115 mm HE-FRAG(FS) 3OF18, 3OF27 and 3OF28

extension carrying four steel forward-folding fins. The fins snap out once the projectile has left the muzzle; the diameter is 325.12 mm. The explosive filling for the 3OF18 is 2.788 kg of TNT, for the 3OF27 it is 3.062 kg, while for the 3OF28 it is 3.1 kg. In the last two cases the explosive is A-IX-20 (75 per cent RDX, 22 per cent Aluminium and 3 per cent Wax). Projectiles are fitted with a nose-mounted V-429E point detonating fuze made of steel. The rimmed brass (4G10A) or lacquered steel (4G9) cartridge case has an unusual shape as it is necked approximately halfway along its length. The contents consist of 4.65 kg of DG-4 15/1 propellant. The base is fitted with a KV-5-U electrical primer with a long flash tube. The muzzle velocity of the 3OF18 is 750 m/s; for the 3OF27 and 3OF28 it is 800 m/s. Maximum effective combat range is between 1,500 and 2,000 m and the maximum possible range is of the order of 9,500 m, although accuracy at that range will be minimal. A training round intended specially for training tank crews is the 115 mm 3UOFT6 training round with a 3OFT18 HE-T projectile. The projectile is fired at a muzzle velocity of 800 m/s and emits four independent No 1 tracers for up to 5 seconds from a location in the base so that the trajectory can be followed for training assessment and marking purposes. As the projectile passes through a soft training target the nose-mounted VUBS-1M super-quick point detonating fuze functions to detonate the projectile's TNT bursting charge less than 5 m behind the target.