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A Sherman Firefly with the 17-pounder, South African National Museum of Military History, 2014. The 17-pounder outperformed all other Allied armour-piercing guns, and was quickly adapted for use on various tank chassis. However, few tanks were capable of carrying such a large gun due to the size limitations of their turret rings.
The first thing Kilbourn had to fix was the lack of a workable recoil system for the 17-pounder. The 17-pounder traveled 40 in (1.0 m) back as it absorbed the recoil of the blast. This was too long for the Sherman's turret. [8] Kilbourn solved this problem by redesigning the recoil system completely rather than modifying it.
The 17 pdr SP Achilles was basically a modified M10, the principal difference being the gun. The main armament of the Achilles was the Ordnance QF 17-pounder, a substantially more powerful gun than the 3 inch (76.2 mm) M7 mounted on the standard M10. The single top-mounted .50 inch (12.7 mm) M2 Browning heavy machine gun was retained.
In the lead up to D-Day, Sherman tanks were fitted with the 17 pounder, creating the interim 17 pounder Sherman Firefly. Converting Sherman tanks was simpler than producing Challengers, so it was decided in November 1943 to terminate the A30 production run after the two hundred vehicles had been built, allowing BRC&W to concentrate on the Cromwell.
The turret is removed with the turret ring sealed, and the front of the vehicle is fitted with mine rollers. M728 CEV – M60A1-based combat engineer vehicle fitted with a folding A-frame crane and winch attached to the front of the turret, and an M135 165 mm demolition gun. Commonly fitted with the D7 bulldozer blade, or a mine-clearing equipment.
The projectile fired was the same, however due to the shorter barrel of the 77mm HV, muzzle velocity was somewhat less than the 17 pdr. The normal 17 pdr could not be fitted into a vehicle with a turret ring of the Cromwell's or Comet's diameter as the breech was too long. It would have hit the turret ring during recoil when fired at some ...
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The self-propelled 17-pdr, Valentine, Mk I, Archer was a British tank destroyer [2] of the Second World War based on the Valentine infantry tank chassis fitted with an Ordnance QF 17 pounder gun. Designed and manufactured by Vickers-Armstrongs , 655 were produced between March 1943 and May 1945.