Type 97 12-kg. Thermite Incendiary BombType 100 50-kg. Incendiary Bomb
Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices
and Sabotage Devices
Chapter 1 – Section 1
Japanese Army Bombs
Type 97 50-kg. Incendiary Bomb

Fuzes: Nose: A-2 (a) or A-2 (b); Tail: None.

Over-all length: 45 inches.

Length of body: 1/2 inch.

Diameter of body: 7 1/2 inches.

Thickness of wall: 3/16 inch.

Material of wall: Steel.

Type of suspension: Horizontal.

Suspension lug: Normal Army suspension lug.

Color and markings: Gray over all. A yellow and white band are stenciled just forward of the suspension lug. There is a red band around the nose.

Length of tail: 18 1/2 inches.

Width of tail: 9 3/16 inches.

Material of tail: Sheet steel.

Dimension of tail struts: Length, 6 3/4 inches; diameter, 5/16 inch.

Type of filling: 400-450 rubber bungs (1 inch long by 1 inch diameter) impregnated with phosphorus dissolved in carbon disulphide. The high-explosive charge in the nose and central burster tube is picric acid.

Weight of filling: Incendiary filling, 37 pounds; picric acid, 5.5 pounds.

Total weight of bomb: 110 pounds.

Charge/weight ratio: 39 percent.

Construction of body: A steel nosepiece is held by three grub screws to a steel sealing plate. The plate is welded to a tubular-steel body by a continous circumferential weld. A burster tube threads into the sealing plate and the joint is made airtight by a lead was-her. A tail cone is welded to the after end of the body.

Construction of tail: Four steel fins are welded to the tail cone and are braced by two sets of tubular struts.

Remarks: This bomb was originally designed to contain gas.

Figure 14 - Type 97 50-kg. Incendiary Bomb.

Type 97 12-kg. Thermite Incendiary BombType 100 50-kg. Incendiary Bomb