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Defense Products Catalog — Page 126

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107 mm HE bomb M329, M329A1, M329B1
Ammunition, Missiles and precision weaponsAmmunition, Missiles and precision weapons
United States
107 mm HE bomb M329, M329A1, M329B1
Armament US 107 mm Mortars M2 and M30 . Development This mortar and its associated ammunition was developed in the 1920s for the US Chemical Warfare Service production. However, it was limited and it was not until 1943 that it was approved for general service using explosive bombs. The basic bomb design has remained the same throughout the mortar's life, minor improvements being made from time to time. The 107 mm mortar and its ammunition became obsolescent in US service during the mid-1990s, being replaced by the M120/M121 120 mm mortar. The 107mm mortar is, however, widely used and may be encountered throughout the world. Description The bomb body is parallel-sided, with an ogival head and more generally resembles an artillery projectile than a conventional mortar bomb. A doughnut shaped cloth bag containing the first five propelling increments is never removed. The remainder of the charge consists of M8 sheet propellant increments, which are removed to adjust range. The nose adaptor is threaded for the fuze, which may be impact, delay or proximity. At the rear of the bomb is the cartridge container and obturation system, which is unique to this weapon. The 107 mm mortar is rifled, which presents the problem of how to drop load it and still engage with the rifling when fired. At the base of the bomb is a tubular cartridge container, which has the usual type of primary cartridge inserted into it and secondary increments fitted around it. The cartridge container is screwed into the base of the bomb; around the upper end of the container is a copper `rotating disc' which is dished so that the concave face is towards the cartridge container. This ensures the diameter of this dished plate is less than the bore of the mortar, enabling the bomb to be drop loaded in the usual way. Below this rotating disc lies a steel `pressure plate', of the same diameter as the bomb body. On firing, the propellant charge explodes and the gas pressure forces the pressure plate forward. This forces the dished rotating disc to flatten out so that its edges bite into the rifling of the barrel and form a gas seal. The attachment of the rotating disc to the bomb is such that any rotation of the disc, induced by the rifling, will be transmitted to the bomb. Therefore, as the gas pressure drives the bomb up the bore, the interaction of the disc in the rifling grooves develops spin in the bomb. The M329A2 has a pre-engraved rotating band which engages the rifling of the mortar bore as the bomb is dropped in the tube. There is also an obturator on the projectile base, which functions similarly to the pressure disc of the M329A1 to seal the rotating band in the mortar tube upon firing. The M329B1 has a forged body with an integral base. Manufacturer US government contractors.Read More
107 mm illuminating bomb M335, M335A1
Ammunition, Missiles and precision weaponsAmmunition, Missiles and precision weapons
United States
107 mm illuminating bomb M335, M335A1
Armament US M30 107 mm mortars. Development By US Ordnance Department as improvement on earlier models. Description This is of the same general form as the HE M329A1, differing principally by having the base of the bomb as a separate component attached to the body by shear pins. The bomb is assembled with a mechanical time fuze and consists of five major components: an illuminating canister assembly, a parachute assembly, an expelling charge assembly, a parachute holder assembly and the fuze. The internal components are keyed together to prevent differential rotation in flight. The illuminating canister is fitted with anti-rotational brakes that reduce canister spin at the time of ejection and prevent the parachute lines from twisting. When the time fuze functions, it ignites the expelling charge which explodes. The flame ignites the flare composition; the gas pressure forces the flare container away from the fuze, thus putting pressure on the baseplate and shearing the connecting pins. The plate and cartridge container fall away and the pressure forces the parachute and flare container from the bomb body. As the flare container exits, the two hinged plates are thrown outwards by springs and act as airbrakes to reduce the spin on the flare container, this ensures the composition burns evenly and progressively during its fall. The M335 and M335A1 differ only in filler and performance is essentially identical, except as noted. Manufacturer US government contractors.Read More
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