This model torpedo has eight tail fins rather than four, and is equipped with anti-roll flippers on either side of the afterbody. The warhead and afterbody are of welded in-stead of riveted construction. It has a single speed and leaves a visible wake.

The physical characteristics of the torpedo are as follows:

Length Overall – 18'.

Length of Warhead – 3'10".

Length of Airflask – 8'11".5.

Length of Afterbody – 5'2".5 (Including Tail).

Diameter – 17".7.

Total Weight – 1840 lbs.

Charge – 420 lbs. Shimose, Type 94 or 97 explosive.

Tail Fins – 8.

Range/Speed – 3300 yards at 42 knots.

Depth Setting – 6'6 to 52'8.

Warhead – Type 91, Modification 2.

Exploder – Type 90, Model 2, bail, impact-inertia in pocket on top centerline of war-head.

Operation

This torpedo operates in the same manner as Type 91, Modification 1, described on the preceding pages. It has been replaced in service the Type 91, Modification 3, and Type 2.

Safety Precautions

Same as Type 91, Modification 1.

Figure 34 – Type 91 Modification 2 torpedo with warhead removed.
Note the 8 tails fins and the pivot point for the anti-roll flipper.
This flipper has been removed from the torpedo.