/8 sf
75/5 sm 2 BT, 2 ST
6 torpedoes 4 - 25

SM U 21
(equal to SM
U 19 to U 22) 650 sf
  837 sm 50 2x850 hp DM
2x600 hp EM 15,4 sf
    9,5 sm 7,600/8 sf
80/5 sm 2 BT, 2 ST
6 torpedoes
1 x 8.8 cm UK 4 - 31

SM U-53
(equal to SM
U-51 to U-56) 715 sf
  902 sm 50 2x1,200 hp DM
2x600 hp EM 17.1 sf
    9.1 sm 9,400/8 sf
55/5 sm 2 BT, 2 ST
8 torpedoes
2 x 8.8 cm UK 4 - 31

SM U 117
(equal to SM
U 118 to U 121)
Type UE II 1,164 sf
  1,512 sm 75 2x1,200 hp DM
2x600 hp EM 14.7 sf
    7.0 sm 13,900/8 sf
35/4,5 sm 4 BT
12 torpedoes
42 UC200 mines
(+ 32 storage) 4 - 36

SM U 135
(equal to SM
U 136 to U 138)
Type 42 1,175 sf
  1,531 sm 75 2x1,750 hp DM
2x450 hp DG
2x845 hp EM 17.7 sf
    8.1 sm 10,000/8 sf
50/4,5 sm 4 BT, 2 ST
14 torpedoes
2 x 10,5 cm UK 4 - 42

SM U 139
(equal to SM
U 140 to U 141)
Type U-cruiser 46 1,930 sf
  2,483 sm 75 2x1,750 hp DM
2x450 hp DG
2x845 hp EM 15.8 sf
    7.6 sm 12,630/8 sf
53/4,5 sm 4 BT, 2 ST
19 torpedoes
2 x 15.0 cm UK 6 - 56
(+ 1/20
prize-
crew)

SM U 151
(equal to SM
U 152 to U 157)
former merchant U-boat 1,512 sf
  1,875 sm 50 2x400 hp DM
2x400 hp EM 12.4 sf
    5.2 sm 25,000/5.5 sf
65/3 sm 2 BT
18 torpedoes
2 x 15.0 cm
2 x 10,5 UK 6 - 50
(+ 1/20
prize-
crew)

SM UB 13
(equal to SM
UB 9 to UB 17)
Type UB I 127 sf
  141 sm 50 1x60 hp DM
1x120 hp EM 6.5 sf
    5.5 sm 1,650/5 sf
45/4 sm 2 BT
2 torpedoes
1 MG 1 - 13

SM UB 29
(equal to SM
UB 24 to UB 28)
Type UB II 263 sf
  292 sm 50 2x142 hp DM
2x140 hp EM 9.2 sf
    5.8 sm 6,500/5 sf
45/4 sm 2 BT
4 torpedoes
1 x 5.0 cm UK 2 - 21

SM UB 116
(equal to SM
UB 103 to UB 117)
Type UB III 516 sf
  651 sm 50 2x550 hp DM
2x394 hp EM 13.6 sf
    8.0 sm 8,500/6 sf
55/4 sm 4 BT,1 ST
10 torpedoes
1 x 8,8 cm UK 3 - 31

SM UC 1
(equal to SM
UC 2 to UC 10)
Type UC I 168 sf
  183 sm 50 1x90 hp DM
1x175 hp EM 6.2 sf
    5.2 sm 750/5 sf
50/4 sm 12 UC 120 mines 1 - 13

SM UC 71
(equal to SM
UC 65 to UC 73)
Type UC II 417 sf
  493 sm 50 2x350 hp DM
2x230 hp EM 11.6 sf
    7.0 sm 9,430/7 sf
55/4 sm 2 BT, 1 ST
7 torpedoes
1 x 10,5 cm UK
18 UC 200 mines 3 - 23

SM UC 80
(equal to SM
UC 81 to UC 86)
Type UC III 474 sf
  560 sm 50 2x300 hp DM
2x385 hp EM 11.5 sf
    6.6 sm 8,400/7 sf
40/4,5 sm 2 BT, 1 ST
7 torpedoes
1 x 10,5 cm UK
18 UC 200 mines 3 - 29

*  All German U-boats were engineered with a diving depth safety factor of 2.5. That means that at a conctructed diving depth (Konstruktionstauchtiefe) of 50 m, the probale destruction depth of the pressure hull was about 125m.
** First number shows the officers, the second the senior and junior rates.
*** Körting petrol motor
Acronyms:
PM = "Petrolmotor", Petrol Engine; DM = "Dieselmotor", Diesel Engine; DG = Diesel Generator
EM = Electric Motor;
BT = Bow Torpedo Tube; ST = Stern Torpedo Tube; UK = "Unterseebootskanone", U-boat Deck Gun;
sf = surfaced; sm = submerged

Selected Technical Data of U-boat Torpedoes used by the Imperial Navy

Torpedo
Type Diameter
[cm] Length
[m] Propulsion
[hp] Range/Speed
[m/kn] Warhead [kg] In use in
U-boats since

C06 AV 45 5.65 Alcohol generated
steam 3,600/27 122 1914

C06 D 45 5.65 Petrol generated steam
with seawater injection 5,900/27 122 1914

G6 AV 50 60 Alcohol generated steam
with sweetwater injection 5,000/27 160 1914

G6 D 50 6.0 Petrol generated steam
with sweetwater injection 8,400/27 164 1914

G7 50 7.02 Petrol generated steam
with sweetwater injection 9,800/27 195 1918

The 45 cm torpedoes were used only by the U-boats SM U 1 to U 18, SM U-66 to U-70, SM UB 1 to UB 17.
All torpedoes were equipped with a device allowing the torpedo to be shot at an angle to the Target of up ± 90°.

The U-boat War in World War One