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152 mm FRAG-HE OF-540
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China
Iraq
Bulgaria
Czech Republic
Romania
Slovakia
Ukraine
Категорія
Боєприпаси, ракети та високоточне озброєння
The 152 mm FRAG-HE OF-540 forms part of a separate loading item of ammunition consisting of the projectile and a variable charge system contained in a brass or lacquered steel cartridge case. The projectile is forged steel with a long streamlined ogive, a boat tail and a shallow bourrelet. A single copper drive band is just over 24 mm wide. The contents are nominally 6.24 kg of TNT although many references quote figures around 5.86 kg. One version of the 152 mm FRAG-HE OF-540, sometimes referred to as the OF-540B,
has a two-part construction with which the forward part of the ogive can be unthreaded, apparently to accommodate large time fuzes. The 152 mm ammunition uses a two-part variable charge system contained in brass or lacquered steel cartridge cases 547.5 mm long. The two parts are the Reduced Charge and the Full Charge, each in its own cartridge case. The Reduced Charge uses 9/7, 4/1 and 8/1 Trinitrocellulose powder in a series of 12 bags. Charge 6, the lowest, comprises the base bag charge only, to which a series of equal size bags are added creating higher charges. One charge bag is added to the base charge bag to comprise Charge 5, two are added for Charge 4, three for Charge 3 and five for Charge 2. To create the Full Charge two further equal size bag charges are added; as mentioned previously a fibre cup holds the charge bags in place. The total weight of the Full Charge propellant is 8.8 kg. Maximum muzzle velocity produced by the Reduced Charge is 655 m/s. Both charges are initiated by a KV-4 percussion primer in the base of the cartridge case. With a 152 mm gun-howitzer such as the D-20 the Reduced Charge muzzle velocities vary from 282 to 511 m/s. This produces ranges of 6,710 to 13,400 m. The Full Charge produces a muzzle velocity of 655 m/s and a maximum range of 17,400 m. When fired from the gun-howitzer used on the 152 mm Self-propelled Gun-Howitzer M-1973 ( 2S3 ) the 152 mm FRAG-HE OF-540 is quoted as having a maximum range of 18,500 m. When fired from the 152 mm 2S19 Self-propelled Gun-Howitzer or the towed 152 mm Gun-Howitzer 2A65 the maximum range is 24,700 m.