No. 80 Ordinary Bomb Model 1No. 25 Ordinary Bomb Model 2
Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices
and Sabotage Devices
Chapter 1 – Section 2
Japanese Navy Bombs
No. 3 Ordinary Bomb Model 2 and No. 6 Ordinary Bomb Model 2
Fuzes: A-1 (a), A-3 (a).
No. 3 No. 6
Over-all length 33 inches. 42 1/2 inches.
Length of body 19 3/4 inches. 25 1/2 inches.
Diameter of body 7 1/2 inches. 9 inches.
Thickness of wall 1/4 inch. 3/8 inch.
Material of wall: Steel.
Type of suspension: Horizontal.

Suspension lug: Two typical Navy suspension lugs 180° removed on the circumference of the bomb body.

Color and markings: Gray over all with a green band on nose and on the ends of the tail fins. Two red lines diametrically opposed run the length of the bomb. New type markings may be found.
No. 3 No. 6
Length of tail 13 1/4 inches. 17 inches.
Width of tail 7 1/2 inches. 9 1/2 inches.
Width of tail fins 3 1/4 inches. 4 1/4 inches.
Dimensions of tail struts None. None.
Material of tail Sheet steel. Sheet steel.
Type of filling Probably picric acid. Picric acid.
Weight of filling 65 pounds, 12 ounces.
Total weight of bomb 70 pounds. 139 pounds.
Charge/weight ratio 47 percent.

Construction of body: The body is constructed of one piece of machined steel turned down to a streamlined shape. The forward end is threaded to receive a nose fuze and the after end is threaded to receive a male base plate. The base plate is threaded exter-nally at both ends. The tail cone screws onto the after end of the base plate. There is no explosive in the tail cone.

Construction of tail: The tail cone consists of four sheet metal sections riveted to an internally threaded ring. The edge of each section has a flange which turns up. The tail fins are secured between flanges of adjoining sections by spot welds. There are no struts to brace the fins.

Figure 43 - No. 3 Ordinary Bomb Model 2 and No. 6 Ordinary Bomb Model 2.

No. 80 Ordinary Bomb Model 1No. 25 Ordinary Bomb Model 2