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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 4 – Section 3 |
| ARMY MORTARS |
| Type 97 - 81-mm High-Explosive Mortar |
| Weight complete round: 7.35 pounds. |
| Weight main charge: 1.19 pounds. |
| Explosive components: |
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Main charge: TNT. |
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Booster: Picric. |
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Propellant: |
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Nitrocellulose and graphite: 58.0 percent. |
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Nitroglycerine: 7.1 percent. |
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Dinitrotoluene: 25.7 percent. |
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Diphenylamine: 0.5 percent. |
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Potassium nitarte: 8.7 percent. |
| Over-all length (without fuze): 11.5 inches. |
| Length fin assembly: 3.19 inches. |
| Maximum diameter at bourrelet: 3.19 inches (81 mm). |
| Maximum diameter tail fins: 3.19 inches. |
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Color: Black over-all with a red tip. A yellow band is painted before the bourrelet. |
| Fuzing: Type 93 instantaneous short delay mortar fuze. |
| Weapons in which used: |
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Type 97 81-mm mortar. |
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Type 99 81-mm mortar. |
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Description: The body is of one-piece streamlined constrcution having a threaded open-ing in the nose to receive the fuze-adapter ring. A steel booster cup screws (L.H.) into the lower end of the adapter ring. The booster cup is closed by a shaped aluminum con-tainer which receives the gaine of the fuze. The bourrelet is well machined and has four grooves cut in it. |
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The fin assembly screws into a female threaded (R.H.) opening in the base of the body. It consists of a male plug welded to a cylindrical steel tube. Welded to this tube are six fins shaped to receive the six silk bags containing the propellant increments. Between each set of fins are three gas escape ports for the propellant gases from the cartridge which fits inside the tube. The cartridge is held in place by a countersunk ring screwed into the end of the tube. The cartridge resembles a shotgun shell. |
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Figure 303 – Type 91 81-mm High-Explosive Mortar. |
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