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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 2 |
| NAVY ROCKETS |
| 12-cm Incendiary-Shrapnel Spin-Stabilized Rocket |
| Assembled round: |
| Weight of complete round: 51 pounds (23.18 kg.). |
| Length of complete round: 28 9/16 inches. |
| Head: |
| Weight of filled head: 17 pounds 9 ounces. |
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Weight of filling: Picric burster charge, 4 3/4 ounces; incendiary cylinder filled, 10 pounds 11 3/4 ounces. |
| Length of head: 10 inches. |
| Length of incendiary cylinder: 7 7/16 inches. |
| Diameter of head: 4.7 inches (12 cm). |
| Filling: |
| Picric acid burster charge: 4 3/4 ounces. |
| Incendiary cylinder (W.P. pellets): 10 pounds 11 3/4 ounces. |
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Fuzing: Simple powder delay fuze: Powder delay train type ignited by flash from primer in base of motor. |
| Motor: |
| Weight of filled motor: 13 pounds 11 ounces. |
| Weight of propellant: 7 pounds 5 ounces (3.3 kg.). |
| Length of motor: 17 5/16 inches. |
| Diameter: 4.7 inches (12 cm). |
| Six nozzle are offset 21° to the longitudinal axis of the rocket. |
| Warhead–motor adapter: |
| Weight: 3 pounds 6 3/4 ounces. |
| Length: 2 13/16 inches. |
| Diameter: 4.7 inches (12 cm). |
| Propellant: |
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6 long and 1 short grains of 150 special DT6 (60 percent nitrocellulose, 29.3 percent ni-tro-glycerine, 2.85 percent ethyl centralite and 6.14 percent mononitro-naphthalene) |
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Long grains are 14 inches by 1.345 inches (34 mm) single perforation 3/16 inches in dia-meter. The short grain is identical to the long grains, but shorter (10 1/2 inches). |
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Ignition mechanism: |
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Igniter: Percussion primer. |
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Ignition charge: 1 ounce black powder in silk bag. |
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Color and markings: |
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Black over all. Three and one-half inches aft of nose piece is a 1/2 inch yellow band. A second 1/2 inch yellow band is located aft of the flange on the base plate. A label, car-rying propellant data, is fixed in the motor. |
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Launcher: |
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The rocket is launched from a wooden through mounted one on each side of the cockpit of the Jap suicide boat. |
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Remarks: The powder delay train type fuze used in the 12-cm. rocket allows the rocket to travel about 2,000 to 3,000 yards before the main charge is detonated. |
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Figure 423 – 12-cm Incendiary Shrapnel Spin-Stabilized Rocket. |
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