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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 2 |
| NAVY ROCKETS |
| 20-cm (8-Inch) High-Explosive Spin-Stabilized Rocket |
| Assembled round: |
| Weight of complete round (with fuze): 199.95 pounds (90.7 kg.). |
| Length of complete round (without fuze): 40.28 inches. |
| Head: |
| Weight of filled head (without fuze): 110.01 pounds (49.9 kg.). |
| Weight empty (body): 57.32 pounds. |
| Length of head (without fuze): 23.15 inches. |
| Diameter of head: 17.99 inches (203.0 mm). |
| Filling: Cast type 91 explosive (trinitroanisole): 38.58 pounds (17.5 kg.). |
| Fuzing: Type 4 rocket fuze: 1.76 pounds. |
| Motor: |
| Weight of filled motor: 88.18 pounds (40.0 kg.). |
| Weight empty (body): 43.21 pounds. |
| Length of motor: 17.21 inches. |
| Diameter at bearing surfaces: 7.99 inches (203.0 mm). |
| Six nozzles are offset at 25° from the longitundinal axis of the motor. |
| Propellant: |
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7 grains (11.42- by 2.28- by 0.43-inches perforation) of double-base smokeless powder, weighing a total of 18.30 pounds (8.3 kg.); code designation, 240 Special DT2. Docu-ments state that 240 DT6 may also be used. |
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Ignition mechanism: |
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Igniter: Percussion primer. |
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Ignition charge (black powder in silk pad): 50.6 grams. |
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Color and markings: |
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Maroon over all, with the nose tipped with a 2.13-inch green band. A 0.35- inch yellow band appears at the junction of the motor and projectile. Labels are located on the body (date unknown), in the nose fuze pocket (bearing explosive data), and on the forward end of the motor base plate (bearing propellant data). A serial number is stamped on the motor base. |
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Launcher: |
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Three signal-round launchers have been designed for this round. Two of these are trough-type, while the third is a barrel-type launcher. In addition a triple-mount trough-type launcher has been recovered. |
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Remarks: The head of this rocket consists of a slightly modified 20-cm projectile. |
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The rotating band is removed, and the round may be found with ot without rotating band groove, depending on the method of conversion. |
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Figure 424 – 20-cm High-Explosive Spin-Stabilized Rocket. |
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