Several additional Japanese depth charge, believed to be in use, are described on the following pages. Since this information has been derived from intelligence sources it must be evaluated accordingly.

An anti-submarine weapon launched from surface craft. Since this charge has the same type number as the "Type 2, Modification 1", it may be a modification of that char-ge.

General characteristics of the charge are as follows:

Case

Shape and Size – Cylindrical, 17".56 in diameter, 30".5 long.

Material – Steel.

Charge – 220 lbs. Type 88 explosive.

Total Weight – 352 lbs.

External Fittings

Filling Holes – Two, 180° apart, on opposite end of the case from the pistol.

Pad Eyes – Two on each end.

Operation

No further information is available regarding its use as a depth charge. However, it has been adopted for use as a land mine on Iwo Jima.

An anti-submarine weapon launched from surface craft.

The physical characteristics of the charge are as follows:

Case

Shape – Cylindrical, 17".8 in diameter and 29"7 long.

Charge – 326 lbs. block-fitted Shimose explosive.

Total Weight – 523 lbs. (less accessories).

Operation

Nothing is known about the operation of this detph charge except that it sinks at the rate of 11.5 feet per second and it can be set to fire at either 25 or 45 meters (80' or 150') depth.

An anti-submarine weapon, launched from surface craft, designated by the Japanese as "Type 91, Model 1, Modification 1."

The physical characteristics of the charge are as follows:

Case

Shape – Cylindrical, 17".8 in diameter and 29".7 long.

Charge – 220 lbs. of Type 88 explosive with Shimose booster.

Total Weight – 352 lbs.

Operation

Nothing is known about the operation of this charge except that it sinks at the rate of 6.6 feet per second, and it can be set to fire at either 25 or 50 meters (80' or 165') depth.

An anti-submarine weapon launched from surface craft.

The physical characteristics are as follows:

Case

Shape – Cylindrical, 36" long.

Total Weight – 441 lbs.

Operation

The only depth setting given is 30 meters (100'). A parachute is used when launched from slow craft.

An anti-submarine weapon launched from surface craft. Only one type of this charge has been reported and this is designated by the Japanese as "Type 96, Model 1". This charge has characteristics similar to the "Type 95, Modification 2".

The physical characteristics of the charge are as follows:

Case

Shape and Size – Unknown.

Charge – 242 lbs. Type 88 or Type 1, Temporary explosive.

Total Weight – 374 lbs.

Operation

Nothing is known about the operation o the charge. When launched, it sinks at the rates of 6.6 feet per second or 3.3 feet per second when equipped with parachute for slow craft. The pistol has four depth settings, 30, 60, and 90 meters (100', 200' and 300') and 30 meters with parachute.

An anti-submarine weapon towed from surface craft.

The physical characteristics of the chare are as follows:

Case

Shape and Size – Unknown.

Charge – 55 lbs. Type 88 explosive.

Total Weight – 154 lbs.

Pistol – Modified Type 95.

Operation

Designed as a tactical anti-submarine weapon, this charge is towed  at depths from 131 to 164 feet. The towing cable is approximately 600 feet long and the speed of the towing ship is 24 knots.