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Cartridge, QF, 25-pounder, Smoke
Регіон
Pakistan
Категорія
Боєприпаси, ракети та високоточне озброєння
The Cartridge, QF, 25-pounder, Smoke is an armament 25-pounder field guns. Development Intended to provide screening smoke, this base ejection projectile was developed alongside the HE projectile during the late 1930s. The standard projectile was the Mk IID although other marks and variants, up to Mk VIIB, were produced. As far as can be determined this round is now produced only by the Pakistan Ordnance Factories. The US Cartridge, 105 mm: HC, M84 was developed using the 25-pounder Smoke projectile as a basis.
Description This steel base ejection shell (actual calibre 87.6 mm) has a streamlined outline, a flat base with only a slight taper and a copper driving band. The front of the shell body is threaded to accept a steel adaptor into which a No 221 time fuze is threaded. Below the fuze is a 42.5 g black powder charge contained in a bag located just above a steel baffle plate. The main interior of the shell has parallel walls and contains three cylindrical smoke containers separated from each other by millboard washers. Each container is filled with a smoke-producing composition which is ignited after the time fuze functions. As the fuze functions it creates internal pressure against the baffle plate to force off the steel baseplate and eject the smoke canisters. The same charge also creates flash to travel down a central channel to ignite the contents of the smoke canisters which then produce dense clouds of grey/white smoke. The cartridge case is drawn 70:30 brass and fitted with a No 11 percussion primer in the base. The normal cartridge carries three charges sewn into linen or cambric bags, with the charges being removed by hand to suit the particular requirement. Charge 1, the 'core' charge, is coloured red, Charge 2 is white and Charge 3 is blue. The charges are retained in place by a fibre cup. The propellant involved is cordite-based, the usual propellants are triple-base flashless NQ 018 and NQ 050 weighing 857 g. The Super Charge was not normally used with the Smoke projectile. Ballistic data for the charge system is as follows: Charge 1 - MV 198 m/s - max range 3,566 m Charge 2 - MV 297 m/s - max range 7,132 m Charge 3 - MV 442 m/s - max range 10,790 m.