8.8 cm Pak 43

KwK 43 and Pak 43s were initially manufactured with monobloc barrels but the extremely high muzzle velocity and operating pressures caused rapid barrel wear, resulting in a change to a two-piece barrel. This did not affect performance but made replacing a worn out barrel much faster and easier than before. A new PzGr.39/43 APCBC-HE projectile was designed, which, apart from the addition of much wider driving bands, was identical to the older PzGr.39-1 APCBC-HE projectile used by the 8.8 cm KwK 36 and Pak 43 guns. The wider driving bands resulted in an increased weight to for the PzGr.39/43. The older PzGr.39-1 was used for the KwK & Pak 43 before new PzGr.39/43 rounds came into use but only if the gun had fired no more than 500 rounds. Over this, the expected barrel wear combined with the narrow driving bands could lead to a loss of pressure. The new PzGr.39/43 could be fired without loss of pressure until the barrel was worn out, thus requiring no restriction. PzGr.39-1 FES & Al all up weight: 10.2 kg (9.87 kg without fuse & bursting charge) PzGr.39/43 FES & Al all up weight: 10.4 kg (10.06 kg without fuse & bursting charge) The same 278-gram BdZ 5127 fuse and 59-gram Amatol bursting charge was used for PzGr.39-1 and PzGr.39/43 rounds, requiring armoured targets of 30 mm or thicker to ignite after penetration for maximum effect. ==Versions==

in September 1943 The main version of the Pak 43 was based on a highly effective cruciform mount, which offered a full 360 degree traverse and a much lower profile than the ubiquitous anti-aircraft 8.8 cm Flak 37. However the manufacture of this version was initially slow and costly, a situation that was made worse by the destruction of the carriage production line by Allied bombing. As part of the design effort from Krupp to compete with the Flak 41, a barrel had been produced to prove the ballistics and design. This barrel design was developed, via an intermediate design known as the Gerät 42, to become the barrel used with Pak 43/41 design. When the Pak 43 was delayed, Krupp was asked to produce a weapon using this barrel using as many existing components as possible. This previous barrel design was then designated the Pak 41. The Pak 41 barrel was fitted with a horizontal sliding-block breech mechanism resembling that of the 7.5 cm Pak 40, and the semi-automatic gear was a simplified version of that used on the Pak 43. The two-wheel split-trail carriage was from the 10.5 cm leFH 18 field howitzer, with the wheels from the 15 cm s FH howitzer. The Pak 41 was ballistically identical to the Pak 43 and fired the same ammunition, hence its performance was identical. Sources are unclear as to whether the Pak 41 and the Pak 43 barrels were identical; either way it is responsible for the Pak 43/41 designation for the whole design. The 43/41 proved heavy and awkward to handle in the mud and snow of the Eastern Front and gunners referred to 43/41 as the "barn door" (), a reference to the size and weight of the gun. Nevertheless, the improvised Pak 43/41 proved an effective substitute for the Pak 43 until sufficient numbers of the more complex cruciform mounts could be manufactured to replace it in service. The Pak 43 was also mounted in German armored vehicles, and this version was known as the 8.8 cm KwK 43. Versions of this gun were mounted in a number of German armored vehicles under different designations, including the Tiger II heavy tank (KwK 43 L/71) and several tank destroyers: the Hornisse/Nashorn (Pak 43/1), Ferdinand/Elefant (Pak 43/2, early name Stu.K. 43/1), and Jagdpanther (Pak 43/3 and Pak 43/4, early name Stu.K. 43). A few examples of the Tiger II-based Jagdtiger were also completed with the 8.8 cm weapon due to a shortage of the 12.8 cm Pak 44, but these tank destroyers are not believed to have seen operational service. ==Service==

There were 578 8.8 cm Pak in German army service on 1 October 1944 and 829 on 1 January 1945. The Royal Hungarian Army also had a minimum of 31 pieces. The Hungarian First Army used them in the Northeastern Carpathians and later withdraw them to the "Attila" Line for the defence of Budapest. ==Ammunition and penetration==

The Pzgr. 39/43 and HE shells were generally available. Pzgr. 40/43 were in severely short supply. Pzgr. 39/43 APCBC-HE • Type: Armour-piercing Capped with Ballistic Cap - High Explosive • Projectile weight: 10.4 kg (22.92 lbs) • Muzzle velocity: Pzgr. 40/43 APCR • Type: Armour-Piercing Composite Rigid • Projectile weight: 7.3 kg (16 lbs) • Muzzle velocity: 1,130 m/s (3,707 ft/s) Gr. 39/3 HL (HEAT) • Type: High explosive anti-tank • Projectile weight: 7.65 kg (17 lbs) • Muzzle velocity: 600 m/s (1,968 ft/s) • Penetration: 110 mm ==See also==