No. 25 Land Bomb and Type 98 No. 25 Land BombType 99 No. 6 Ordinary Bomb
Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices
and Sabotage Devices
Chapter 1 – Section 2
Japanese Navy Bombs
No. 80 Land Bomb

Fuzes: A-1 (c), B-3 (b), A-3 (d).

Over-all length: 113 inches.

Length of body: 72 inches.

Diameter of body: 18 inches.

Thickness of wall: 1/2 inch.

Material of wall: Steel.

Type of suspension: Horizontal.

Suspension lug: Two guide studs on the bomb body position a carrying band to which a suspension lug is attached.

Color and markings: Grey over-all. Green nose and tail struts. Two red lines 180° apart long the longitudinal axis of the bomb. Blue band around the body. New type markings will be found.

Length of tail: 41 inches.

Width of tail: 25 inches.

Width of tail fins: 10 1/2 inches.

Dimensions of tail struts: Length, 17 1/4 inches; width, 3 5/8 inches; thickness, 1/8 inch.

Material of tail: Steel.

Type of filling: Picric acid (tail cone is filled), or type 98 explosive.

Weight of filling: 842 pounds.

Total weight of bomb: 1,760 pounds.

Charge/weight ratio: 48 percent.

Construction of body: A cast-steel nose is attached to a tubular body by a continuous circumferential weld and 3 rows of 14 rivets each. The tail cone is held by a continuous circumferential weld and 2 rows of 16 rivets each to a collar which is held in the base of the bomb by 2 rows of round-headed screws (32 screws in each row). This bomb has a threaded fuze pocket in both the nose and tail.

Construction of tail: Four 1/8 inch steel fins are spot welded to the tail cone and are braced by a single set of box-type struts.

Figure 38 - No. 80 Land Bomb.

No. 25 Land Bomb and Type 98 No. 25 Land BombType 99 No. 6 Ordinary Bomb