Several additional types of Japanese torpedoes are believed to be in service. The da-ta on characteristics and description of these torpedoes, taken from intelligence reports, are given on the following pages.

A 24" torpedo powered by a two-cylinder double-acting reciprocating steam engine and designed for use by destroyers and cruisers. This torpedo has largely been replaced by the Type 93.

General characteristics of the torpedo are as follows:

Length Overall – 27'10".

Length of Warhead – 3'10".

Length of Airflask – 13'1".

Length of Afterbody – 10'11" (Including Tail).

Diameter – 24".

Total Weight – 3520 lbs.

Range/Speed – 8752 yards at 45 knots.

10940 yards at 42 knots.

16410 yards at 32 knots.

Charge – 880 lbs. Type 94 or Shimose explosive.

Depth Setting – 7' to 59'.

Exploder – Type 90, bail impact-inertia, in pocket on top centerline of warhead.

Operation

As the torpedo travels through the water, pressure depresses the bail, unlocking the inertia-trigger, and rotates the impeller. This arms the exploder, and impact with the tar-get displaces the inertia trigger and releses the fring pin. Under spring pressure, the firing is driven downward onto the detonator, firing the charge.

Safety Precautions

This torpedo must be considered dangerous if found on the beach. Neither the explo-der, nor the torpedo itself should be moved, as movement may initiate detonation.

A 21" torpedo powered by an electric motor and designed for use by submarines. This torpedo is reported as trackless, firing on either impact or magnetic actuation. It is be-lieved to be patterned after a German electric torpedo.

The physical characteristics of the torpedo are as follows:

Length Overall – 23'8".

Diameter – 21".

Total Weight – 3369 lbs.

Charge – 660 lbs. Type 97 explosive.

Range/Speed – 5400 yards at 30 knots (When batteries are pre-warmed).

3300 yards at 28 knots (When batteries are not prewarmed).

Exploder – Impact or magnetic.

Operation

Nothing is known about the operation of this torpedo. It is reported as producing a distinctly whining noise at short distances.

Safety Precautions

This torpedo must be presumed dangerous if found in shallow water or on the beach.

Two models of this 17".7 aircraft torpedo, designated by the Japanese as Type 94, Modification 1 and Type 94, Modification 2, have been reported.

General characteristics of the torpedoes are as follows:

Length Overall – Type 94, Modification 1 - 22'.

Type 94, Modification 2 - 17'4".

Length of Warhead – Type 94, Modification 2 - 5'

Diameter – 17".7.

Total Weight – Type 94, Modification 1 - 3245 lbs.

Type 94, Modification 2 - 1823 lbs.

Range/Speed – Type 94, Modification 1 - 4923 yards at 45 knots.

Type 94, Modification 2 - 3300 yards at 42 knots.

Operation

Nothing is known about the operation of these torpedoes. Type 94, Modification 1, is reported to have an air speed release of 445 knots at an altitude of 85 feet.

A 21" torpedo powered by a two-cylinder double-acting reciprocating steam engine and fired from submarines. The use of oxygen in place of compressed air leaves a slightly visible wake.

Physical characteristics of the torpedo are as follows:

Length Overall – 23'8".

Diameter – 21".

Total Weight – 3520 lbs.

Charge – 880 lbs. of Type 97 explosive.

Range/Speed – 4900 yards at 30 knots.

7100 yards at 28 knots.

Operation

Nothing is known about the operation of this torpedo.

Very little is known about this 17".7 aircraft torpedo. It is reported as weighing 1870 lbs. and carrying a charge of 600 lbs. of Type 97 explosive. The range is 1600 yards at 42 knots, and the air speed release is 190 knots at an altitude of 160 feet.

Information has been received on two additional torpedoes from intelligence sources which it is believed worthwhile to print here. The first of these is fired from PT boats which has a gyro-control capale of steering the torpedo on a zigzag course at angles of 45°.

The second torpedo is fired from land based tubes and has a range of 7200 yards at 60 knots. There are two types of this torpedo, one 13' long and the other 11'4" long. The diameter for both is reported as 14" - 15".