DATA:

Over-all length: 3.5 inches.

Diameter: 2.375 inches.

Threaded length: 0.5 inch.

Number of threads: 4 RH.

Employment: 21-cm Wgr. 42 Spr.

DESCRIPTION: This fuze is screwed into the nose of the projectile, and a long ballistic cap is fitted over the fuze, screwing directly to the projectile. An actuating rod reaches from the nose cap to the nose of the fuze and transmits the shock of impact directly to the striker. (See fig. 585.)

The fuze itself is fitted with a plunger in the nose which bears against a striker. The stri-ker is held in the safe position by the standard German centrifugal segments. The primer housing is also held in position by these same segments.

To one side of the striker assembly is a spring-loaded plunger which rides against the cam-shaped base of the upper fuze housing. This upper housing is free to turn in order to set the cam with relation to the spring-loaded plunger. The base of the plunger forms a lock for a centrifugal slider in the side of the fuze body. This slider is used to open or close the instantaneous firing channel through the center of the fuze.

This fuze also has a 0.15-second delay firing channel which is always open.

OPERATION:

Delay Setting. The head of the fuze is turned so that cam holds the spring-loaded plunger in place thus locking the centrifugal slider. In the locked position the central or instanta-neous channel is closed. Centrifugal force throws the segments outward, freeing the stri-ker and the primer housing.

Upon impact the ballistic cap crushes, forcing the actuating rod into the fuze. The striker is thus pushed backwards to meet the primer, which is thrown forward by inertia. The re-sulting flash fires the delay pellet, which fires the projectile.

Instantaneous Setting. The head of the fuze is turned so that the cam does not hold the spring-loaded plunger in place, and it is free to move up and release the centrifugal sli-der. The fuze is armed in the same manner as with the delay setting, but in addition, the centrifugal slider moves out to open the instantaneous channel. If the fuze does not fire immediately, it will fire after the short delay expires.

Figure 585 – Hbgr.Z. 35 D