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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 |
2-kg. Window Bomb |
Fuzes: Pull igniter. |
Over-all length: 37 inches. |
Length of body: 37 inches. |
Diameter of body: 1 3/4 inches. |
Thickness of wall: 1/32 inch. |
Material of wall: Sheet steel. |
Type of suspension: None, hand thrown. |
Suspension lug: None. |
Color and markings: Grey over all. Two yellow labels. One gives instructions for use, the other the following: Silver paper scattering bomb, manufactured October 1944, Navy Air Force Arsenal. |
Length of tail: 12 inches. |
Width of tail: 2 7/8 inches. |
Width of tal fins: 9/16 inch. |
Dimensions of tail struts: Length, 2 inches; width, 3/8 inch; thickness, 1/32 inch. |
Material of tail: Sheet steel. |
Type of filling: 250 paper strips, cylinder containing iron pyrite. |
Weight of filling: Paper strips, 10 ounces; iron pyrite and cylinder, 20 ounces. |
Total weight of bomb: 4 pounds 7 ounces. |
Description: Bomb consists of a nosepiece, body, and end cap. Nosepiece is made of wood and has a hole in the center to accommodate the string attached to the pull igni-ter. End of nosepiece is sealed with a paper disk which is removed when the bomb is to be used. Nosepiece is secured to body by six nails. Body is of light sheet metal construc-tion, soldered longitudinally. After end is closed by an end cap of similar metal and held in place by a sealing tape. |
Four equally spaced tail fins are soldered to the body 1 inch from the after end of the case. Two stets of tail struts are utilized to support the fins. |
Filling of the bomb case consists of 250 metal coated paper strips and a inner cylinder which contains the delay element end ejection charge. Inner cylinder is in the front of the case. It is of ligth sheet metal construction and soldered longitudinally. A metal disk clo- ses the nose end and another metal disk is soldered in place 1 5/8 inches from the tail end. Space between the two disks is filled with iron pyrite to make the bomb nose heavy. Each disk has a 1/2-inch hole in the center through which a metal tube is inser-ted. This houses a standard type pull igniter such as is used in the 5-kilogram parachute flare. An 11 inch length of safety fuse crimped into the after end of the igniter is led to an annular bag containing smokeless powder. |
The 250 paper strips are just aft of the inner cylinder. Two L-shaped metal strips placed back to back hold 125 strips each. Four heavy cardboard strips surround the paper strips to insure their smooth ejection. The paper strips are covered on one side only by a metal foil. |
Operation: The cotton tab on the nose is pulled exposing the pull igniter cord. This cord is pulled and the striker hits a flash cap which ignites the safety fuze. The bomb is thrown from the plane. The safety fuze burn for 40 seconds and sets off the smokless powder which ejects the paper strips. |
Figure 87 - 2-kg. Window Bomb. |
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