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Ammunition for US 3 in/50-calibre naval guns HE-MT
Регіон
Norway
Italy
Spain
Категорія
Ammunition, Missiles and precision weapons
The Ammunition for US 3 in/50-calibre naval guns HE-MT is the 3 in/50 rounds are fixed with the thin-walled forged steel projectiles securely crimped into brass Mk 7 cartridge cases by a single cannelure just behind a wide pressed copper drive band. Various types of projectile case will be encountered, including ductile and high-fragmentation steel, but most have nose fuzes, either proximity or point-detonating. Projectile fillings also vary but as a general rule Composition A-3 (RDX/Wax 91/9), Composition B and
similar explosives have taken the place of the earlier TNT. Projectile types include Mks 25 (Illuminating - no longer used), 27, 29, 31 and 33. Variations between the various marks include the type of steel involved, the shape of the cavity, screw threads and lengths. The brass Mk 7 rimmed cartridge case (the Mk 9 is an alternative) has a distinctive neck just behind the junction with the projectile. The most common propellant charge is 1.859 kg of M6 flashless propellant although other types of single-base multiperforated grain powders will be encountered. The propellant charge is held against the cartridge base and the Mk 41 percussion or Mk 42 electrical primer tube by a wad fronted by a combustible distance-piece which contains lead foil. Muzzle velocity for most rounds is of the order of 823 m/s. HC High Capacity, intended for use against surface targets and fitted with PD fuzes such as the M557. Originally filled with 336 g of TNT (typical), more recently produced projectiles now contain 577 g of Composition A-3. HE-MT A mechanical time fuzed round which was intended to completely replace the AA. HE-IR Fuzed with an infra-red proximity fuze. Not procured in quantity. HE-IR/PD Fuzed with an infra-red proximity fuze with an additional impact feature. Not procured in quantity. HE-PD Originally intended to replace the HC rounds, this round has a point-detonating fuze for use against surface targets. VT Intended for use against air targets this round has a radio proximity fuze. BLP Inert training projectile with dummy fuze. BLT Inert training projectile with tracer and dummy fuze. The 3 in/50 medium calibre dual-purpose gun has been in US Navy service for many years, although it has now been largely superseded by more modern equipments.