ROCKETS USED IN

FUNCTIONING

ARMED CONDITION

ARMING TIME

MAX. BODY DIAMETER

OVERALL LENGTH

VANE SPAN

COLOR

DESCRIPTION:

The fuze consists of a vane cap, fuze body, and magazine. The vane cap is firmly atatched to the vane cap hub, which is threaded over a hollow projection on the top of the fuze body. Extending down from the center of the hub is a pin, which in the unar-med position forces the striker downwards against its spring. Two small pins are located 180° apart on the outer edges of the hub. In the unarmed position these pins are en-gaged in two shallow slots in the setback collar.

The setback collar is a brass sleeve fitting around the vane hub and resting on the inertia spring. On the bottom edge of the collar are four studs, which engage in holes drilled in the top of the fuze body, when the fuze is unarmed. The tapered top edge of the setback collar is cut away in two places to form two shallow slots, two deep slots, and a cut down portion connecting them.

In the lower portion of the fuze body is located a shuttered detonator. This detona-tor is held offset in the unarmed position by the point of the striker. A magazine adap-ter is screwed into the bottom of the fuze body, and a thin metal magazine is screwed to the adapter.

OPERATION:

When the rocket is fired, the setback collar moves down against its spring and dis-engages the stop pins on the hub from the shallow slots. The arming vanes then rotate through an arc of 45°, moving the hub around until its stop pins come up against the tapered edge of the setback collar. The fuze is held in this position until the expiration of the burning period of the rocket. At this time acceleration ceases, and the setback collar rises, the stop pins on the hub moving into the deep slots in the collar. The collar is allowed to move up far enough to disengage the four studs from the holes in the fuze body. The vanes are now free to rotate both the hub and the setback collar through the remaining 5 or 5½ rotations to arm the fuze. At this point the whole arming as-sembly falls clear of the fuze.

As the vane hub risesm the striker is forced upward by its spring, eventually remov-ing the point of the striker from the detonator shutter. The shutter spring then aligns the detonator with the striker. On impact, the striker is driven down against its spring into the detonator, initiating the C.E. (tetryl) stemming in the stemmed disc, which in turn fires the C.E. (tetryl) pellet in the magazine.

REMARKS:

1. The fuze is fitted with a shipping safety clip (not illustrated), which engages in one of the two drilled holes in the outside of the fuze body and carries a stud which prevents rotation of the arming vanes. The clipped is locked in place by a lead seal and is removed manually before the rocket is fired.