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UTU M78
#WIP FUZES
Category
Ammunition, Missiles and precision weapons
Armament 120 mm HE rocket-assisted bomb M77 . Development By Yugoimport SDPR to suit the specific requirements of the M77 bomb. Description This is a super-quick and delay fuze, the delay being set if required. The fuze operates on a combination of setback and centrifugal force, the specific bomb to which it is matched having a degree of spin stabilisation though fired from a smoothbore mortar. The fuze relies upon a Semple rotor for safety; this rotor is spring tensioned and is restrained by a centrifugal detent,
locking into a hole in the rotor. In the nose of the fuze is a firing pin and primary detonator, below this is a plug which can be turned by a turnscrew on the exterior of the fuze. The plug has a hole in it which, in the SQ position, aligns with a fire channel beneath the primary detonator. Adjacent to this plug is a delay lead and a secondary detonator. The rotor, which contains a detonator and a stem of explosive, lies beneath the plug and above the fuze magazine. At rest the rotor is locked by a detent. On firing, this withdraws, but the rotor will not move until the centrifugal detent is withdrawn under the influence of spin. Once this frees, the rotor is free to turn under spring tension, positioning the detonator under the plug. On impact, if set for SQ action, the firing pin strikes the primary detonator and the flash passes down through the channel in the plug, firing the rotor detonator and then the magazine. If the plug is turned to the delay position the flash from the primary cannot pass through and diverts to the delay filling, burning through and firing the detonator. This in turn fires the rotor detonator through a fire channel and the magazine is fired as before. Manufacturer Yugoimport SDPR.