A 24" torpedo powered by a four-cylinder reciprocating steam engine and fired from either cruisers or destroyers. One of the first Japanese long-range torpedoes, it leaves a visible wake and it is belived to be obsolete.

The physical characteristics of the torpedo are as follow:

Length Overall – Unknown (27'6" reported from intelligence sources).

Length of Warhead – Unknown (3'9" reported from intelligense sources).

Length of Airflask – 16'9".

Length of Afterbody – 6'11½". (Including Tail)

Diameter – 24".

Total Weight – 5800 lbs.

Charge – Unknown (880 lbs. Type 97 explosive reported from intelligence sources).

Tail Fins – 4.

Range/Speed – 10950 yards at 41 knots.

16400 yards at 32 knots.

21900 yards at 26 knots.

Depth Setting – 6'6 to 52'8.

Exploder – Belived to be Type 91, Model 1, nose, impact.

Operation

As the torpedo travels through the water, an impeller on the nose of the exploder ro-tates, arming the exploder. Impact with the target shears two pins in the exploder and drives the firing pin onto the detonator, firing the charge. Three bent-levers are atta-ched to the exploder to insure its operation in case the torpedo should strike the target at an oblique angle, rather than "head on".

Safety Precautions

Should this torpedo be found on the beach or in shallow water, it must be considered dangerous. Movement of one of the bent-levers, or the impeller might initiate detonation. Likewise, movement of the torpedo might cause the engine to turn over a few revolu-tions, driving it forward on the beach. Should the bent-levers or impeller strike anything, the torpedo would probably detonate.

Figure 31 – Type 8th year long range torpedo with warhead removed.