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<blockquote data-quote="Petrus" data-source="post: 74840" data-attributes="member: 341"><p>If I am not mistaken the Challenger was armed with 17pdr Mark II gun while the Sherman had a specially modified version, according to some sources designated as Mark IV, that could be squeezed into its turret.</p><p></p><p>This is what Wikipedia says on the issue:</p><p></p><blockquote><p>It was W.G.K. Kilbourn, at the time working for the Department of Tank Design, who would transform the prototype into the tank that would serve the British forces from D-day onwards. The first thing Kilbourn had to fix was the lack of a workable recoil system for the 17 pounder. The 17 pounder would travel 40 inches back as it absorbed the recoil of the blast. This was too long for the Sherman turret. Kilbourn solved this problem by redesigning the recoil system completely rather than modifying it. The recoil cylinders were shortened to allow the turret to take the gun and its recoil, and the new cylinders were placed on both sides of the gun to take advantage of the width of the Sherman's turret rather than be hindered by its height. The gun itself was also rotated 90 degrees to allow for left handed loading.</p><p></p><p>The next problem encountered by Kilbourn was that the gun cradle, the metal block the gun sits on, had to be shortened to allow the gun to fit into the Firefly, and thus the gun itself was not very stable. Kilbourn had a new barrel designed for the 17 pounder that was wider at the base, which helped solve the stability problem. A new mantlet was designed to house the new gun and accept the modified cradle. Thus, while the 17 pounder for the Firefly was a modified variant, it would have to be factory built specifically for it.</p></blockquote><p></p><p>As I understand it the Challenger's turret was still too narrow, so it must have been quite high to accomodate all the 17-pdr's mechanism (esp. recoil brakes).</p><p></p><p>Piotr</p></blockquote><p></p>
[QUOTE="Petrus, post: 74840, member: 341"] If I am not mistaken the Challenger was armed with 17pdr Mark II gun while the Sherman had a specially modified version, according to some sources designated as Mark IV, that could be squeezed into its turret. This is what Wikipedia says on the issue: [quote]It was W.G.K. Kilbourn, at the time working for the Department of Tank Design, who would transform the prototype into the tank that would serve the British forces from D-day onwards. The first thing Kilbourn had to fix was the lack of a workable recoil system for the 17 pounder. The 17 pounder would travel 40 inches back as it absorbed the recoil of the blast. This was too long for the Sherman turret. Kilbourn solved this problem by redesigning the recoil system completely rather than modifying it. The recoil cylinders were shortened to allow the turret to take the gun and its recoil, and the new cylinders were placed on both sides of the gun to take advantage of the width of the Sherman's turret rather than be hindered by its height. The gun itself was also rotated 90 degrees to allow for left handed loading. The next problem encountered by Kilbourn was that the gun cradle, the metal block the gun sits on, had to be shortened to allow the gun to fit into the Firefly, and thus the gun itself was not very stable. Kilbourn had a new barrel designed for the 17 pounder that was wider at the base, which helped solve the stability problem. A new mantlet was designed to house the new gun and accept the modified cradle. Thus, while the 17 pounder for the Firefly was a modified variant, it would have to be factory built specifically for it.[/quote] As I understand it the Challenger's turret was still too narrow, so it must have been quite high to accomodate all the 17-pdr's mechanism (esp. recoil brakes). Piotr [/QUOTE]
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