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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 3 No. 25 Mk 8 Bomb Model 1 |
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Fuzes: A-3 (a). |
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Over-all length: 67 inches. |
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Length of body: 39 5/8 inches. |
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Diameter of body: 12 inches. |
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Thickness of wall: 1/2 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 suspension lug. |
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Color and markings: Green band around the nose, brown band aft of green band. Gray body and tail. |
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Length of tail: 27 3/8 inches. |
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Width of tail: 19 5/8 inches. |
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Width of tail fins: 6 3/8 inches. |
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Dimensions of tail struts: None. |
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Material of tail: Sheet steel. |
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Type of filling: Type 97 explosive. |
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Weight of filling: 263 pounds. |
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Total weight of bomb: 649 pounds. |
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Charge/weight ratio: 40 percent. |
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Construction of body: A cast-steel nose is attached to a tubular-steel body by a conti-nuous circumferential weld and 12 plug welds. A tail cone is held to a collar by 18 plug welds. The collars fits into the after end of the body and is held there by 40 screws. |
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Construction of tail: The normal tail cone has been cut off 8 3/4 inches aft of the junc-tion with the bomb body proper and to this has been welded a 3/16 inch steel cylinder and four 1/8 inch steel hollow tail fins. |
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Tail cylinder: |
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Outside diameter: 5 5/8 inches. |
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Length: 18 5/8 inches. |
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Type of filling: Type 97 explosive. |
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Tail fins: |
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Shape of cross-section: Triangular. |
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Over-all length: 25 1/2 inches. |
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Height: 6 3/8 inches. |
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Width at base: 2 1/2 inches. |
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Reinforcement of fins: |
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A box strut made of 1/8-inch mild steel runs the length of the fin on the inside. The box strut is 7/8-inch wide at the top and 1 1/2-inches wide at the bottom, 1 3/4 inches high and 22 inches long. The strut is welded along the two lower edges to the side of the fins proper and spot welded along the sides. |
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| 2. |
Three 1/4-inch mild steel braces, 1 1/2 inches wide at the top, 2 1/2 inches wide at the bottom and 2 inches high are welded at 5 1/2-inch intervals to the box strut and the sides of the fins. The lower sides of these braces have been shaped to fit the cylinder. |
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| 3. |
The end of the fins is closed by a 1/8-inch steel plate welded in place. |
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Figure 59 - Type 3 No. 25 Mk 8 Bomb Model 1. |
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