Design
The hull machine gun was removed to provide stowage space for the long 17pdr cartridges. It was expected this larger ammunition, together with its stowage forward, would require two loaders and hence a larger turret. To accommodate the large weapon and a second loader, a turret larger than that of the Cromwell was required and the hull had to be lengthened; and an extra road wheel added. This change in length, without a corresponding change in width across the tracks, reduced mobility compared to the Cromwell.
In order to keep the weight under control, compromises had to be made and armouring was reduced. It was not possible to reduce hull armour, so it was reduced on the turret - 63 mm on the front and 40 mm on the side compared to 75 mm and 60 mm on the Cromwell. As the base of the turret was unprotected, a jacking feature was fitted to clear any jam resulting from enemy action.
The first Challenger was completed in 1942. When the second was tested at Lulworth, it was criticized that, although it would be effective at long range against the current best-gunned tank in German service (the Panzer IV "Special" with the long 75 mm gun), at shorter ranges it would be at a disadvantage due to slow firing rate and thin armour. An order for 200 was placed in February 1943. In November of that year it was announced that no more would be ordered.
Read more about this topic: Cruiser Mk VIII Challenger
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