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M84 and M84A1 time fuzes
#WIP FUZES
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament 81 mm illuminating rounds. Development By US Army Ordnance. Description The M84 and M84A1 fuzes are of the single-purpose, powder train, selective time types and are used only with 81 mm illuminating ammunition. The two fuzes are identical, save for powder train chemicals and the fact that the M84A1 has a time scale of 50 seconds with 2 second intervals, while the M84 has a range of 25 seconds with 5 second intervals. The fuzes consist of a primer, powder train, timing rings and a black powder expelling
charge. The fuze is armed by removing the safety wire. At this point the inertial plunger is held by two shear pins passing through the plunger guide. Setback causes the plunger to shear the pins and strike the primer at the base of the plunger guide. The primer ignites the powder train, which burns for the preset time and then ignites a black powder pellet and the expelling charge. The expelling charge ejects the parachute and illuminant assemblies through the base of the projectile. Manufacturer US government contractors.