Type 99 No. 25 Ordinary Bomb Model 1No. 80 Ordinary Bomb Model 1
Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices
and Sabotage Devices
Chapter 1 – Section 2
Japanese Navy Bombs
Type 2 No. 50 Ordinary Bomb Model 1

Fuzes: A-3 (f), B-2 (a).

Over-all length: 78 inches.

Length of body: 38 1/2 inches.

Diameter of body: 15 1/2 inches.

Thickness of wall: 1 inch at base, 7 1/2 inches at nose.

Material of wall: Steel.

Type of suspension: Horizontal.

Suspension lug: Two guide studs on the bomb body position the Navy type suspension band.

Color and markings: The bomb is gray overall with a green-tipped nose, brown nose band and green tail struts.

Length of tail: 39 1/2 inches.

Width of tail: 15 1/2 inches.

Width of tail fins: 7 3/4 inches.

Dimensions of tail struts: Length, 10 3/4 inches; width, 3 1/4 inches; thickness, 1/8 inch.

Material of tail: Steel.

Type of filling: Cast blocks of Type 98 explosive.

Weight of filling: 148 pounds.

Total weight of bomb: 1,100 pounds.

Charge/weight ratio: 13 percent.

Construction of body: The bomb body is constructed of one piece of machined forged steel. A fuze pocket is drilled in the nose. The after end of the body is threaded internal-ly to accommodate a male base plate. There is a fuze pocket drilled in the base plate. A sheet steel tail cone is attached to the base plate by eight bolts. Three trap doors in the tail cone give access to the fuze pocket.

Construction of tail: Four Navy type tail fins are spot-welded to the tail cone. They are braced by a single set of box-type struts.

Figure 41 - Type 2 No. 50 Ordinary Bomb Model 1.

Type 99 No. 25 Ordinary Bomb Model 1No. 80 Ordinary Bomb Model 1