Several type of Japanese torpedos have been recovered and, whenever possible, their characteristics have been determined by running them on the torpedo testing range at Newport, R. I. Performance has been estimated on the torpedos which could not be ran-ged because of poor condition. In addition to the torpedos recovered, several other ty-pes have been reported from intelligence sources.

Japanese torpedos are designated by the year in which the torpedo was first run on a testing range. The "type" designation of a torpedo is not changed because of subse-quent modifications as long as the main engine and diameter of the torpedo remain the same. As the Japanese use several different systems for designating the year, the follo-wing list is only approximate:

Designation of Torpedo

First Trial

Type 44

Type 89

Type 90

Type 91

Type 93

Type 97

Type 2

1942

Explosive charges used with Japanese torpedos with the exception of Type 94, are the same as in mines and depth charges described on the preceding pages. The charac-teristics of this explosive are as follows:

Type 94 – Composed of Cyclonite 40%, and Trinitroanisole 60%. This explosive is used in a cast form and is rated as slightly more powerful than TNT.

JAPANESE TORPEDOS

Type

Used
on

Length

Diameter

Charge
Weight

Total
Weight

Source of
Information

Descriped
on Page

44 & 44, Model
2, Modif. 1

PT,
Picket
Boat

18'11"

17".7

460#

1830#

Recovered

36

6th Year Model

SS
CL, DD

22'5"

21"

451#

3200#

Recovered

37

8th Year Model

CL, DD

27'6"

24"

880#

5800#

Recovered
(less w. head)

38

89 & 89, Modif. 2

SS

23'8"

21"

660#

3660#

Intell. Repts.

39

89, Modif. 1

SS

23'6"

21"

600#

3660#

Recovered

39

90

DD, CA,
CL

27'10"

24"

880#

3520#

Intell. Repts.

47

91, Modif. 1

A/C, PT

17'3"

17".7

338#

1730#

Recovered

40

91, Modif. 2

A/C, PT

18'

17".7

420#

1800#

Recovered

41

91, Modif. 3

A/C, PT

17'4"

17".7

522#

1800#

Recovered

42

91, Modif. 3
with Modif. 6
warhead

A/C, PT

18'9"

17".7

812#

2100#

Recovered

42

91, Modif. 3
with Type 3
warhead

A/C

18'

17".7

493#

1800#

Recovered

42

92

SS

23'8"

21"

660#

3369#

Intell. Repts.

47

93, Model 1
Modif. 2

DD, CA,
CL

29'6"

24"

1080#

6000 -
6500#

Recovered

44

94, Modif. 1

A/C

22'

17".7

867#

3245#

Intell. Repts.

47

94, Modif. 2

A/C

17'4"

17".7

462#

1823#

Intell. Repts.

47

95

SS

23'8"

21"

880#

3520#

Intell. Repts.

48

New Kure

A/C

Un-
known

17".7

660#

1870#

Intell. Repts.

48

2 (Special)

A/C, PT

18'3.2"

17".7

650#

1800#

Recovered

46

97

Midget
Submarines

18'5"

17".7

790#

2205#

Recovered

45