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130 mm Illuminating SP-46
Регіон
China
Iran
Iraq
Категорія
Боєприпаси, ракети та високоточне озброєння
The body of the 130 mm Illuminating SP-46 is forged steel and it is shorter than other 130 mm projectiles. The nose is long and streamlined and the bourrelet is more pronounced than on other 130 mm projectiles. A single copper driving band, 23.87 mm wide, encircles the body. The base is flat and there is no boat tail. The projectile baseplate is held in place by two shear pins and the base has three balancing holes, creating an imbalance to ensure a clean removal from the projectile rear when required. The nose
fuze cavity is occupied by an aluminium TM-16L or VM-60 time fuze. When the fuze functions, ideally 700 m over the target area, it ignites a 780 g black powder ejector charge in a light metal container located under the fuze well. The resultant internal pressures force down on the contents to push off the projectile base and eject the illuminating flare, which is also ignited by the ejector charge. Once the flare is out of the projectile body a single main parachute deploys to stabilise the flare canister and descend at a rate of approximately 10 m/s. The flare contains 2.38 kg of a magnesium-based illuminating composition which creates a white light with an intensity of 500,000 candela for up to 40 seconds. The 70:30 drawn brass cartridge case is issued in two versions; Full Charge and Reduced propellant load. 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 maximum range at which the flare can be deployed is approximately 25,000 m, and the minimum is about 6,000 m.