130 mm Smoke DTs-1

point-detonating V-429 nose fuze strikes the ground, it ignites an RDX and Tetryl bursting charge in a tubular housing extending some two-thirds of the way down the projectile cavity. This breaks open the body walls and releases the white phosphorus which comes into contact with the atmosphere clouds and grey/white smoke is produced. The 70:30 drawn brass cartridge case is issued in two versions; Full Charge and Reduced propellant load. The Full Charge contains 13.5 kg of propellant loaded in a lower and upper bag, together with 2.5 kg of loose propellant in bundled stick form. An increment completes the Full Charge while removal of this increment creates Charge 1. The Reduced Charge weighs 6.75 kg and is supplied in a separate cartridge case. The top charge in the Reduced category is formed using the full complement of a base charge and two equal sized bags, forming Charge 2. Removal of one of the equal bags creates Charge 3 while removal of both equal bags, leaving only the base charge, creates Charge 4. A percussion primer is pressed into the cartridge case base to ignite both Full and Reduced propellant loads. The Full Charge produces a muzzle velocity of 930 m/s and provides a maximum range of 27,490 m. The Reduced charge, Charge 2, produces a muzzle velocity of 705 m/s and a range of 19,130 m. The 130 mm Smoke DTs-1 projectile is described as a Target Marker Smoke projectile and is entirely orthodox in construction and operation, unlike its Chinese NORINCO equivalent which relies on a system of 24 smoke canisters released on target. As far as can be determined, the 130 mm Smoke DTs-1 is no longer in production other than in Egypt , Iran and (possibly) Iraq , although stocks may remain in service with many 130 mm Field Gun M-46 users.