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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 1 |
| NAVY PROJECTILES |
| 15.5-cm (155-mm) (6.1-Inch) Illuminating |
| Weight of filled projectile (without fuze): No data. |
| Weight of empty projectile: 111.19 pounds. |
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Weight stamped on rotating band: 111.19 pounds (varies with individual projectiles). |
| Length of projectile (without fuze): 25.29 inches. |
| Diameter at bourrelet: 6.08 inches (154.5 mm). |
| Distance from base to rotating band: 2.36 inches. |
| Width of rotating band: |
| Forward: 1.26 inches. |
| Space: No data. |
| Aft: 1.26 inches. |
| Radius of ogive: No data. |
| Filling: |
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A flash charge, an ejection charge (80 grams) and a thin layer of igniting composition are black powder. |
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The illuminating element is presumed to be the typical Japanese illuminant consisting of a mixture of barium nitrate, magnesium, and wax. |
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Fuzing: Type 91 mechanical time fuze. |
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Weapon in which used: 15.5-cm gun (bag). |
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Operation: The functioning of the projectile is as follows: |
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1. The time fuze functions, igniting the flash charge. |
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2. The flash charge, in turn, ignites the ejection charge, which expels from the base of the projectile the upper and lower split canisters containing, respectively, the illuminating charge and the supporting parachute. |
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3. Simulatneously the ejection charge ignites the illuminating charge. The burning time is 45 seconds. |
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Figure 415 – 15.5-cm Illuminating. |
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