- Posts: 9
- Joined: 25 Sep 2016 17:58
- Location: Carthage
Si I have discorvered there is one week now the existence of a "doom" version of the Hs 129, armed with a 7,5 cm anti-tank gun. But this is all. I would like to have more infos about this version, like his year of introduction for example.
- Posts: 377
- Joined: 18 Feb 2013 00:23
t was decided that the 7.5 cm (2.95 in) semi-automatic Rheinmetall PaK 40 anti-tank gun, which had already been adapted for use in the Junkers Ju 88P-1, would be further modified for use in the Hs 129. This resulted in the BK 7,5 (Bordkanone 7,5), which, even though it weighed 1,200 kg (2,600 lb), was: lighter than the PaK 40; fully automatic; featured a new, hydraulic recoil-dampening system and a new, more aerodynamic muzzle brake. An autoloader system, with 12 rounds in a rotary magazine, was fitted in the empty space behind the cockpit, within the rear half of the wing-root area. The gun and its recoil mechanism occupied a substantial gun pod under the fuselage, and a circular port at the rear of the pod allowed spent cartridges to be jettisoned immediately after firing. While this new variant, the Hs 129 B-3, was theoretically capable of destroying any tank in the world, the added weight worsened the aircraft's general performance and was inferior to previous variants.
The Bordkanone 7,5 was the heaviest and most powerful forward-firing weapon fitted to a production military aircraft during World War II. The only other aircraft to be factory-equipped with similar-calibre guns were the 1,420 examples of the North American B-25G and B-25H Mitchell, which mounted either a 75 mm (2.95 in) M4 cannon, or light-weight T13E1 or M5 versions of the same gun. These weapons, however were hand-loaded, had shorter barrels and/or a lower muzzle velocity than the BK 7,5, resulting in lower ballistic performance, accuracy and rate of fire. The BK 7,5 was unsurpassed as a production aircraft-fitted gun until 1971, when the four-engine Lockheed AC-130E Spectre – equipped with a sideways-aimed, hand-loaded 105 mm (4.13 in) M102 howitzer of about 1,496 kg (3,298 lb); entered service with the U.S. Air Force. The 1,200 kg (2,600 lb) BK 7,5 cannon installation in the Hs 129B-3 was the heaviest forward-firing autocannon ever made for a series production military aircraft, until the introduction of the Fairchild Republic A-10 "Warthog", with its General Electric GAU-8 Avenger seven-barrelled 30 mm (1.18 in) anti-tank Gatling cannon main armament coming in at a total weight of up to 1,830 kg (4,030 lb) with an ammunition load of some 1,100 shells included in a drum magazine integral to the weapon system, much like the much smaller 12-round magazine of the BK 7,5.
From June 1944, only 25 examples of the Hs 129 B-3 arrived at front-line units before the production line was shut down in September (a small number were reportedly also created by converting B-2 aircraft). In the field the B-3 proved deadly, but its small numbers had little effect on the war effort.
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