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Cartridge, 90 mm: HE M71 and HE-T M71A1
Регіон
South Korea
Turkey
Greece
Italy
Категорія
Ammunition, Missiles and precision weapons
The 90 mm HE M71 and HE-T M71A1 are fixed rounds with the projectile rigidly crimped into the brass cartridge case. A single gilding metal drive band encircles the projectile just forward of the case/projectile junction. The projectile is a hollow steel forging with a boat-tailed base and a streamlined ogive. Fillings may be cast TNT or Composition B; some early production rounds may be encountered with 50:50 Amatol and a booster surround comprising a small amount of TNT. The 90 mm HE M71 may have a normal or deep
cavity under the nose-located fuze well. If a deep cavity is involved a 140 g supplementary charge of TNT in an aluminium liner is inserted into the cavity. An M10 tracer is threaded into the projectile base on the HE-T M71A1. The 70:30 brass rimmed cartridge case is of the M19 or M19B1 type and uses an M28B2 or M28A2 percussion primer press fitted into the base. The propellant load for the M71 is 3.316 kg of M15 propellant and for the M71A1 is 2.42 kg of multiperforated M1 propellant. The 90 mm HE M71 has a muzzle velocity of 823 m/s and a maximum range of 17,800 m. The 90 mm HE-T M71A1 has a muzzle velocity of 731 m/s and a maximum range of 15,300 m. The live firing training equivalent of the 90 mm HE M71 is the TP-T M353A2. It differs from the M71 series in some respects in that it uses M30 propellant which gives a higher muzzle velocity (914.4 m/s) and reaches a greater maximum range (21,000 m). The propellant is ignited by a M58 percussion primer. Complete round weight is 19.92 kg and it is 942.6 mm long overall. A completely inert dummy round for handling and loading training equivalent to the 90 mm HE M71/M71A1 is known as the Cartridge, 90 mm: Dummy, M12. The M12 uses a one-piece bronze projectile and cartridge case, the M12B1 is iron while the M12B2 is manganese bronze. All use a bronze or steel base and may be fitted with a dummy or inert fuze. The 90 mm HE M71 round was developed during the Second World War to become the standard time fuzed anti-aircraft projectile for the 90 mm Anti-aircraft Gun M1 and the later M117 and M118 anti-aircraft guns.