Bombs used in

Fuze found with

Material of construction

Over-all length

Over-all length of vanes

Width of fuze body

The fuze has a main body threaded to fit into the nose-fuze pockte of the bomb and also internally threaded to take the long-type booster, with a booster lead-in screwed in the upper part. There is an inner sleeve in the main body in which the striker containing the twin firing pins is free to slide. The striker is prevented from moving in the unarmed con-dition, by two steel balls resting against the sleeve and also by the creep spring. An arming spindle prevents the balls from moving in and releasing the striker. The vanes are attached to a collar in which are two pins traveling in annular space. The vanes do not rise during rotation, but the arming spindle rises through the vane collar. The vanes are prevented from rotating by a safety pin through the fuze body and arming spindle.

Operation

When the bomb is dropped, the safety wire withdraws the arming pin. This allows the va-nes to rotate, but the pin in the vane collar, which extends  into the annular space, pre-vents the collar from rising. When the arming spindle has withdraw about the balls roll in-wards, freeing the striker and sleeve. On impact the striker and twin primer cap holder overcame the creep spring; the firing pins hit the twin primers.

The fuze is completely armed when the arming spindle projects 1.5 in above the vane collar.

Figure 39
Type A - Mechanical Impact Nose Fuze