Description
Type 4 No. 25 Mk 29 was in the process of being developed at the end of the war to take the place of the No. 25 Mk 3 bombs as a weapon for use against large bomber formations. It was designed either to be dropped in the same manner as the Mk 3 bombs, or to be detonated in the plane by the pilot. The bomb incorporates a larger explosive charge, and smaller quantity of incendiary shrapnel, than do the Mk 3 bombs of the same size.
The nose section of the bomb is conical in shape, and is filled with a wooden block except for a central channel filled with explosive leading into the main charge of the bomb. An adapter is supplied at the nose to receive the type 3 electric gaine.
The barrel of the bomb is cylindrical in shape, and is filled with incendiary shrapnel of the white phosphorus filled steel pipe type. A central burster charge of high explosive is surrounded by the incendiary shrapnel.
The conical tail section is filled with a central burster charge surrounded by the same type of incendiary shrapnel as is found in the barrel of the bomb. An adapter is provided at the apex of the tail cone to receive the type 99 Mk 3 tail fuze D-2 (a), without centrifugal arming. Tail fins are standard Navy design without rotational offset, such as is found in the Mk 3 bombs.
The bomb is fuzed in the nose with the type 3 electric gaine fitted with a cable which leads into a firing switch in the cockpit of the airplane. It is to be used when the pilot desires to fire the bomb in the airplane in a suicide attack on bomber formations.
The tail fuze is a type 99 Mk 3 without centrifugal arming. It is to be used when the bomb is dropped in an air to air bombing attack.
This bomb had not gone into production at the end of the war, but was considered by the Japanese to be a practical weapon for defense against heavy bombers.
The data on this bomb is the result of incomplete investigation, and must not be considered as specific, accurate information.
Hazardous Components
No information about hazardous components.
See Also
General Information, Japanese Navy Bombs
Bomb, 250 kg Air to Air, Type 2 No. 25 Mk 3 Model 1
Source(s)
