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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 |
| No. 25 Land Bomb and Type 98 No. 25 Land Bomb |
| Fuzes: A-3 (a), A-3 (b), C-2 (a), B-3 (a), C-1 (a). |
| No. 25 | Type 98 No. 25 | |
| Over-all length | 72 inches. | 72 inches. |
| Length of body | 35 1/2 inches. | 39 1/2 inches. |
| Diameter of body | 13 3/4 inches. | 12 inches. |
| Thickness of wall | 1/4 inch. | 1/2 inch. |
| Material of wall: Steel. |
| Type of suspension: Horizontal. |
| Suspension lug: Normal Navy suspension lug. |
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Color and markings: Gray over all with a green nose band and green tail struts. There are two thin, red lines 180° apart along the length of the bomb. New type color markings will be found. |
| No. 25 | Type 98 No. 25 | |
| Length of tail | 36 1/2 inches. | 32 1/2 inches. |
| Width of tail | 19 5/16 inches. | 16 5/8 inches. |
| Width of tail fins | 7 5/8 inches. | 7 5/16 inches. |
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Dimensions of tail struts: Length, 13 7/8 inches; width 2 1/4 inches, thickness, 3/32 inch. |
| Material of tail: Sheet steel. |
| No. 25 | Type 98 No. 25 | |
| Type of filling | Type 98 explosive. | Picric acid or type 98 explosive. |
| Weight of filling | 330 pound. | 211 pound. |
| Total weight of bomb | 550 pound. | 532 pound. |
| Charge/weight ratio | 60 percent. | 40 percent. |
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Construction of body: No. 25 Land: A cast-steel nose is welded to a tubular-steel body by a continuous weld and a row of 16 plug welds. The tail cone is held by 1 row of 32 screws to a collar which is held in the base of the bomb by a row of 16 plug welds. There is a threaded fuze pocket in both the nose and tail. |
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Type 98 No. 25 Land: A cast-steel nose is welded to a tubular-steel body by a continu-ous weld and 1 row of 12 large plug welds. The tail cone is held by 1 row of 18 plug welds and a continuous weld to collar which is held in the base of the bomb by 40 screws in 2 rows of 20 each. There is a threaded fuze pocket in both the nose and tail. |
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Construction of tail: Four fins are spot-welded to the tail cone and braced by a single set of box-type struts. |
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Remarks: The type 98 bomb is reported in some instances to be turned down to appear smooth on the exterior surface. |
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Figure 37 - No. 25 Land Bomb and Type 98 No. 25 Land Bomb |
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