Bombs used in

Fuzes used with

Material of construction

Over-all length

Type F

Type W

Over-all length of vanes

Type F

Type W

Width of fuze body

These two fuzes are based on the same principle of operation and with few minor varia-tions are similar in appearance. Both fuzes are threaded at the base to receive the long-type boosters; the detonator caps and striker are retained in "All-ways" housings which are free to move. This insures contact of cap and striker, regardless of how the bomb falls. Both fuzes have arming vanes and spindle, which is withdraw upon the rotation of the vanes, freeing the balls and consequently the striker. The outer shoulder of the Type W Fuze is alightly longer than the Type F. Beneath the shoulder of each fuze are threads which screw into the nose-fuze pocket. Vanes of the Type F slant down toward the fuze body, whereas vanes on Type W slant away from the fuze body.

Operation of these two fuzes is the same. Upon being released from the plane, the safe-ty pin is withdraw; the vanes rotates the arming spindle. When the spindle. When spindle is withdraw 0.4 in. in the Type F or 0.5 in. in the Type W, steel balls move into the channel, releasing the striker, which then rests on the creep spring. The dome-shaped surface at the end of the striker cavity insures that striker and detonator-cap holder ap-proch each other, regardless of the bomb's position on impact. Upon impact, the detona-tor cap moves forward, over-coming the creep spring and contacting the striker, deto-nating booster and bomb.

Figure 42
Type F - Mechanical Impact Nose Fuze

Figure 43
Type W - Mechanical Impact Nose Fuze