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Cartridge, 40 mm: L/60 PFHE
Регіон
Brazil
Категорія
Ammunition, Missiles and precision weapons
The 40 mm L/60 PFHE is a fixed round with a brass cartridge case. The cartridge case is crimped rigidly to the projectile by two 360º crimping bands. A copper drive band encircles the projectile just above the cartridge case/projectile junction. The 40 mm L/60 PFHE projectile follows the same general lines as the 40 mm L/70 PFHE (see separate entry), and uses a curved base ('duck-tailed') shell body manufactured from a special high-fragmentation steel. The explosive content is 90 g of Octol. The shell interior
walls are lined with a total of 600 spherical tungsten carbide pellets, each 3 mm in diameter. The forward end of the streamlined projectile is occupied by the proximity fuze which operates on the Doppler principle. The fuze has an automatic sensitivity control preventing initiation of the fuze by surface objects and sea or ground reflections when passing over them at the low altitudes, produced by low gun barrel elevation angles. The fuze also has a high-sensitivity electrical impact function and an electrical self-destruct device, together with delayed arming and bore and muzzle safeties. In the event of a proximity burst the Octol charge produces a very high blast effect. The shell body fragments while the blast also spreads the 600 tungsten carbide spheres. Due to their high initial velocity and high inertia, the pellets are capable of inflicting great damage to aircraft and missile components at ranges of up to several metres. This is in addition to the damage caused by the shell body fragments. The effective range against aircraft and helicopters is up to 5.5 m and against missiles 1 to 2 m. This provides an increased on-target effect up to 12 times and a greatly increased target area when compared to point detonating ammunition. The brass cartridge case, which can be reused several times if required, has a semi-rimmed base and is fitted with an M80 percussion primer. The propellant charge is flash reduced NC 1281 single-base nitrocellulose powder producing a muzzle velocity of 860 m/s. The 40 mm L/60 PFHE ballistics match those of other 40 mm L/60 projectiles. The 40 mm L/60 PFHE round is the L/60 counterpart to the 40 mm L/70 PFHE (qv).