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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 1 – Section 1 |
| Japanese Army Bombs |
| Type 92 250-kg. and 500-kg. High-Explosive Bombs |
| Fuzes: A-4 (a); B-4 (a). |
| 250 kg. | 500 kg. | |
| Over-all length | 76 inches. | 99 3/4 inches. |
| Length of body | 46 inches. | 57 1/2 inches. |
| Diameter of body | 11 3/4 inches. | 15 inches. |
| Thickness of wall | 1/4 inch. | 9/16 inch. |
| Material of wall: Tubular steel. |
| Type of suspension: Horizontal. |
| Suspension lug: Normal Army type. |
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Color and markings: Black over-all with a red tipped nose and one yellow and one white band forward of suspension lug. |
| 250 kg. | 500 kg. | |
| Length of tail | 30 inches. | 43 1/4 inches. |
| Width of tail | 16 1/2 inches. | 20 3/4 inches. |
| Width of tail fins | 8 1/4 inches. | 10 3/8 inches. |
| Dimension of tail struts: Length 11 inches; width, 7/8 inches; thickness 1/16 inch. |
| Material of tail: Steel. |
| Type of filling: Preformed blocks of picric acid. |
| 250 kg. | 500 kg. | |
| Weight of filling | 230 pounds. | 491 pounds. |
| Total weight of bomb | 550 pounds. | 1,100 pounds. |
| Charge/weight ratio | 43 percent. | 46.4 percent. |
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Construction of body: A cast-steel nosepiece is threaded into a tubular-steel body. A tail cone is welded to the after end of the body. |
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Construction of tail: Four fins are welded to the tail cone and braced by two sets of box type struts. The tail fins of the 500 kg. are similar to the Navy bombs in that they are angled on the outer edge, as compared to the characteristic curve on the fins of Army 30-kg. to 250-kg. high-explosive bombs. |
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Figure 7 - Type 92 250-kg. and 500-kg. High-Explosive Bombs |
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