ROCKETS USED IN

FUNCTIONING

ARMED CONDITION

FUZES USED WITH

ARMED SPEED

MAX. BODY DIAMETER

OVERALL LENGTH

WEIGHT

GENERAL:

The Mk 30-3 Rocket fuze is similar to the Navy Point Detonating projectile fuze, Mk 30-3. This fuze is armed by creep and centrifugal force and thus can only be used in spin-stabilized rockets. The fuze is designed to function on impact with super-quick (instantaneous) action.

DESCRIPTION:

The fuze consists of four principal parts: the base which contains the relay detona-tor, holder, and setting device; the nose or detonator assembly which contain the stri-ker and detonator; the plastic ogive; and the flash tube which is fitted in the center of the ogive and holds the nose and the base together. The striker is held in position by a gliding metal cap which collapses on impact. The setting device consists of an inter-ruptor plunger, a spring, and a setting sleeve. The hole in the setting sleeve is off cen-ter and the position of the sleeve determines whether the hole is aligned wiht the in-stantaneous ("SQ" or "On" setting) or wheter the wide shoulder of the sleeve engages the interruptor ("OFF" setting). If the sleeve is set for "SQ" or "ON", the interruptor is free to move outward by creep and centrifugal force to compress the action. If the sleeve is set on "OFF", the wide shoulder engages the interruptor to prvent it from moving outward and the interruptor blocks the flash tube.

OPERATION:

The fuze is designed for super-quick action on impact. The "OFF" setting is a safety feature to prevent premature detonation and the setting sleeve must be turned to "SQ" or "ON" before rocket is launched. When rocket is launched, the interruptor moves out-ward by creep and centrifugal force to compress the spring and open the flash tube. On impact, the glided metal cap collapses and the striker is driven into the detonator, the flash of which initiates the relay detonator and the main charge.