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As the mission clock passed up through T+64 seconds, the plume suddenly changed shape, showing that it had burned a hole in the liquid hydrogen tank in Challenger ' s ET, causing the tank to leak. The pressure in the tank began to drop, and Challenger ' s onboard computers began to pivot the nozzles of the SSMEs to counter the now-unbalanced ...
The Challenger 2 is the third vehicle of this name, the first being the A30 Challenger, a World War II design using the Cromwell tank chassis with a 17-pounder gun. The second was the Persian Gulf War era Challenger 1, which was the British army's main battle tank (MBT) from the early 1980s to the mid-1990s.
The L30A1, officially designated Gun, 120 mm, Tank L30, is a British-designed 120 mm rifled tank gun, installed in the turrets of Challenger 2 main battle tanks. It is an improved production model of the Royal Ordnance L11 series of rifled tank guns. Challenger 2 tanks and their L30A1 guns are operated by the British and Omani armies.
The Trojan armoured engineer vehicle is based on a Challenger 2 tank chassis, but lacks the main armament. In place of the turret, it has a large hydraulic excavator arm, which can be used to excavate areas, move obstacles, and deposit the fascine that the Trojan carries at its rear.
Its 120mm rifled gun is said to have an effective firing range of at least 3km using armour-piercing rounds. The Challenger also claims the furthest tank-on-tank kill shot in military history ...
British tank designs in the immediate post-World War I era were developments along the same design as the Mark A and were named as Mediums being around 18 long tons (18 t; 20 short tons). The first tank to enter service that broke with the design was known as the "Vickers Light Tank" (it weighed about 12 long tons or 12 tonnes or 13 short tons).
The commission found that the immediate cause of the Challenger accident was a failure in the O-rings sealing the aft field joint on the right solid rocket booster, causing pressurized hot gases and eventually flame to "blow by" the O-ring and contact the adjacent external tank, causing structural failure. The failure of the O-rings was ...
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