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107 mm HE bomb M329, M329A2, M329B1
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament US M2 and M30 107 mm mortars. Development By US Ordnance Department as an improvement on earlier designs. Description The M329A2 represents the only major design change in the history of the 107 mm mortar. This projectile is boat tailed and even more like an artillery shell than the previous models, an appearance which is enhanced by the presence of a rotating band. The complete round consists of a projectile body, the fuze and the tail assembly. The forged steel body has a pre-engraved rotating band and
a neoprene rubber obturating ring near the base. The rotating disc/pressure plate system of previous rounds has been abandoned in this design. The tail assembly consists of a cartridge container and ignition cartridge, a propelling charge and a striker-nut assembly. Below the nose is a deep fuze cavity containing a TNT supplementary charge that is removed when using long proximity fuzes. To load, the bomb is positioned so that the pre-engraved driving band engages in the rifling grooves of the mortar, and is then released to drop down the barrel. When the propelling charge fires, the gas pressure expands the neoprene obturating ring and provides the gas seal. The engagement of the driving band in the rifling generates the desired spin as the projectile moves up the barrel. Manufacturer US government contractors.