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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 1 – Section 2 |
| Japanese Navy Bombs |
| Type 1 No. 7 Mk 6 Bomb Model 3 Modification 1 |
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Fuzes: A-3 (a). |
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Over-all length: 42 1/4 inches. |
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Length of body: 21 inches. |
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Diameter of body: 9 3/8 inches. |
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Thickness of wall: 1/8 inch. |
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Material of wall: Steel. |
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Type of suspension: Horizontal. |
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Suspension lug: Normal Navy type suspension lug. |
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Color and markings: Gray over all with a 3 1/2-inch red band at the nose and red tail struts. New type markings will befound. |
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Length of tail: 21 inches. |
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Width of tail: 13 1/4 inches. |
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Width of tail fins: 6 inches. |
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Dimensions of tail struts: Length, 9 1/2 inches; width, 1 3/8 inches; thickness, 1/16 inch. |
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Material of tail: Sheet steel. |
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Type of filling: 182 cylindrical incendiary pellets are arranged around a central cardboard tube. The pellets are bound together with string to form rings. The rings surround the central tube which is filled with gray powder. All the space in the bomb not occupied by the pellets is filled with this powder. |
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Weight of individual pellets: 7 ounces. |
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Total weight of pellets: 81 pounds. |
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Length of pellets: 2 1/8 inches. |
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Diameter of pellets: 1 1/2 inches. |
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Composition of pellets: |
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35 percent barium nitrate. |
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28 percent ferric oxide. |
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18 percent aluminum. |
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Remainder is synthetic rubber of ploy-sulphide type resembling "thiokol." |
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Weight of iginter powder, 30 pounds. |
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Composition of igniter powder: |
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75 percent barium nitrate. |
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24.5 percent aluminum. |
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0.3 percent oil. |
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0.2 percent moisture. |
| Weight of filling: 111 pounds. |
| Total weight of bomb: 160 pounds. |
| Charge/weight ratio: 69.4 percent. |
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Construction of body: A cast-steel nosepiece is attached to a longitudinally welded steel body by a continuous circumferential weld. The nose contains a wooden block 1 3/4 inches thick to which a light metal gaine well is secured by three nails. A longitudi-nally welded tail cone is welded to a collar which fits into the after end of the body and is held there by a single row of 16 screws. |
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Construction of tail: Four steel fins are spot welded to the tail cone. They are braced by a single set of box-type struts. |
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Remarks: Type 1 No. 7 Mk 6 Model 3: This bomb uses the same case as that described above but differs in the filling. It contains a high explosive burster charge in a central tube and an explosive filling of approximately 520 wedge-shaped rubber pellets impregna-ted with iron and aluminum. |
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Figure 58 - Type 1 No. 7 Mk 6 Bomb Model 3 Modification 1. |
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